The world's largest library of professional chess videos by proven masters and educators
Now with 3207 incredible videos​...​and counting!
 
 
Chess Lecture Guide to the ECO Codes
A00 Anderssen's Opening 1.a3

A00 Polish Gambit, Anderssen's Opening 1.a3 a5 2.b4

A00 Creepy Crawly Formation 1.a3 e5 2.h3 d5

A00 Andersspike 1.a3 g6 2.g4

A00 Ware; Meadow Hay; Crab 1.a4

A00 Wing Gambit, Ware Opening 1.a4 b5

A00 Cologne Gambit, Ware Opening 1.a4 b6 2.d4 d5 2.Nc3 Nd7

A00 Ware Gambit 1.a4 e5 2.a5 d5 3.e3 f5 4.a6

A00 Polish; Orangutan; Sokolsky; Hunt 1.b4

A00 Birmingham Gambit, Polish 1.b4 c5

A00 Outflank Variation, Polish 1.b4 c6

A00 Schuhler Gambit, Polish 1.b4 c6 2.Bb2 a5 3.b5 cxb5 4.e4

A00 Myers Variation, Polish 1.b4 d5 2.Bb2 c6 3.a4

A00 Bugayev Attack, Polish 1.b4 e5 2.a3

A00 Wolferts Gambit, Polish 1.b4 e5 2.Bb2 c5

A00 Schiffler-Sokolsky; Tartakower Gambit 1.b4 e5 2.Bb2 f6 3.e4 Bxb4

A00 Brinckmann Variation, Polish 1.b4 e5 2.Bb2 f6 3.e4 Bxb4 4.Bc4 Nc6 5.f4 Qe7 6.f5 g6

A00 Bucker Defense, Polish 1.b4 Na6

A00 Grigorian Variation, Polish 1.b4 Nc6

A00 Polish Spike 1.b4 Nf6 2.Bb2 g6 3.g4

A00 Karniewski; Tubingen Variation, Polish 1.b4 Nh6

A00 Saragossa; Hempel's Opening 1.c3

A00 Hanham; Hayward 1.c3 e5 2.Qc2

A00 Mieses; Valencia; Venezuelan Opening 1.d3

A00 Venezolana 1.d3 c5 2.Nc3 Nc6 3.g3

A00 Reversed Rat 1.d3 e5

A00 Spike Deferred; Myers Spike Attack 1.d3 g6 2.g4

A00 Keoni-Hiva Gambit 1.e3 d5 2.Nc3 Nf6 3.a3 e5 4.f4 exf4 5.Nf3

A00 Van't Kruijs Opening 1.e3 e5

A00 Bouncing Bishop Variation 1.e3 e5 2.Bc4 b5 3.Bb3

A00 Amsterdam Attack 1.e3 e5 2.c4 d6 3.Nc3 Nc6 4.b3 Nf6

A00 Ekolu Variation 1.e3 e5 2.Nc3 d5 3.f4 exf4 4.Nf3

A00 Alua Variation 1.e3 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3

A00 Akahi Variation 1.e3 e5 2.Nc3 Nf6 3.f4 exf4 4.Nf3

A00 Barnes; Gedult-Gunderam; Walkerling 1.f3

A00 King's Head Opening 1.f3 e5 2.e4

A00 Hammerschlag; Pork Chop Opening 1.f3 e5 2.Kf2

A00 Benko; Barczay; Bilek; Hungarian 1.g3

A00 Gambit 59 1.g3 d5 2.Bg2 e5 3.b4

A00 Regan Variation 1.g3 d5 2.Bg2 e5 3.d4

A00 Reversed Alekhine 1.g3 e5 2.Nf3

A00 Lasker Simul Special 1.g3 h5

A00 Grob; Ahlhausen; Colibri; Fric; Genoa; Spike 1.g4

A00 Grob Gambit 1.g4 d5 2.Bg2 Bxg4

A00 Romford Counter-Gambit, Grob 1.g4 d5 2.Bg2 Bxg4 3.c4 d4

A00 Spike, Grob 1.g4 d5 2.Bg2 c6 3.g5

A00 Short Spike, Grob 1.g4 d5 2.Bg2 c6 3.h3

A00 Zilbermints Gambit, Grob 1.g4 d5 2.e4

A00 Keene Defense, Grob 1.g4 d5 2.h3 e5

A00 Hurst Attack, Grob 1.g4 e5 2.Bg2 d5 3.c4

A00 Alessi Gambit, Grob 1.g4 f5

A00 Double Grob 1.g4 g5

A00 Spike Deferred 1.g4 g6 2.d3

A00 Bucker Defense, Grob 1.g4 Nh6

A00 Clemenz Opening 1.h3

A00 Kadas Opening 1.h4

A00 Despres Opening 1.h4

A00 Koola-Koola 1.h4 a5

A00 Wulumulu 1.h4 e5 2.d4

A00 Durkin's Opening; Sodium Attack 1.Na3

A00 Dunst; Heinrichsen; Will Bull; Kotrc 1.Nc3

A00 St. George Defense, Dunst 1.Nc3 a6

A00 Novosibirsk Variation, Dunst 1.Nc3 c5 2.d4 cxd4 3.Qxd4 Nc6 4.Qh4

A00 Twyble Attack, Dunst 1.Nc3 c5 2.Rb1

A00 Dunst Gambit 1.Nc3 d5 2.e4 dxe4 3.d3

A00 Pseudo-Diemer Gambit, Dunst 1.Nc3 d5 2.e4 dxe4 3.f3 exf3 4.Qxf3

A00 Amazon, Dunst 1.Nc3 d5 2.e4 dxe4 3.Nxe4 Qd5

A00 Reversed Nimzovich 1.Nc3 e5

A00 Battambang, Dunst 1.Nc3 e5 2.a3

A00 Irish Attack; Polish Attack 1.Nc3 e5 2.f4

A00 Napoleon Attack, Dunst 1.Nc3 e5 2.Nf3

A00 Glasscoe Gambit, Dunst 1.Nc3 f5 2.g4

A00 Anti-Pirc Variation, Dunst 1.Nc3 g6 2.h4

A00 Tubingen Gambit, Dunst 1.Nc3 Nf6 2.g4

A00 Amar; Paris Opening 1.Nh3

A00 Drunken Knight Opening 1.Nh3

A00 Krazy Kat 1.Nh3 e5 2.f3 d5 3.Nf2

A01 Larsen; Queen's Fianchetto; Nimzo-Larsen Attack 1.b3

A01 Symmetrical Variation, Larsen 1.b3 b6

A01 English Variation, Larsen 1.b3 c5

A01 Classical Variation, Larsen 1.b3 d5

A01 Modern Variation, Larsen 1.b3 e5

A01 Ringelbach Gambit, Larsen 1.b3 e5 2.Bb2 f5 3.e4

A01 Paschmann Gambit, Larsen 1.b3 e5 2.Bb2 Nc6 3.f4

A01 Dutch Variation, Larsen 1.b3 f5

A01 Indian Variation, Larsen 1.b3 Nf6

A01 Spike Variation, Larsen 1.b3 Nf6 2.Bb2 g6 3.g4

A02 Bird's Opening; Dutch Attack 1.f4

A02 From's Gambit, Bird 1.f4 e5

A02 Canard Formation; Double Duck 1.f4 f5 2.d4 d5

A02 Pawn Thrust Attack, Bird 1.f4 f5 2.d4 d5

A02 Swiss Gambit, Bird 1.f4 f5 2.e4 fxe4 3.Nc3 Nf6 4.g4

A02 Hobbs Gambit, Bird 1.f4 g5

A02 Batavo Polish Attack, Bird 1.f4 Nf6 2.Nf3 g6 3.b4

A03 A03 1.f4 d5

A03 Sturm; Mujannah 1.f4 d5 2.c4

A03 Prokofiev Gambit, Bird 1.f4 d5 2.e4 dxe4 3.d3

A03 Williams Gambit, Bird 1.f4 d5 2.e4 dxe4 3.Nc3

A03 Horsefly Defense, Bird 1.f4 Nh6

A04 Reti; Zukertort; A04 1.Nf3

A04 Wade Defense 1.Nf3 d6

A04 Lisitsin Gambit; Polish Gambit 1.Nf3 f5 2.e4

A04 Rydel-Bloodgood Gambit 1.Nf3 f5 2.e4 exf4 3.Ne5

A04 Polish G; Dalesio G; Pirc-Lisitsin G 1.Nf3 f5 2.e4 fxe4 3.Ng5

A04 Herrstrom Gambit, Reti 1.Nf3 g5

A04 Oberndorfer Gambit; Reti 1.Nf3 g5

A04 Lessing Defense 1.Nf3 Nc6

A05 King's Indian Attack; Reti; Zukertort; A05 1.Nf3 Nf6

A06 A06 1.Nf3 d5

A06 Nimzovich Opening, Reti 1.Nf3 d5 2.b3

A06 Bloodgood Gambit, Reti 1.Nf3 d5 2.b3 c5 3.e4 dxe4 4.Ne5

A06 Santasiere's Folly, Reti 1.Nf3 d5 2.b4

A06 Old Indian Attack 1.Nf3 d5 2.d3

A06 Tennison G; Lemberg G; Abonyi G 1.Nf3 d5 2.e4

A06 Reversed Mexican Defense, Reti 1.Nf3 d5 2.Nc3

A06 Ampel Variation, Reti 1.Nf3 d5 2.Rg1

A06 Improved Lisitsin G, Reti 1.Nf3 f5 2.d3

A07 Barcza Opening, Reti; A07 1.Nf3 d5 2.g3

A08 A08 1.Nf3 d5 2.g3 c5

A09 Reti; Landstrasser G; Wolf G; A09 1.Nf3 d5 2.c4

A09 London V; New York V, Reti 1.Nf3 d5 2.c4 c6 3.b3 Nf6 4.Bg2 e6 5.Bb2 Nbd7

A09 Benoni Reversed; Wing Blumenfeld 1.Nf3 d5 2.c4 d4

A09 Reti Polonaise 1.Nf3 d5 2.c4 d4 3.b4

A09 Penguin Variation, Reti 1.Nf3 d5 2.c4 d4 3.Rg1

A09 Reti Gambit Accepted 1.Nf3 d5 2.c4 dxc4

A09 Neo-Catalan, Reti 1.Nf3 d5 2.c4 e6 3.g3

A10 English Opening; A10 1.c4

A10 Halibut Gambit, English 1.c4 b5

A10 Anglo Scandinavian Defense, English 1.c4 d5

A10 Loehn Gambit, English 1.c4 d5 2.cxd5 e6

A10 Schulz Gambit, English 1.c4 d5 2.cxd5 Nf6

A10 Malvinas Variation, English 1.c4 d5 2.cxd5 Qxd5 3.Nc3 Qa5

A10 Anglo-Dutch Defense 1.c4 f5

A10 Anglo-Polish Dutch 1.c4 f5 2.b4

A10 Hickmann Gambit, English 1.c4 f5 2.e4

A10 Hickmann Gambit, English 1.c4 f5 2.e4 fxe4 3.d3

A10 Porcupine Variation, English 1.c4 f5 2.e4 fxe4 3.Nc3 Nf6 4.g4

A10 Wade Gambit, English 1.c4 f5 2.g4

A10 English Spike 1.c4 f5 2.g4

A10 Chabanon Gambit, English 1.c4 f5 2.Nf3 d6 3.e4

A10 Myers Defense, English 1.c4 g5 2.d4 Bg7

A10 Zilbermints Gambit, English 1.c4 g5 2.d4 e5

A10 Great Snake, English 1.c4 g6

A10 Adorjan System, English 1.c4 g6 2.e4 e5

A10 Beefeater 1.c4 g6 2.Nc3 Bg7 3.d4 c5 4.d5 Bxc3 5.bxc3 f5

A10 Anglo-Lithuanian Variation, English 1.c4 Nc6

A11 Anglo-Slav, English; A11 1.c4 c6

A12 A12 1.c4 c6 2.Nf3 d5 3.b3

A12 Bled Variation, English 1.c4 c6 2.Nf3 d5 3.b3 Nf6 4.g3 g6

A13 Agincourt; Kurajica Defense, English; A13 1.c4 e6

A13 English Defense 1.c4 e6 2.d4 b6

A13 King's Knight Variation, English 1.c4 e6 2.Nf3 d5

A13 Wimpy System, English 1.c4 e6 2.Nf3 d5 3.b3 Nf6 4.Bb2 c5 e3

A13 Afincourt Variation, English 1.c4 e6 2.Nf3 d5 3.g3

A13 Kurajica Defense, English 1.c4 e6 2.Nf3 d5 3.g3 c6

A13 Neo Catalan, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6

A13 Neo Catalan Accepted, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 dxc4

A13 Romanishin Gambit, English 1.c4 e6 2.Nf3 Nf6 3.g3 a6 4.Bg2 b5

A14 A14 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7

A14 Neo Catalan Declined, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O

A14 Keres Defense, English 1.c4 e6 2.Nf3 d5 3.g3 Nf6 4.Bg2 Be7 5.O-O c5 6.cxd5 Nxd5 7.Nc3 Nc6

A15 Anglo System, English; A15 1.c4 Nf6

A15 Mikenas-Carls Variation, English 1.c4 Nf6

A15 English Orangutan 1.c4 Nf6 2.b4

A15 Shirazi Shove 1.c4 Nf6 2.g3 h5

A15 King's Knight Variation, English 1.c4 Nf6 2.Nf3

A15 Romanishin Variation, English 1.c4 Nf6 2.Nf3 e6 3.g3 a6

A16 A16 1.c4 Nf6 2.Nc3

A16 Golombek Defense, English; Anti English 1.c4 Nf6 2.Nc3 d5

A16 Czech Variation, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nb6

A16 Korchnoi's Variation, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.g3 Bg7 6.Bg2 e5

A16 Stein Attack, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.Nf3 g6 5.Qa4+

A16 Anti-anti-Gruenfeld 1.c4 Nf6 2.Nc3 g6 3.Nf3 Bg7 4.e4

A17 Smyslov Defense, English 1.c4 Nf6 2.Nc3 d5 3.cxd5 Nxd5 4.g3 g6 5.Bg2 Nxc3

A17 Hegehog System, Anglo-Indian English; A17 1.c4 Nf6 2.Nc3 e6

A17 Nimzo-English Opening 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4

A17 Zviagintsev-Krasenkov Attack, English 1.c4 Nf6 2.Nc3 e6 3.Nf3 Bb4 4.g4

A18 Flohr-Mikenas-Carls Variation, English; A18 1.c4 Nf6 2.Nc3 e6 3.e4

A18 Kevitz Defense, English 1.c4 Nf6 2.Nc3 e6 3.e4 Nc6

A18 Queen's Indian Formation, English 1.c4 Nf6 2.Nc3 e6 3.Nf3 b6

A19 Floh-Mikenas-Carls Variation, English; A19 1.c4 Nf6 2.Nc3 e6 3.e4 c5

A19 Nei Gambit, English 1.c4 Nf6 2.Nc3 e6 3.e4 c5 4.e5 Ng8

A20 King's English; A20 1.c4 e5

A20 Kahiko-Hula Gambit, English 1.c4 e5 2.e3 Nf6 4.f4 exf4 4.Nf3

A20 Double Whammy, English 1.c4 e5 2.f4

A20 Drill Variation, English 1.c4 e5 2.g3 h5

A20 Nimzovich Variation, English 1.c4 e5 2.Nf3

A20 Nimzovich-Flohr Variation, English 1.c4 e5 2.Nf3 e4

A20 English Queen 1.c4 e5 2.Qa4

A21 Reversed Sicilian, English; A21 1.c4 e5 2.Nc3

A21 Kramnik-Shirov Variation, English 1.c4 e5 2.Nc3 Bb4

A21 Troger Variation, English 1.c4 e5 2.Nc3 d6 3.g3 Be6 4.Bg2 Nc6

A21 Keres Defense, English 1.c4 e5 2.Nc3 d6 3.g3 c6

A21 General Variation, King's English 1.c4 e5 2.Nc3 d6 3.Nf3

A21 Smyslov Variation, English 1.c4 e5 2.Nc3 d6 3.Nf3 Bg4

A21 Anglo-Dutch 1.c4 e5 2.Nc3 f5

A22 Two Knights Variation, English; A22 1.c4 e5 2.Nc3 Nf6

A22 Mazedonisch Variation, English 1.c4 e5 2.Nc3 Nf6 3.f4

A22 Bremen; Carls Variation, English 1.c4 e5 2.Nc3 Nf6 3.g3

A22 Kapengut; Smyslov; Modern V, English 1.c4 e5 2.Nc3 Nf6 3.g3 Bb4

A22 Bellon Gambit, English 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 b5

A22 Erbenheimer Gambit, English 1.c4 e5 2.Nc3 Nf6 3.Nf3 e4 4.Ng5 Ng4

A23 Keres Variation, English; A23 1.c4 e5 2.Nc3 Nf6 3.g3 c6

A23 Reversed Dragon, English 1.c4 e5 2.Nc3 Nf6 3.g3 d5

A24 Fianchetto Lines, Two Knights Variation, English 1.c4 e5 2.Nc3 Nf6 3.g3 g6

A24 Prickly Pawn Pass System, English 1.c4 e5 2.Nc3 Nf6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4 O-O 7.Nge2 c6 8.O-O a6

A25 Reversed Closed Sicilian, English; A25 1.c4 e5 2.Nc3 Nc6

A25 Troger Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Be6

A25 Taimanov Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7

A25 Hungarian Attack, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 4.Rb1

A25 Closed System, Full Symmetry, King's English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6

A25 Botvinnik System, King's English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.e4

A25 Bremen-Hort Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 d6 6.Nge2 Be6

A25 Botvinnik Variation, English 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4

A26 Closed System, King's English; A26 1.c4 e5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3

A27 Three Knights System, English; A27 1.c4 e5 2.Nc3 Nc6 3.Nf3

A28 Four Knights Variation, English; A28 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6

A28 Korchnoi Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.a3

A28 Flexible Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d3

A28 Bradley Beach Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 e4

A28 Four Knights Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.d4 exd4 5.Nxd4Bb4 6.Bg5 h6 7.Bh4 Bxc3+ 8.bxc3 Ne5

A28 Quiet Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3

A28 Romanishin Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 Bxc3

A28 Keene; Stean Variation, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e3 Bb4 5.Qc2 O-O 6.Nd5 Re8 7.Qf5

A28 Botvinnik Line, English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.e4

A29 Fianchetto Line, Four Knights English 1.c4 e5 2.Nc3 Nc6 3.Nf3 Nf6 4.g3

A30 Symmetrical Defense, English; A30 1.c4 c5

A30 Wing Variation, English 1.c4 c5 2.b4

A30 Napolitano Gambit, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.b4

A30 Hedgehog Variation, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O e6 6.Nc3 Be7

A30 Double Fianchetto Defense, English 1.c4 c5 2.Nf3 Nf6 3.g3 b6 4.Bg2 Bb7 5.O-O g6

A31 Anti-Benoni Variation, Symmetrical English; A31 1.c4 c5 2.Nf3 Nf6 3.d4

A31 Two Knights Variation, English 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4

A32 Spielmann Defense, Symmetrical English; A32 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6

A33 A33 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6

A33 Geller Variation, Symmetrical English 1.c4 c5 2.Nf3 Nf6 3.d4 cxd4 4.Nxd4 e6 5.Nc3 Nc6 6.g3 Qb6

A34 Normal Variation, Symmetrical English; A34 1.c4 c5 2.Nc3

A34 Fianchetto Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.g3

A34 Rubinstein Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.g3 d5 4.cxd5 Nxd5 5.Bg2 Nc7

A34 Asymmetrical Variation, English 1.c4 c5 2.Nc3 Nf6 3.Nf3 d5 4.cxd5 Nxd5

A34 Keres-Parma System, English 1.c4 c5 2.Nc3 Nf6 3.Nf3 e6 4.g3 Nc6

A34 Four Knights Variation, Symmetrical English 1.c4 c5 2.Nc3 Nf6 3.Nf3 Nf6

A35 Two Knights Variation, Symmetrical English; A35 1.c4 c5 2.Nc3 Nc6

A36 Fianchetto Variation, Symmetrical English; A36 1.c4 c5 2.Nc3 Nc6 3.g3

A36 Symmetrical Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7

A36 Botvinnik System Reversed, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e3 e5

A36 Botvinnik Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.e4

A37 Two Knights Line, Symmetrical English; A37 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3

A38 Full Symmetry Line, Symmetrical English; A38 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6

A38 Double Fianchetto, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.b3

A38 Duchamp Variation, Symmetrical English 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d3

A39 Mecking Variation, Symmetrical English; A39 1.c4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.Nf3 Nf6 6.O-O O-O 7.d4

A40 Hartlaub Gambit, English 1.c4 b6 2.d4 Bb7 3.Nc3 e6 4.e4 f5 5.exf5 Nf6

A40 Queen Pawn Opening; A40 1.d4

A40 St George's Gambit 1.d4 a6 2.c4 b5 3.e4 e6 4.cxb5 axb5

A40 Polish Defense 1.d4 b5

A40 Spassky Gambit, Polish Defense 1.d4 b5 2.e4 Bb7 3.Bxb5

A40 Queen Fianchetto, Queen Pawn Game 1.d4 b6

A40 Eastbourne Gambit 1.d4 b6 2.c4 Bb7 3.Bxb5

A40 Charlick Gambit; Englund Gambit 1.d4 e5

A40 Englund Gambit Declined 1.d4 e5 2.d5

A40 Diemer Counterattack 1.d4 e5 2.d5 Bc5 3.e4 Qh4

A40 Thuring Gambit; Hartlaub-Charlick Gambit 1.d4 e5 2.dxe5 d6

A40 Soller; Purchas Gambit 1.d4 e5 2.dxe5 f6

A40 Englund; Behting Gambit 1.d4 e5 2.dxe5 Nc6

A40 Felbecker Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Bc5

A40 Soller Gambit Deferred 1.d4 e5 2.dxe5 Nc6 3.Nf3 f6

A40 Zilbermints Gambit II, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 h6

A40 Zilbermints Gambit, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Nge7

A40 Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7

A40 Stockhom Variation, Englund Gambit 1.d4 e5 2.dxe5 Nc6 3.Nf3 Qe7 4.Qd5

A40 Mosquito Gambit, Englund 1.d4 e5 2.dxe5 Qh4

A40 Horwitz Defense 1.d4 e6

A40 Franco-Indian Defense 1.d4 e6

A40 Seneschaud Variation, Dutch 1.d4 e6 2.Bf4 f5 3.g4

A40 English Defense 1.d4 e6 2.c4 b6

A40 Perrin Variation 1.d4 e6 2.c4 b6 3.e4 Bb7 4.Bd3 Nc6

A40 Poli Gambit 1.d4 e6 2.c4 b6 3.e4 Bb7 4.f3 f5 5.exf5 Nh6

A40 Hartlaub Gambit Declined 1.d4 e6 2.c4 b6 3.Nc3 Bb7 4.e4 f5 5.d5

A40 Hartlaub Gambit Accepted 1.d4 e6 2.c4 b6 3.Nc3 Bb7 4.e4 f5 5.exf5 Nf6

A40 Keres Defense, Indian; Kangaroo Defense 1.d4 e6 2.c4 Bb4+

A40 Transpositional Variation, Keres Defense 1.d4 e6 2.c4 Bb4+ 3.Nc3

A40 Zilbermints Gambit 1.d4 e6 2.c4 e5

A40 Borg Gambit 1.d4 g5

A40 Queen Pawn Fianchetto 1.d4 g6

A40 Kotov-Robatsch Defense 1.d4 g6 2.c4 Bg7

A40 Pseudo-Saemisch 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Be3 Nf6 5.f3

A40 Rossolimo Variation 1.d4 g6 2.c4 Bg7 3.e4 d6 4.Nf3 Bg4

A40 Neo-Modern Defense 1.d4 g6 2.c4 Bg7 3.e4 e5

A40 Beefeater Variation 1.d4 g6 2.c4 Bg7 3.Nc3 c5 4.d5 Bxc3+ 5.bxc3 f5

A40 Modern Defense 1.d4 g6 2.c4 Bg7 3.Nc3 d6

A40 Kotov Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 Nc6

A40 Lizard Defense; Pirc-Diemer Gambit 1.d4 g6 2.h4 Nf6 3.h5

A40 Bogoljubov; Mikenas-Van Geet Defense 1.d4 Nc6

A40 Lundin Defense 1.d4 Nc6

A40 Lithuanian Variation, Mikenas 1.d4 Nc6 2.c4 e5 3.d5 Nce7

A40 Cannstatter Variation, Mikenas 1.d4 Nc6 2.c4 e5 3.d5 Nd4

A40 Pozarek Gambit 1.d4 Nc6 2.c4 e5 3.dxe5 Nxe5 4.Nc3 Nxc4

A40 Montevideo Defense 1.d4 Nc6 2.d5 Nb8

A40 Zaire Defense 1.d4 Nc6 2.d5 Nb8 3.e4 Nf6 5.e5 Ng8

A40 Polish Variation 1.e4 g6 2.d4 Bg7 3.c4 c5 4.Nf3 Qb6

A40 Dunworth Variation, Modern Defense 1.e4 g6 2.d4 Bg7 3.c4 d5 4.exd5 c6 5.dxc6 Bxd4

A41 Anglo-Slav Opening 1.d4 c6 2.c4 d6

A41 Pillsbury Defense; A41; Rat Defense 1.d4 d6

A41 Wade Defense 1.d4 d6 2.Nf3 Bg4

A41 Averbakh Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4

A41 Pterodactyl Variation, Modern 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 c5 5.Nf3 Qa5

A42 A42 1.d4 d6 2.c4

A42 English Rat 1.d4 d6 2.c4 e5

A42 Lisbon Gambit 1.d4 d6 2.c4 e5 3.dxe5 Nc6

A42 Randspringer Variation 1.d4 g6 2.c4 Bg7 3.Nc3 d6 4.e4 f5

A43 Staunton Defense; Benoni C-G; A43 1.d4 c5

A43 Zilbermints Gambit; Nakamura Gambit, Benoni 1.d4 c5 2.b4 cxb4

A43 Old Benoni 1.d4 c5 2.d5 d6

A43 Schmid Variation, Benoni 1.d4 c5 2.d5 d6 3.Nc3 g6

A43 Franco-Benoni; Franco-Sicilian 1.d4 c5 2.d5 e6 3.e4

A43 Clarendon Court Variation, Benoni 1.d4 c5 2.d5 f5

A43 Benoni-Staunton Gambit 1.d4 c5 2.d5 f5 3.e4

A43 Snail Variation, Benoni 1.d4 c5 2.d5 Na6

A43 Benoni-Indian Defense 1.d4 c5 2.d5 Nf6

A43 Woozle Defense, Benoni 1.d4 c5 2.d5 Nf6 3.Nc3 Qa5

A43 Kingside move order, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3

A43 Habichd; Hawk Variation, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3 c4

A43 Hawk Variation, Benoni 1.d4 c5 2.d5 Nf6 3.Nf3 e4

A43 Benoni Gambit Accepted 1.d4 c5 2.dxc5

A43 Cormorant Gambit, Benoni 1.d4 c5 2.dxc5 b6

A43 Schlenker Defense, Benoni 1.d4 c5 2.dxc5 Na6

A43 Zilbermints-Benoni Gambit 1.d4 c5 2.Nf3 cxd4 3.b4

A43 Tamarkin Countergambit, Benoni 1.d4 c5 2.Nf3 cxd4 3.b4 e5

A43 Franco-Sicilian Hybrid 1.d4 e6 2.c4 c5 3.d5 exd5 4.cxd5 d6 5.Nc3 g6 6.e4 Bg7 7.Nf3 Ne7

A44 Pawn Thrust, Benoni; A44 1.d4 c5 2.d5 e5

A44 Blockade Variation; Semi-Benoni; Russian Variation 1.d4 c5 2.d5 e5 3.e4 d6

A45 Indian Defense; A45 1.d4 Nf6

A45 Basque Opening 1.d4 Nf6 2.b3

A45 Trompowski; Opocensky; Ruth Opening 1.d4 Nf6 2.Bg5

A45 Poisoned Pawn Variation, Trompowski 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3

A45 Chepukaitis Gambit 1.d4 Nf6 2.Bg5 c5 3.d5 Qb6 4.Nc3 Qxb2 5.Bd2 Qb6

A45 Borg Variation, Trompowski 1.d4 Nf6 2.Bg5 Ne4 3.Bf4 g5

A45 Edge Variation, Trompowski 1.d4 Nf6 2.Bg5 Ne4 3.Bh4

A45 Hergert Gambit #2, Trompowski 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 c6 4.Nd2 Qa5 5.c3 Nxd2 6.Qxd2 d5 7.e4

A45 Hergert Gambit #1, Trompowski 1.d4 Nf6 2.Bg5 Ne4 3.Bh4 d5 4.f3 Nf6 5.Nc3 Bf5 6.e4

A45 Raptor Variation, Trompowski 1.d4 Nf6 2.Bg5 Ne4 3.h4

A45 Hergert Gambit, Trompowski 1.d4 Nf6 2.Bg5 Ne4 3.h4 Nxg5 4.hxg5 e5

A45 Pawn Push Variation 1.d4 Nf6 2.d5

A45 Omega Gambit 1.d4 Nf6 2.e4

A45 Arafat Gambit 1.d4 Nf6 2.e4 Nxe4 3.Bd3 Nf6 4.Bg5

A45 Paleface Attack 1.d4 Nf6 2.f3

A45 Webster Gambit 1.d4 Nf6 2.f3 c5 3.d5 e6 4.e4 exd5 5.e5

A45 Blackmar-Diemer Gambit Deferred 1.d4 Nf6 2.f3 d5 3.e4

A45 Kraus-Muhlherr Counter Gambit 1.d4 Nf6 2.f3 d5 3.e4 e5 4.dxe5 Nxe4

A45 Gedult Attack 1.d4 Nf6 2.f3 d5 3.g4

A45 Gedult-Gunderam System 1.d4 Nf6 2.f3 d5 3.g4

A45 Linder Counter Gambit 1.d4 Nf6 2.f3 e6 3.e4 Nxe4

A45 Canard Attack 1.d4 Nf6 2.f4

A45 Ueberlinger Gambit 1.d4 Nf6 2.g3 e5

A45 Bullfrog; Weidenhagen; Krabbe; Ochsenfrosch 1.d4 Nf6 2.g4

A45 Bronstein Gambit 1.d4 Nf6 2.g4

A45 Oshima Defense 1.d4 Nf6 2.g4 e5

A45 Gibbins-Wiedehagen Gambit Accepted 1.d4 Nf6 2.g4 Nxg4

A45 Stummer Gambit 1.d4 Nf6 2.g4 Nxg4 3.e4 d6 4.Be2 Nf6 5.Nc3

A45 Maltese Falcon 1.d4 Nf6 2.g4 Nxg4 3.f3 Nf6 4.e4

A45 Reversed Chigorin Defense 1.d4 Nf6 2.Nc3 c5

A45 Von Beivorseen 1.d4 Nf6 2.Nc3 c5 3.dxc5

A45 Malich Gambit 1.d4 Nf6 2.Nc3 d5 3.Bg5 c5 4.Bxf6 gxf6 5.e4 dxe4 6.d5

A45 Huebsch Gambit 1.d4 Nf6 2.Nc3 d5 3.e4 Nxe4

A45 Maddigan Gambit 1.d4 Nf6 2.Nc3 e5

A45 Lazard Gambit; Maddigan Gambit 1.d4 Nf6 2.Nd2 e5

A46 Knights Variation, Indian Game; A46 1.d4 Nf6 2.Nf3

A46 Polish Defense 1.d4 Nf6 2.Nf3 b5

A46 Spielmann-Indian 1.d4 Nf6 2.Nf3 c5

A46 Pseudo-Benko Gambit 1.d4 Nf6 2.Nf3 c5 3.d5 b5

A46 Czech-Indian 1.d4 Nf6 2.Nf3 c6

A46 London System 1.d4 Nf6 2.Nf3 e6 3.Bf4

A46 Torre Attack 1.d4 Nf6 2.Nf3 e6 3.Bg5

A46 Petrosian Gambit 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e3 b6 5.d5

A46 Swiss; Wagner Gambit 1.d4 Nf6 2.Nf3 e6 3.Bg5 c5 4.e4

A46 Nimzovich Variation, Torre Attack 1.d4 Nf6 2.Nf3 e6 3.Bg5 h6

A46 Yusupov-Rubinstein System 1.d4 Nf6 2.Nf3 e6 3.e3

A46 Dory Defense 1.d4 Nf6 2.Nf3 Ne4

A47 Capablanca Variation, Indian Game; A47 1.d4 Nf6 2.Nf3 b6

A47 Torre Attack 1.d4 Nf6 2.Nf3 b6 3.Bg5

A47 Schnepper Gambit 1.d4 Nf6 2.Nf3 b6 3.c3 e5

A47 Marienbad Variation 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5

A47 Berg Variation 1.d4 Nf6 2.Nf3 b6 3.g3 Bb7 4.Bg2 c5 5.c4 cxd4 6.Qxd4

A48 Pseudo-King's Indian Variation; A48 1.d4 Nf6 2.Nf3 g6

A48 London System, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bf4

A48 London Variation 1.d4 Nf6 2.Nf3 g6 3.Bf4 Bg7 4.Nbd2

A48 Fianchetto Defense, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bg5

A48 Euwe Variation, Torre Attack 1.d4 Nf6 2.Nf3 g6 3.Bg5 Bg7 4.Nbd2 c5

A48 King's Indian Variation 1.d4 Nf6 2.Nf3 g6 3.e3 Bg7 4.Bd3 d6

A49 Przepiorka Variation; A49 1.d4 Nf6 2.Nf3 g6 3.g3

A50 Normal Variation, Indian Game; A50 1.d4 Nf6 2.c4

A50 Pyrenees Gambit 1.d4 Nf6 2.c4 b5

A50 Queen's Indian Defense; Saemisch-Indian 1.d4 Nf6 2.c4 b6

A50 Medusa Gambit 1.d4 Nf6 2.c4 g5

A50 Van Geet; Kevitz; Trajkovic; Mexican 1.d4 Nf6 2.c4 Nc6

A50 Horsefly Gambit 1.d4 Nf6 2.c4 Nc6 3.d5 Ne5 4.f4

A51 Budapest Defense; A51 1.d4 Nf6 2.c4 e5

A51 Fajarowicz Variation, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4

A51 Bonsdorf Variation, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.a3 b6

A51 Steiner Variation, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ne4 4.Qc2

A52 Normal Variation, Budapest; A52 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4

A52 Rubinstein Variation, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4

A52 Kornl Richter Gambit, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Bf4 Nc6 5.Nf3 Bb4+ 6.Nc3 Bxc3+

A52 Center Play Variation, Budapest; Alekhine Variation 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4

A52 Balogh; Tartakower C-G, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 d6

A52 Barmina Gambit, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 Nxe5 5.f4 Bc5

A52 Wikstrom Gambit, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 Nxe5 5.f4 Nbc6

A52 Abonyi Variation, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.e4 Nxe5 5.f4 Nec6

A52 Adler Variation, Budapest 1.d4 Nf6 2.c4 e5 3.dxe5 Ng4 4.Nf3

A53 Old Indian Defense; Chigorin Indian Defense; A53 1.d4 Nf6 2.c4 d6

A53 Aged Gibbon Gambit 1.d4 Nf6 2.c4 d6 3.g4

A53 Janowski Variation, Old Indian 1.d4 Nf6 2.c4 d6 3.Nc3 Bf5

A53 Grinberg Gambit, Old Indian 1.d4 Nf6 2.c4 d6 3.Nc3 Bf5 4.e4

A53 Ukranian Variation 1.d4 Nf6 2.c4 d6 3.Nc3 e5

A53 Duz-Khotimirsky Variation 1.d4 Nf6 2.c4 d6 3.Nc3 Nbd7 4.e3 e5 5.Bd3

A53 Tartakower-Indian 1.d4 Nf6 2.c4 d6 3.Nf3 Bg4

A54 Two Knights Variation, Old Indian; A54 1.d4 Nf6 2.c4 d6 3.Nc3 e5 4.Nf3

A55 Normal Variation, Old Indian; A55 1.d4 Nf6 2.c4 d6 3.Nc3 e5 4.Nf3 Nbd7 5.e4

A56 Vulture Defense, Benoni 1.d4 c5 2.d5 Nf6 3.c4 Ne4

A56 Hromadka Defense; Loose Gambit: A56 1.d4 Nf6 2.c4 c5

A56 Hromadka System, Benoni 1.d4 Nf6 2.c4 c5 3.d5 d6

A56 Lundin; Bronstein Counter-Gambit 1.d4 Nf6 2.c4 c5 3.d5 d6 4.Nc3 g6 5.e4 b5

A56 Petrosian System; Czech Benoni Defense 1.d4 Nf6 2.c4 c5 3.d5 e5

A56 Czech Variation, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 Be7

A56 King's Indian System, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e5 4.Nc3 d6 5.e4 g6

A56 Vulture Variation; Der Geier 1.d4 Nf6 2.c4 c5 3.d5 Ne4

A56 Weenink Variation, Benoni 1.d4 Nf6 2.c4 c5 3.dxc5 e6

A57 Benko Gambit; Volga; Opocensky; Vaitonis; A57 1.d4 Nf6 2.c4 c5 3.d5 b5

A57 Sosonko Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.a4

A57 Bishop Attack, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Bg5

A57 Benko Gambit Accepted 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5

A57 Pawn Return Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.b6

A57 Central Storming Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.f4

A57 Modern Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.e3

A57 Dlugy Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.f3

A57 Zaitsev System, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3

A57 Nescafe Frappe Attack, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3 axb5 6.e4 b4 7.Nb5

A57 Zaitsev Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.Nc3 axb5 6.e4 b4 7.Nb5 d6 8.Nf3 g6 9.Bc4

A57 Benko Gambit Declined; Hjoerring Countergambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.e4

A57 Pseudo-Saemisch, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.f3

A57 Mutkin Countergambit, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.g4

A57 Quiet Line, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nd2

A57 Main Line, Benko Gambit Declined 1.d4 Nf6 2.c4 c5 3.d5 b5 4.Nf3

A58 Fully Accepted Variation, Benko Gambit; A58 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6

A58 Fianchetto Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 g6 7.Nf3 d6 8.g3 Bg7 9.Bg2

A59 A59 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.e4

A59 King Walk Variation, Benko Gambit 1.d4 Nf6 2.c4 c5 3.d5 b5 4.cxb5 a6 5.bxa6 Bxa6 6.Nc3 d6 7.e4 Bxf1 8.Kxf1 g6 9.g3 Bg7 10.Kg2 O-O

A60 Tal Variation, Modern Variation, Benoni; A60 1.d4 Nf6 2.c4 c5 3.d5 e6

A60 Modern Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6

A61 A61 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3

A61 Snake Variation, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 Bd6

A61 Penrose Variation, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.Bd3

A61 Uhlmann Variation, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.Bg5

A61 Nimzovich Variation, Knight's Tour Variation, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.Nd2

A62 A62 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3

A62 Fianchetto Variation, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2

A62 Hastings Defense, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2 O-O 9.O-O Nbd7

A63 A63 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2 O-O 9.O-O a6

A64 A64 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.Nf3 g6 7.g3 Bg7 8.Bg2 O-O 9.O-O a6 10.a4 Nbd7 11.Nd2

A65 King Pawn lines, Benoni; A65 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4

A66 Pawn Storm Variation, Benoni; A66 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4

A66 Mikenas V, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.e5

A67 Taimanov Variation, Benoni; A67 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Bb5

A68 A68 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3

A68 Four Pawns Attack, Benoni 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 O-O

A69 A69 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.f4 Bg7 8.Nf3 O-O 9.Be2 Re8

A70 Classical Variation, Benoni; A70 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3

A71 A71 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Bg5

A72 A72 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2

A73 A73 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O

A74 A74 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O a6

A75 Argentine Attack, Benoni; A75 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O a6 10.a4 Bg4

A76 Czerniak Defesne, Benoni; A76 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8

A77 A77 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2

A78 A78 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6

A79 A79 1.d4 Nf6 2.c4 c5 3.d5 e6 4.Nc3 exd5 5.cxd5 d6 6.e4 g6 7.Nf3 Bg7 8.Be2 O-O 9.O-O Re8 10.Nd2 Na6 11.f3

A80 Dutch Defense; A80 1.d4 f5

A80 Seneschaud Gambit, Dutch 1.d4 f5 2.Bf4 e6 3.g4

A80 Hopton Attack, Dutch 1.d4 f5 2.Bg5

A80 Blackmar's Second Gambit, Dutch 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.f3

A80 Lisbon Gambit, Dutch; Krejcik Gambit 1.d4 f5 2.g4

A80 Hevendehl Gambit, Dutch 1.d4 f5 2.g4 e5

A80 Tate Gambit, Dutch 1.d4 f5 2.g4 fxg4 3.e4 d5 4.Nc3

A80 Korchnoi's Variation, Dutch 1.d4 f5 2.h3

A80 Janzen-Korchnoi Gambit, Dutch 1.d4 f5 2.h3 Nf6 3.g4

A80 Raphael Variation, Dutch 1.d4 f5 2.Nc3

A80 Kingfisher Gambit, Dutch 1.d4 f5 2.Nc3 d5 3.e4

A80 Spielmann Gambit, Dutch 1.d4 f5 2.Nc3 Nf6 3.g4

A80 Barcza Variation, Dutch 1.d4 f5 2.Nf3 Nf6 3.c3

A80 Alapin; Ulvestad; Manhattan; Kmoch Variation, Dutch 1.d4 f5 2.Qd3

A80 Anti-Stonewall, Dutch 1.d4 f5 2.Qd3 d5 3.g4

A80 Anti-Modern, Dutch 1.d4 f5 2.Qd3 d6 3.g4

A80 Anti-Classical Line, Dutch 1.d4 f5 2.Qd3 e6 3.g4

A80 Anti-Leningrad Variation, Dutch 1.d4 f5 2.Qd3 g6 3.g4

A80 Manhattan Gambit, Dutch 1.d4 f5 2.Qd3 Nf6 3.g4

A80 Pretzel Gambit, Dutch 1.d4 f5 2.Qd3 Nf6 3.g4

A81 Dutch Indian; Leningrad Variation, Dutch; A81 1.d4 f5 2.g3

A81 Basman Variation, Dutch 1.d4 f5 2.g3 g6 3.Bg2 Bg7 4.Nf3 c6 5.O-O Nh6

A81 Carlsbad Variation, Dutch 1.d4 f5 2.g3 g6 3.Bg2 Bg7 4.Nh3

A81 Antoshin-Hort Variation, Dutch 1.d4 f5 2.g3 Nf6 3.Bg2 d6

A81 Ilyin-Genevsky Variation, Dutch 1.d4 f5 2.g3 Nf6 3.Bg2 e6 4.Nf3 Be7 5.O-O O-O 6.c4 d6

A81 Blackburne Variation, Dutch 1.d4 f5 2.g3 Nf6 3.Bg2 e6 4.Nh3

A81 Semi-Leningrad Variation, Dutch 1.d4 f5 2.g3 Nf6 3.Bg2 g6

A82 Staunton Gambit, Dutch; A82 1.d4 f5 2.e4

A82 Balogh Defense, Dutch 1.d4 f5 2.e4 d6

A82 Staunton Gambit Accepted, Dutch 1.d4 f5 2.e4 fxe4

A82 Tartakower Variation, Dutch 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.g4

A82 American Gambit, Dutch 1.d4 f5 2.e4 fxe4 3.Nd2

A83 General Variation, Staunton Gambit, Dutch; A83 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5

A83 Nimzovich Variation, Dutch 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 b6

A83 Chigorin Variation, Dutch 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 c6

A83 Lasker Variation, Dutch 1.d4 f5 2.e4 fxe4 3.Nc3 Nf6 4.Bg5 g6 5.f3

A84 Slav Stonewall, Dutch 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5

A84 Bellon Gambit 1.d4 e6 2.c4 f5 3.e4

A84 A84 1.d4 f5 2.c4

A84 Classical Variation, Dutch 1.d4 f5 2.c4 e6

A84 Bellon Gambit, Dutch 1.d4 f5 2.c4 e6 3.e4

A84 Rubinstein Variation, Dutch 1.d4 f5 2.c4 e6 3.Nc3

A84 Stonewall Variation, Dutch 1.d4 f5 2.c4 e6 3.Nc3 Nf6 4.g3 c6 5.Bg2 d5 6.O-O Bd6

A84 Queen's Knight Variation, Dutch 1.d4 f5 2.c4 Nf6 3.Nc3

A84 Krause Variation, Dutch 1.d4 f5 2.c4 Nf6 3.Nc3 d6 4.Nf3 Nc6

A85   1.d4 f5 2.c4 g6 3.Nc3

A85 Bladel Variation, Dutch 1.d4 f5 2.c4 g6 3.Nc3 Nh6

A85 Normal Variation, Dutch 1.d4 f5 2.c4 Nf6

A85 Ozol Variation, Dutch 1.d4 f5 2.c4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Bg5

A86 Fianchetto Variation, Dutch; A86 1.d4 f5 2.c4 Nf6 3.g3

A86 Leningrad Variation, Dutch 1.d4 f5 2.c4 Nf6 3.g3 g6

A87 A87 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3

A87 Fluid Formation, Dutch 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6

A88 Warsaw Variation, Dutch; A88 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6 7.Nc3 c6

A89 Matulovic Variation, Dutch; A89 1.d4 f5 2.c4 Nf6 3.g3 g6 4.Bg2 Bg7 5.Nf3 O-O 6.O-O d6 7.Nc3 Nc6

A90 A90 1.d4 f5 2.c4 Nf6 3.g3 e6

A90 Classical Variation, Dutch 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2

A90 Nimzo-Dutch Variation 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Bb4+

A91 A91 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7

A91 Botvinnik-Bronstein Variation, Dutch 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nc3 O-O 6.e3

A91 Blackburne Attack, Dutch 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Bg7 5.Nh3

A92 A92 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3

A92 Alekhine Variation, Dutch 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O Ne4

A93 Botvinnik Variation, Dutch; A93 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.b3

A94 A94 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.b3 c6

A95 A95 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d5 7.Nc3

A96 A96 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6

A97 Ilyin-Zhenevsky Variation, Dutch; A97 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8

A98 A98 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8 8.Qc2

A99 A99 1.d4 f5 2.c4 Nf6 3.g3 e6 4.Bg2 Be7 5.Nf3 O-O 6.O-O d6 7.Nc3 Qe8 8.b3

B00 Ware Defense 1.e4 a5

B00 Corn Stalks 1.e4 a5

B00 Snagkeouss Defense 1.e4 a5 2.d4 Nc6

B00 St George; Birmingham; Baker 1.e4 a6

B00 San Jorge Variation 1.e4 a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 d6 5.O-O g6 6.c3 Bg7

B00 Polish Variation, St George Defense 1.e4 a6 2.d4 b5 3.Nf3 Bb7 4.Bd3 e6

B00 Zilbermints Gambit, St George Defense 1.e4 a6 2.d4 e5

B00 San Jorge Variation 1.e4 a6 2.d4 e6

B00 Three Pawn Attack, St George 1.e4 a6 2.d4 e6 3.c4

B00 Sanky-Georg Gambit, St George 1.e4 a6 2.d4 e6 3.c4 b5

B00 Woodchuck Variation, St George 1.e4 a6 2.d4 Nc6

B00 Owen's Defense; Greek Defense 1.e4 b6

B00 Guatemalan Defense 1.e4 b6 2.d4 Ba6

B00 Matovinsky Gambit 1.e4 b6 2.d4 Bb7 3.Bd3 f5

B00 Matovinsky Gambit 1.e4 b6 2.d4 Bb7 3.Bd3 f5 4.exf5 Bxg2 5.Qh5+ g6

B00 Naselwaus Variation, Owen's Defense 1.e4 b6 2.d4 Bb7 3.Bg5

B00 Wind Gambit, Owen Defense 1.e4 b6 2.d4 Bb7 3.f3 e5

B00 Smith Gambit, Owen Defense 1.e4 b6 2.d4 Bb7 3.Nf3

B00 Hekili-Loa Gambit, Owen Defense 1.e4 b6 2.d4 c5 3.dxc5 Nc6

B00 Mao Tse Tung; Duras 1.e4 f5

B00 Fred; From Reversed 1.e4 f5

B00 Tiers Counter-Gambit 1.e4 f5

B00 Barnes Defense 1.e4 f6

B00 Basman Defense; Macho Grob 1.e4 g5

B00 Basman; Macho Grob; Borg 1.e4 g5

B00 Borg Gambit 1.e4 g5 2.d4 Bg7

B00 Zilbermints Gambit, Borg 1.e4 g5 2.d4 e5

B00 Borg Defense; Troon Gambit 1.e4 g5 2.d4 h6 3.h4 g4

B00 Pickering (Goldsmith) Defense 1.e4 h5

B00 Picklepuss Defense 1.e4 h5 2.d4 Nf6

B00 Carr Defense 1.e4 h6

B00 Zilbermints Gambit, Carr Defense 1.e4 h6 2.d4 e5

B00 Lemming Defense 1.e4 Na6

B00 Nimzovich Defense 1.e4 Nc6

B00 Wheeler Gambit, Nimzovich Defense 1.e4 Nc6 2.b4 Nxb4 3.c3 Nc6 4.d4

B00 Pseudo-Spanish Variation 1.e4 Nc6 2.Bb5

B00 Scandinavian Variation, Nimzovich Defense 1.e4 Nc6 2.d4 d5

B00 Hornung Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.Be3

B00 Aachen Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.exd5 Nb4

B00 Marshall Gambit, Nimzovich 1.e4 Nc6 2.d4 d5 3.exd5 Qxd5 4.Nc3

B00 Bogoljubow Variation, Nizovich Defense 1.e4 Nc6 2.d4 d5 3.Nc3

B00 Brandics Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.Nc3 a6

B00 Richter Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.Nc3 dxe4 4.d5 Nb8 5.f3

B00 Nimzovich Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.Nc3 dxe4 4.d5 Ne5

B00 Alekseev Variation, Nimzovich; Heinola-Deppe Gambit 1.e4 Nc6 2.d4 d5 3.Nc3 e5

B00 Erben Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.Nc3 g6

B00 Vehre Variation, Nimzovich Defense 1.e4 Nc6 2.d4 d5 3.Nc3 Nf6

B00 Mikenas Variation, Nimzovich Defense 1.e4 Nc6 2.d4 d6

B00 Kennedy Variation, Nimzovich 1.e4 Nc6 2.d4 e5

B00 Linksspringer Variation, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.d5

B00 Bileefelder Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 Bc5

B00 Burgar Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 d6

B00 Hammer Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 f6

B00 Riemann Defense, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.f4 Nc6

B00 Keres Attack, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.Nc3

B00 Paulsen Attack, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 Nxe5 4.Nf3

B00 Herford Gambit, Nimzovich Defense 1.e4 Nc6 2.d4 e5 3.dxe5 Qh4

B00 French Connection, Nimzovich Defense 1.e4 Nc6 2.d4 e6

B00 Neo-Mongoloid Defense, Nimzovich 1.e4 Nc6 2.d4 f6

B00 Pirc Connection, Nimzovich Defense 1.e4 Nc6 2.d4 g6

B00 Breyer Defense, Nimzovich 1.e4 Nc6 2.Nc3 Nf6

B00 Williams Variation, Nimzovich 1.e4 Nc6 2.Nf3 d6

B00 Franco-Nimzovich Variation 1.e4 Nc6 2.Nf3 e6

B00 Colorado Defense, Nimzovich; Lean Variation 1.e4 Nc6 2.Nf3 f5

B00 Colorado Counter Accepted, Nimzovich Defense 1.e4 Nc6 2.Nf3 f5 3.exf5

B00 El Columpio Defense, Nimzovich Defense 1.e4 Nc6 2.Nf3 Nf6 3.e5 Ng4

B00 Adams Defense 1.e4 Nh6

B00 Wild Bull Defense 1.e4 Nh6

B01 Center Counter; Scandinavian; B01 1.e4 d5

B01 Zilbermints Gambit, Center Counter 1.e4 d5 2.b4

B01 Blackbunre-Kloosterboer Gambit, Center Counter 1.e4 d5 2.exd5 c6 3.dxc6 e5

B01 Atkinson (Kloosterboer) Variation, Center Counter 1.e4 d5 2.exd5 c6 3.dxc6 e5

B01 Blackburne Gambit, Center Counter 1.e4 d5 2.exd5 c6 3.dxc6 Nxc6

B01 Boehnke Gambit, Center Counter 1.e4 d5 2.exd5 e5

B01 Boehnke Gambit Accepted, Center Counter 1.e4 d5 2.exd5 e5 3.dxe6 Bxe6

B01 Marshall Gambit, Center Counter; Modern Variation 1.e4 d5 2.exd5 Nf6

B01 Panov Transfer, Center Counter 1.e4 d5 2.exd5 Nf6 3.c4 c6

B01 Icelandic-Palme Gambit, Center Counter 1.e4 d5 2.exd5 Nf6 3.c4 e6

B01 Portuguese Variation, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Bg4

B01 Portuguese Gambit, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Bg4 4.f3 Bf5 5.Bb5+ Nbd7

B01 Kadas Gambit, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 c6 4.dxc6 e5

B01 Wing Gambit, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 g6 4.c4 b5

B01 Marshall Variation, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Nxd5

B01 Kiel Variation, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Nxd5 4.c4 Nb4

B01 Tomalty Gambit, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Nxd5 4.c4 Nf6 5.Nc3 c5

B01 Gipslis Variation, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Nxd5 4.Nf3 Bg4

B01 Richter Variation, Center Counter 1.e4 d5 2.exd5 Nf6 3.d4 Nxd5 4.Nf3 g6

B01 Mieses-Kotroc Variation, Center Counter 1.e4 d5 2.exd5 Qxd5

B01 Leonhardt (Rosen) Gambit, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.b4

B01 Anderssen Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 e5

B01 Collijn Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 e5 5.Nf3 Bg4

B01 Mieses Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6

B01 Gruenfeld Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bf5 6.Ne5 c6 7.g4

B01 Lasker Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qa5 4.d4 Nf6 5.Nf3 Bg4 6.h3

B01 Gubinsky-Melts Defense, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qd6

B01 Schiller-Pytel Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qd6 4.d4 c6

B01 Bronstein Variation, Center Counter 1.e4 d5 2.exd5 Qxd5 3.Nc3 Qd6 4.d4 Nf6 5.Nf3 a6

B01 Closed Scandivian 1.e4 d5 2.Nc3

B02 Alekhine's Defense; B02 1.e4 Nf6

B02 Krejcik Variation, Alekhine 1.e4 Nf6 2.Bc4

B02 Fried Fox, Alekhine; Krejcik Gambit 1.e4 Nf6 2.Bc4 Nxe4 3.Bxf7+

B02 Maroczy Variation, Alekhine 1.e4 Nf6 2.d3

B02 Welling Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.b3

B02 Kmoch Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.Bc4 Nb6 4.Bb3 c5 5.d3

B02 Hunt Gambit, Alekhine; Two Pawn Attack 1.e4 Nf6 2.e5 Nd5 3.c4

B02 Steiner Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.b3

B02 Lasker Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.c5

B02 Mikenas Gambit, Alekhine 1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.c5 Nd5 5.Bc4 e6 6.Nc3 d6 7.Nxd5 exd5 8.Bxd5

B02 Matsukevich Gambit, Alekhine 1.e4 Nf6 2.e5 Nd5 3.c4 Nb6 4.c5 Nd5 5.Nc3 Nxc3 6.dxc3 d6 7.Bg5

B02 Buntin Gambit, Alekhine 1.e4 Nf6 2.e5 Nd5 3.e6

B02 Buckley Attack, Alekhine 1.e4 Nf6 2.e5 Nd5 3.Na3

B02 Saemisch Attack, Alekhine 1.e4 Nf6 2.e5 Nd5 3.Nc3

B02 Mokele Mbembe; Knight's Tour 1.e4 Nf6 2.e5 Ne4

B02 Retreat; Brooklyn Variation, Alekhine 1.e4 Nf6 2.e5 Ng8

B02 Everglades Defense, Alekhine 1.e4 Nf6 2.e5 Ng8 3.d4 f5

B02 Scandinavian Variation, Alekhine 1.e4 Nf6 2.Nc3 d5

B02 Myers Gambit, Alekhine 1.e4 Nf6 2.Nc3 d5 3.d3 dxe4 4.Bg5

B02 Spielmann Variation, Alekhine 1.e4 Nf6 2.Nc3 d5 3.e5 Nfd7 4.e6

B02 Noch Gambit, Alekhine 1.e4 Nf6 2.Nc3 d5 3.exd5

B02 Geschev Gambit, Alekhine 1.e4 Nf6 2.Nc3 d5 3.exd5 c6

B02 John Tracy Gambit, Alekhine 1.e4 Nf6 2.Nf3

B03 B03 1.e4 Nf6 2.e5 Nd5 3.d4

B03 Wall Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 c5

B03 Balogh Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Bc4

B03 Hunt Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.c5

B03 Four Pawns Attack; Chase V 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4

B03 Trifunovic Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 Bf5

B03 Cambridge Gambit, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.c4 Nb6 5.f4 g5

B04 B04 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3

B04 Panov Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 5.h3

B04 Larsen Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 dxe5

B04 Alburt Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 g6

B04 Keres Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 g6 5.Bc4 Nb6 6.Bb3 Bg7 7.a4

B04 Karpov Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 g6 5.c4 Nb6 6.h3 Bg7 8.Be2

B04 Schmid Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Nb6

B05 B05 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4

B05 Flohr Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 5.Be2 c6

B05 Alekhine Variation, Alekhine 1.e4 Nf6 2.e5 Nd5 3.d4 d6 4.Nf3 Bg4 5.c4

B06 Pirc; Robatsch; Modern; King Pawn Fianchetto 1.e4 g6

B06 Monkey's Bum, Pirc 1.e4 g6 2.Bc4 Bg7 3.Qf3 e6 4.d4

B06 Bishop Attack 1.e4 g6 2.d4 Bg7 3.Bc4

B06 Buecker Gambit 1.e4 g6 2.d4 Bg7 3.Bc4 b5

B06 Westermann Gambit 1.e4 g6 2.d4 Bg7 3.Bd2

B06 Wind Gambit 1.e4 g6 2.d4 Bg7 3.Bd3

B06 Three Pawns Attack 1.e4 g6 2.d4 Bg7 3.f4

B06 Pterodactyl, Pirc 1.e4 g6 2.d4 Bg7 3.Nc3 c5

B06 Gurgenidze Defense, Modern Defense 1.e4 g6 2.d4 Bg7 3.Nc3 c6 4.f4 d5 5.e5 h5

B06 Mittenberger Gambit, Modern Defense 1.e4 g6 2.d4 Bg7 3.Nc3 d5

B06 Anti-Modern 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Bc4 c6 5.Qe2

B06 Pseudo-Austrian Attack 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.f4

B06 Two Knight Variation, Modern Defense 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Nf3

B06 Suttles Variation, Modern Defense 1.e4 g6 2.d4 Bg7 3.Nc3 d6 4.Nf3 c6

B06 Mongredien Defense, Pirc 1.e4 g6 2.d4 Bg7 3.Nf3 b6

B06 Geller's System, Modern Defense 1.e4 g6 2.d4 Bg7 3.Nf3 d6 3.c3

B06 Rossolimo Variation, Modern Defense 1.e4 g6 2.d4 Bg7 3.Nf3 d6 3.c4 Bg4

B06 Accelerated Gurgenidze 1.e4 g6 2.d4 Bg7 3.Nf3 d6 3.Nc3 c6

B06 Small Center Variation, Pirc 1.e4 g6 2.d4 Bg7 3.Nf3 d6 3.Nc3 e6

B06 Fianchetto Gambit, Modern Defense 1.e4 g6 2.d4 f5

B06 Norwegian Defense 1.e4 g6 2.d4 Nf6

B06 Masur Gambit 1.e4 g6 2.d4 Nh6 3.Nc3 f5 4.Bxh6 Bxh6 5.exf5 O-O

B07 B07 1.e4 d6

B07 Maroczy Defense, Pirc 1.e4 d6 2.d4 e5

B07 Philidor Gambit, Pirc 1.e4 d6 2.d4 e5 3.dxe5 Bd7

B07 Small Center Defense 1.e4 d6 2.d4 e6

B07 Balogh Defense, Pirc 1.e4 d6 2.d4 f5

B07 Pirc Defense 1.e4 d6 2.d4 Nf6

B07 Lion's Jaw, Pirc 1.e4 d6 2.d4 Nf6 3.f3

B07 Czech Defense 1.e4 d6 2.d4 Nf6 3.Nc3 c6

B07 Pirc; Ufimtsev; Antal Defense 1.e4 d6 2.d4 Nf6 3.Nc3 g6

B07 Kholmov System, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Bc4

B07 Classical System, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2

B07 Chinese Variation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2 Bg7 5.g4

B07 Bayonet Attack, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2 Bg7 5.h4

B07 Sveshnikov-Jansa Attack, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.h3

B07 150 Attack 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be3 c6 5.Qd2

B07 Panov; Opatijav; Byrne Variation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Bg5

B07 Anti-Philidor 1.e4 d6 2.d4 Nf6 3.Nc3 Nbd7 4.f4

B07 Roscher Gambit, Pirc 1.e4 d6 2.d4 Nf6 3.Nf3

B08 B08 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3

B08 Two Knights System, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7

B08 Quiet System, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2

B08 Parma Defense, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 O-O 6.O-O Bg4

B08 Czech Defense, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 O-O 6.O-O c6

B08 Chigorin Line, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.Be2 O-O 6.O-O Nc6

B08 Schlechter Variation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Nf3 Bg7 5.h3

B09 Austrian Attack, Pirc; B09 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4

B09 Ljubojevic Variation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Bc4

B09 Austrian; Yugoslav Defense, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3

B09 Dragon Formation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 c5

B09 Weiss Variation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.Bd3

B09 Kurajica Variation, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.Be3

B09 Unzicker Attack, Pirc 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.f4 Bg7 5.Nf3 O-O 6.e5

B10 Caro-Kann Defense; B10 1.e4 c6

B10 Hillbilly Attack, Caro-Kann 1.e4 c6 2.Bc4

B10 Anti Caro-Kann; Accelerated Panov 1.e4 c6 2.c4

B10 Breyer Variation, Caro-Kann 1.e4 c6 2.d3

B10 Stein Attack, Caro-Kann 1.e4 c6 2.d3 d5 3.Nd2 g6 4.g3 Bg7 5.Bg2 e5 6.Ngf3 Ne7 7.O-O O-O 8.b4

B10 Massachussets Defense, Caro-Kann 1.e4 c6 2.d4 f5

B10 Masi Variation, Caro-Kann 1.e4 c6 2.d4 Nf6

B10 Scorpion-Horus Gambit, Caro-Kann 1.e4 c6 2.Nc3 d5 3.d3 dxe4 4.Bg5

B10 Goldman Variation, Caro 1.e4 c6 2.Nc3 d5 3.Qf3

B10 Two Knights Variation, Caro 1.e4 c6 2.Nf3 d5 3.Nc3

B11 B11 1.e4 c6 2.Nc3

B11 Two Knights Attack, Caro Kann 1.e4 c6 2.Nc3 d5 3.Nf3

B11 Mindeno Variation, Caro-Kann 1.e4 c6 2.Nc3 d5 3.Nf3 Bg4

B11 Retreat Line, Mindeno Variation, Caro-Kann 1.e4 c6 2.Nc3 d5 3.Nf3 Bg4 4.h3 Bh5

B12 B12 1.e4 c6 2.d4

B12 Landau Gambit, Caro-Kann 1.e4 c6 2.d4 d5 3.Bd3 Nf6 4.e5 Nfd7 6.e6

B12 Mieses Gambit, Caro 1.e4 c6 2.d4 d5 3.Be3

B12 Diemer-Duhm Gambit, Caro 1.e4 c6 2.d4 d5 3.c4

B12 Advance Variation, Caro 1.e4 c6 2.d4 d5 3.e5

B12 Prins Attack, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 Bf5 4.b4

B12 Bayonet Variation, Caro 1.e4 c6 2.d4 d5 3.e5 Bf5 4.g4

B12 Tal Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 Bf5 4.h4

B12 Van der Wiel Attack, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3

B12 Dreyev Defense, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nc3 Qb6

B12 Bronstein Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Ne2

B12 Short Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 Bf5 4.Nf3

B12 Botvinnik-Carls Defense, Caro-Kann 1.e4 c6 2.d4 d5 3.e5 c5

B12 Maroczy Variation, Caro 1.e4 c6 2.d4 d5 3.f3

B12 Fantasy; Lilienfisch Variation, Caro 1.e4 c6 2.d4 d5 3.f3

B12 Maroczy Gambit, Caro-Kann 1.e4 c6 2.d4 d5 3.f3 dxe4 4.fxe4 e5 5.Nf3 exd4 6.Bc4

B12 Modern Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.Nd2

B12 New Caro-Kann 1.e4 c6 2.d4 d5 3.Nd2 g6

B12 Edinburgh Variation, Caro 1.e4 c6 2.d4 d5 3.Nd2 Qb6

B12 Ulysses Gambit, Caro 1.e4 c6 2.d4 d5 3.Nf3 dxe4 4.Ng5

B12 De Bruycker Defense, Caro 1.e4 c6 2.d4 Na6

B12 Hector Gambit, Caro 1.e4 c6 2.Nc3 d5 3.Nf3 dxe4 4.Ng5

B13 Exchange Variation, Caro; B13 1.e4 c6 2.d4 d5 3.exd5

B13 Rubinstein Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.exd5 cxd3 4.Bd3 Nc6 5.c3 Nf6 6.Bf4

B13 Panov-Botvinnik; Gunderam Attack 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4

B14 B14 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3

B14 Carlsbad Line, Caro-Kann 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 e6

B14 Czerniak Line, Caro-Kann 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 Qa5

B14 Reifir-Spielmann Line, Caro-Kann 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.c4 Nf6 5.Nc3 Nc6 6.Bg5 Qb6

B15 B15 1.e4 c6 2.d4 d5 3.Nc3

B15 Gurgenidze Variation, Caro 1.e4 c6 2.d4 d5 3.Nc3 b5

B15 Von Hennig Gambit, Caro 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Bc4

B15 Milner-Barry Gambit, Caro; Rasa-Studier Gambit 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.f3

B15 Knight Variation, Caro 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6

B15 Tarrasch (Alekhine) Gambit, Caro 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Bd3

B15 Tartakower Variation, Caro 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ exf6

B15 Forgacs Variation, Caro Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ exf6 6.Bc4

B15 Gurgenidze System, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 g6

B15 Gurgenidze Variation, Caro 1.e4 c6 2.d4 d5 3.Nc3 g6 4.e5 Bg7 5.f4 h5

B15 Campomanes Attack, Caro 1.e4 c6 2.d4 d5 3.Nc3 Nf6

B16 Finnish Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 h6

B16 Nimzovich; Bronstein-Larsen, Caro; B16 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nf6 5.Nxf6+ gxf6

B17 Karpov Variation, Caro-Kann; B17 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7

B17 Smyslov Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Bc4 Ngf6 6.Ng5 e6 7.Qe2 Nb6

B17 Tiviakov-Fischer Attack, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Bc4 Ngf6 6.Nxf6+ Nxf6

B17 Kasparov Attack, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Ng3

B17 Ivanchuk Defense, Caro Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Ng5 Ndf6

B18 Classical Variation, Caro; B18 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5

B18 Flohr Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.Nh3

B19 B19 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3

B19 Seirawan Variation, Caro-Kann 1.e4 c6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Bf5 5.Ng3 Bg6 6.h4 h6 7.Nf3 Nd7 8.e5 Bh7 9.Bd3 Bxd3 10.Qxd3

B20 Sicilian Defense; B20 1.e4 c5

B20 Mengarini Gambit, Sicilian 1.e4 c5 2.a3

B20 Mengarini Gambit, Sicilian 1.e4 c5 2.a3 Nc6 3.b4

B20 Snyder Variation, Sicilian 1.e4 c5 2.b3

B20 Queen Fianchetto Variation, Sicilian 1.e4 c5 2.b3 b6

B20 Wing Gambit, Sicilian 1.e4 c5 2.b4

B20 Marshall Variation, Sicilian 1.e4 c5 2.b4 cxb4 3.a3

B20 Wing; Carlsbad Variation, Sicilian 1.e4 c5 2.b4 cxb4 3.a3 bxa3

B20 Marienbad Variation, Sicilian 1.e4 c5 2.b4 cxb4 3.a3 d5 4.exd5 Qxd5 5.Bb2

B20 Abrahams Variation, Sicilian Wing Gambit 1.e4 c5 2.b4 cxb4 3.Bb2

B20 Santasiere Wing Gambit, Sicilian 1.e4 c5 2.b4 cxb4 3.c4

B20 Bowlder Attack, Sicilian 1.e4 c5 2.Bc4

B20 Slow Sicilian 1.e4 c5 2.Be2

B20 Staunton-Cochrane Variation, Sicilian 1.e4 c5 2.c4

B20 Gloria Variation, Sicilian 1.e4 c5 2.c4 d6 3.Nc3 Nc6 4.g3 h5

B20 Chameleon Variation, Sicilian 1.e4 c5 2.d3

B20 Big Clamp Variation, Sicilian 1.e4 c5 2.d3 Nc6 3.c3 d6 4.f4

B20 Sicilian Center Game 1.e4 c5 2.d4 cxd4

B20 Smith-Morra; Fleissig Gambit, Sic 1.e4 c5 2.d4 cxd4 3.c3

B20 Rivadavia Gambit, Sicilian 1.e4 c5 2.d4 cxd4 3.c3

B20 Push Variation, Smith-Morra Gambit, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 d3

B20 Dubois Variation, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 d3 4.c4

B20 Scandinavian Formation, Smith-Morra, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 d5

B20 Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3

B20 Chicago Defense, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 d6 5.Bc4 e6 6.Nf3 Nf6 7.O-O a6

B20 Taimanov Formation, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 e6 5.Bc4 a6 6.Nf3 Ne7

B20 Kan Formation, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 e6 5.Nf3 a6

B20 Fianchetto Defense, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 e6 5.Nf3 g6

B20 Classical Formation, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 d6 6.Bc4 a6 7.O-O Nf6

B20 Scheveningen Formation, Smith-Morra Accepted 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 d6 6.Bc4 e6

B20 Paulsen Formation, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 a6

B20 Morphy Defense Deferred, Smith-Morra Accepted 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 a6 7.O-O b5 8.Bb3 Bc5

B20 Larsen Defense, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 a6 7.O-O Qc7 8.Qe2 Bd6

B20 Pin Defense, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Bb4

B20 Morphy Defense, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 Bc5

B20 Sozin Formation, Smith-Morra Accepted, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 dxc3 4.Nxc3 Nc6 5.Nf3 e6 6.Bc4 d6 7.O-O a6 8.Qe2 b5

B20 Center Formation, Smith-Morra Declined, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 e5

B20 Alapin Formation, Smith-Morra Declined, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 Nf6

B20 Wing Formation, Smith-Morra Declined, Sicilian 1.e4 c5 2.d4 cxd4 3.c3 Qa5

B20 Halasz Gambit, Sicilian 1.e4 c5 2.d4 cxd4 3.f4

B20 Morphy Gambit, Sicilian 1.e4 c5 2.d4 cxd4 3.Nf3

B20 Andreaschek Gambit, Sicilian 1.e4 c5 2.d4 cxd4 3.Nf3 e5 4.c3

B20 Steinitz; Tartakower, Lasker-Dunne Variation, Sicilian 1.e4 c5 2.g3

B20 Myers Attack, Sicilian 1.e4 c5 2.h4

B20 King David's Opening 1.e4 c5 2.Ke2

B20 Keres; Billium Attack, Sicilian; Chameleon 1.e4 c5 2.Ne2

B20 Brick Variation, Sicilian 1.e4 c5 2.Nh3

B21 Grand Prix (Larsen-Santasiere) Attack 1.e4 c5 2.f4

B21 Tal Gambit, Sicilian 1.e4 c5 2.f4 d5 3.exd5 Nf6

B22 Alapin; Sveshnikov Var, Sicilian; B22 1.e4 c5 2.c3

B22 Barmen Defense, Sicilian 1.e4 c5 2.c3 d5 3.exd5 Qxd5

B22 Sherzer Variation, Sicilian 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.d4 e6 5.Nf3 Nc6

B22 Stoltz Attack, Sicilian 1.e4 c5 2.c3 Nf6 3.e5 Nd5 4.Nf3 Nc6 5.Bc4 Nb6 6.Bb3

B23 Closed; Chigorin Variation, Sicilian; B23 1.e4 c5 2.Nc3

B23 Grand Prix Variation, Sicilian 1.e4 c5 2.Nc3 d6 3.f4

B23 Marshall Gambit, Sicilian 1.e4 c5 2.Nc3 e6 3.d4 d5

B23 Korchnoi Defense, Sicilian 1.e4 c5 2.Nc3 e6 3.g3 d5

B23 Traditional Closed Sicilian 1.e4 c5 2.Nc3 Nc6

B23 Portland Attack, Sicilian 1.e4 c5 2.Nc3 Nc6 3.d3 g6 4.g4

B23 Vinken System, Sicilian; Grand Prix Attack 1.e4 c5 2.Nc3 Nc6 3.f4

B23 Schofman Variation, Sicilian 1.e4 c5 2.Nc3 Nc6 3.f4 g6 4.Nf3 Bg7 5.Bc4 e6 6.f5

B23 Chameleon Sicilian 1.e4 c5 2.Nc3 Nc6 3.Nge2

B24 Fianchetto Variation, Sicilian Closed; B24 1.e4 c5 2.Nc3 Nc6 3.g3

B25 B25 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6

B25 Botvinnik Defense, Sicilian Closed 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4 e5

B25 Edge Variation, Sicilian Closed 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.f4 e5 7.Nh3 Nge7

B26 B26 1.e4 c5 2.Nc3 Nc6 3.g3 g6 4.Bg2 Bg7 5.d3 d6 6.Be3

B27 B27 1.e4 c5 2.Nf3

B27 Polish Gambit, Sicilian 1.e4 c5 2.Nf3 b5

B27 Katalimov Variation, Sicilian 1.e4 c5 2.Nf3 b6

B27 Jalalabad Variation, Sicilian 1.e4 c5 2.Nf3 e5

B27 Brussels Gambit, Sicilian 1.e4 c5 2.Nf3 f5

B27 Double-Dutch Gambit, Sicilian 1.e4 c5 2.Nf3 f5 3.exf5 Nh6

B27 Hyperaccelerated Dragon, Sicilian 1.e4 c5 2.Nf3 g6

B27 Action Extension, Sicilian 1.e4 c5 2.Nf3 g6 3.c4 Bh6

B27 Hyperaccelerated Pterodactyl, Sic 1.e4 c5 2.Nf3 g6 3.d4 Bg7

B27 Frederico Variation, Sicilian 1.e4 c5 2.Nf3 g6 3.d4 f5

B27 Sicilian Fred 1.e4 c5 2.Nf3 g6 3.d4 f5

B27 Buecker Variation, Sicilian 1.e4 c5 2.Nf3 h6

B27 Mongoose Variation, Sicilian 1.e4 c5 2.Nf3 Qa5

B27 Althouse; Stiletto Variation, Sicilian 1.e4 c5 2.Nf3 Qa5

B27 Accelerated Paulsen, Sicilian 1.e4 c5 2.Nf3 Qc7

B27 Quinteros Variation, Sicilian 1.e4 c5 2.Nf3 Qc7

B28 O'Kelly Variation, Sicilian; B28 1.e4 c5 2.Nf3 a6

B28 Kieseritzky System, Sicilian 1.e4 c5 2.Nf3 a6 3.b3

B28 Wing Gambit, Sicilian 1.e4 c5 2.Nf3 a6 3.b4

B28 Aronin System, Sicilian 1.e4 c5 2.Nf3 a6 3.Be2

B28 Venice System, Sicilian 1.e4 c5 2.Nf3 a6 3.c3

B28 Ljubojevic Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c3 b5

B28 Gambit Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.c3 d5 4.exd5 Nf6

B28 Steiner Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c3 d6

B28 Barcza Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c3 Nf6

B28 Maroczy Bind, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.c4

B28 Robatsch Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c4 d6

B28 Paulsen Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c4 e6

B28 Geller Line, Sicilian 1.e4 c5 2.Nf3 a6 3.c4 Nc6 4.d4 cxd4 5.Nxd4 e5

B28 Quiet System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d3

B28 Normal System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4

B28 Cortlever Gambit, Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Bc4

B28 Smith-Morra Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.c3

B28 Taimanov Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4 e5

B28 Kan Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Nxd4 e6

B28 Zagorovsky Line, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.d4 cxd4 4.Qxd4

B28 Reti System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.g3

B28 Yerevan System, O'Kelly Sicilian 1.e4 c5 2.Nf3 a6 3.Nc3

B29 Nimzovich; Rubinstein Var, Sicilian; B29 1.e4 c5 2.Nf3 Nf6

B29 Advance Variation, Sicilian 1.e4 c5 2.Nf3 Nf6 3.e5

B30 Old Sicilian 1.e4 c5 2.Nf3 Nc6

B30 Rossolimo (Nezmetdinov) Variation, Sicilian; B30 1.e4 c5 2.Nf3 Nc6 3.Bb5

B31 B31 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6

B31 Gufeld Gambit, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 e5 6.d4

B31 Lutikov Gambit, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.c3 Nf6 6.d4

B31 Gurgenidze Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 g6 4.O-O Bg7 5.Re1 e5 6.b4

B31 San Francisco Gambit, Sicilian 1.e4 c5 2.Nf3 Nc6 3.Bb5 Na5 4.b4

B32 B32 1.e4 c5 2.Nf3 Nc6 3.d4

B32 Nimzovich Variation, Sicilian; Nimzo-American Variation 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 d5

B32 Bourdonnais; Lowenthal Var, Sic 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5

B32 Kalashnikov Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 e5 5.Nb5 d6

B32 Retreat Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Nf3

B32 Godiva Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qb6

B32 Flohr Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Qc7

B33 B33 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6

B33 Four Knights Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3

B33 Lasker-Pelikan Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5

B33 Pelikan Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6

B33 Chelyabinsk Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5

B33 Sveshnikov Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 b5 9.Bxf6 gxf6 10.Nd5 f5

B33 Bird Variation, Siclian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Ndb5 d6 7.Bg5 a6 8.Na3 Be6

B34 Accelerated Dragon; Fianchetto Var; B34 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6

B35 B35 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.Nc3 Bg7 6.Be3 Nf6 7.Bc4

B36 Maroczy Bind, Sicilian; B36 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4

B36 Gurgenidze Variation, Sicilian 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Nf6 6.Nc3 Nxd4 7.Qxd4 d6

B37 B37 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7

B38 B38 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3

B39 Breyer Variation, Sicilian; B39 1.e4 c5 2.Nf3 Nc6 3.d4 cxd4 4.Nxd4 g6 5.c4 Bg7 6.Be3 Nf6 7.Nc3 Ng4

B40 French Variation, Sicilian; B40 1.e4 c5 2.Nf3 e6

B40 Wing Gambit Deferred, Sicilian 1.e4 c5 2.Nf3 e6 3.b4

B40 Kramnik Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.c4

B40 Gaw-Paw Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Qb6

B40 Kveinis Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Qb6

B41 B41 1.e4 c5 2.Nf3 e6 3.d4

B41 Accelerated Wimpy Variation, Sic 1.e4 c5 2.Nf3 e6 3.d4 cxd4

B41 Paulsen; Kan Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6

B41 Reti Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4

B41 Hedgehog Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 g6

B41 Bronstein Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.c4 Nf6 6.Nc3 Bb4 7.Bd3 Nc6

B41 Anderssen; Counterattack Var, Sic 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6

B41 Pin Variation; Sicilian CounterAttack 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4

B41 Jaffe Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.Bd3 e5

B41 Koch Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bb4 6.e5

B41 Marshall Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 d5

B42 B42 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3

B42 Polugaevsky Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 Bc5

B42 Swiss Cheese Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Bd3 g6

B43 B43 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 a6 5.Nc3

B44 Taimanov; Bastrikov, Paulsen Variation, Sicilian; B44 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6

B44 Szen Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5

B44 Gary Gambit, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nb5 d6 6.c4 Nf6 7.N1c3 a6 8.Na3 d5

B45 B45 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3

B45 Paulsen Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Nf6 6.Ndb5 Bb4

B45 American Attack, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Nf6 6.Ndb5 Bb4 7.Nd6+

B45 Four Knights Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6

B45 Cobra Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Ndb5 Bc5

B46 B46 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6

B46 Taimanov Variation, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 a6 6.Be2 Nge7

B47 Bastrikov Variation, Sicilian; B47 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7

B47 Ponomariov Gambit, Sicilian 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Ndb5 Qb8 7.Be3 a6 8.Bb6

B48 B48 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3

B49 B49 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nc6 5.Nc3 Qc7 6.Be3 a6 7.Be2

B50 Modern Variation, Sicilian; B50 1.e4 c5 2.Nf3 d6

B50 Kopec System, Sicilian 1.e4 c5 2.Nf3 d6 3.Bd3

B50 Delayed Alapin, Sicilian 1.e4 c5 2.Nf3 d6 3.c3

B50 Basman-Palatnik Gambit 1.e4 c5 2.Nf3 d6 3.c3 Nf6 4.Be2 Nc6 5.d4 cxd4 6.cxd4 Nxe4

B50 Kotov Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.g3 b5

B51 Wing Gambit Deferred, Sicilian 1.e4 c5 2.Nf3 d6 3.b4

B51 Moscow Variation, Sicilian; Canal Attack; B51 1.e4 c5 2.Nf3 d6 3.Bb5+

B51 Moscow Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.Bb5+ Nc6 4.O-O Bd7 5.c3 a6 6.Bxc6 Bxc6 7.Re1 Nf6 8.d4 Bxe4 9.Bg5

B51 Dorfman Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.Bb5+ Nc6 4.O-O Bd7 5.Qe2 g6 6.e5

B52 Main Line, Canal Attack, Sicilian; B52 1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7

B52 Bronstein (Haag) Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.Bb5+ Bd7 4.Bxd7+ Qxd7 5.O-O Nc6 6.c3 Nf6 7.d4

B53 B53 1.e4 c5 2.Nf3 d6 3.d4

B53 Tartakower Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.c3

B53 Chekhover Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4

B53 Zaitsev Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Qxd4 Nc6 5.Bb5 Qd7

B53 Lazy Knight Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 Nd7

B53 Cortlever Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 Nf6 4.dxc5 Nxe4 5.cxd6

B54 B54 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4

B55 B55 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6

B55 Ginsberg Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Bc4

B55 Moscow (Prins) Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3

B55 Venice Attack, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.f3 e5 6.Bb5+

B56 B56 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3

B56 Kupreichik Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Bd7

B56 Venice Attack, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e5 6.Bb5+

B56 Classical Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6

B56 Yates Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bd3

B56 Spielmann Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Nde2

B57 Sozin; Velimirovic Attack, Sicilian; B57 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4

B57 Anti-Sozin Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bc4 Qb6

B58 B58 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2

B58 Boleslavsky Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 e5

B58 Louma Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 e5 7.Nxc6

B58 Fianchetto Variation, Richter-Rauzer Sicilizn 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.g3

B59 B59 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Be2 e5 7.Nb3

B60 Richter-Rauzer Variation, Sicilian; B60 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5

B60 Dragon Variation, Richter-Rauzer Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 g6

B61 B61 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Qd2

B62 B62 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6

B62 Margate (Vitolins) Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Bb5

B62 Podebrady Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Nb3

B62 Exchange Variation, Richter-Rauzer Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Nxc6

B63 Rauzer Variation, Sicilian; B63 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2

B63 Ivanov Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Qb6

B64 B64 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4

B65 B65 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 Be7 8.O-O-O O-O 9.f4 Nxd4 10.Qxd4

B66 B66 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6

B67 B67 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7

B68 B68 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7 9.f4 Be7

B69 B69 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6 6.Bg5 e6 7.Qd2 a6 8.O-O-O Bd7 9.f4 Be7 10.Nf3 b5 11.Bxf6

B70 Dragon Variation, Sicilian; B70 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6

B70 Alekhine Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be2 Bg7 7.O-O O-O 8.Nb3

B70 Fianchetto Variation, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.g3

B71 Levenfish Variation, Sicilian; B71 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.f4

B72 B72 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3

B72 Nottingham Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.Nb3

B72 Amsterdam (Battery) Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.Qd2

B72 Grigoriev Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.Qd2 O-O 9.O-O-O

B73 B73 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O

B73 Zollner Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.f4 Qb6

B74 B74 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.Nb3

B74 Alekhine Line, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.Nb3 a5

B74 Maroczy Line, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.Nb3 Be6 10.f4 Na5

B74 Tartakower Line, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.Be2 Nc6 8.O-O O-O 9.Nb3 Be6 10.f4 Qc8

B75 B75 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3

B76 Yugoslav Attack, Sicilian Dragon; B76 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O

B76 Panov Variation, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.g4

B77 B77 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4

B77 Sosonko Variation, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Nd7

B77 Czerniak Variation, Sicilian Dragon 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Nxd4 10.Bxe4

B78 B78 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Bd7 10.O-O-O

B79 B79 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 g6 6.Be3 Bg7 7.f3 O-O 8.Qd2 Nc6 9.Bc4 Bd7 10.O-O-O Qa5

B80 Scheveingen Variation, Sicilian; B80 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6

B80 Vitolins Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bb5+

B80 English Attack, Scheveningen Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be3 a6 7.f3

B80 Fianchetto Variation, Scheveningen Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.g3

B81 Delayed Keres Attack, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be3 a6 7.g4

B81 Perenyi Gambit, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be3 a6 7.g4 e5 8.Nf5 g6 9.g5

B81 Keres; Panov Variation, Sicilian; B81 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.g4

B82 Matanovic Attack, Sicilian; B82 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.f4

B82 Tal Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.f4 Nc6 7.Be3 Be7 8.Qf3

B83 Scheveningen Variation, Sicilian; B83 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2

B84 Modern Paulsen, Sicilian; B84 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 a6

B85 B85 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 a6 7.O-O Be7

B85 Paulsen Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Be2 a6 7.O-O Qc7 8.f4 Nc6

B86 Fischer Attack, Sozin Attack, Sicilian; B86 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4

B87 Flank Variation, Sicilian; B87 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 a6 7.Bb3 b5

B88 Leonhardt Variation, Sicilian; B88 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 Nc6

B89 B89 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 Nc6 7.Be3

B89 Sherbakov Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 Nc6 7.Be3 Be7 8.Bb3 O-O 9.O-O Na5 10.f4 b6

B89 Velimirovic Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 e6 6.Bc4 Nc6 7.Be3 Be7 8.Qe2

B90 Najdorf Variation, Sicilian; B90 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6

B90 Lipnitzky Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bc4

B90 Byrne Variation, Sicilian; English Attack 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3

B90 Anti-English, Najdorf Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be3 Ng4

B90 Adams Attack, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.h3

B90 Freak Attack, Siicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Rg1

B91 Zagreb Variation, Sicilian; B91 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.g3

B92 Opocensky Variation, Sicilian; B92 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2

B92 Opocensky Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Be2 e5

B93 Amsterdam Variation, Sicilian; B93 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.f4

B94 B94 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5

B95 B95 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6

B96 B96 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4

B96 Polugaevsky; Accelerated Najdorf 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 b5

B96 Simagin Line, Najdorf Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 b5 8.e5 dxe5 9.fxe5 Qc7 10.Qe2

B97 Poisoned Pawn Variation, Najdorf Sicilian; B97 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6

B97 Poisoned Pawn Variation, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2

B97 Poisoned Pawn Accepted, Najdorf Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 Qxb2

B98 B98 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7

B98 Argenitne; Goteborg Var, Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 h6 9.Bh4 g5

B98 Browne Variation, Najdorf Sicilian 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 h6 9.Bh4 Qc7

B99 B99 1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Be7 8.Qf3 Qc7 9.O-O-O Nbd7

C00 Franco-Sicilian Defense 1.d4 e6 2.c4 c5

C00 French Defense; C00 1.e4 e6

C00 Reti (Horwitz) Variation, French 1.e4 e6 2.b3

C00 Papa-Ticulat Gambit, French 1.e4 e6 2.b3 d5 3.Bb2

C00 Banzai-Leong Gambit, French 1.e4 e6 2.b4

C00 Pinova Gambit 1.e4 e6 2.b4 Bxb4 3.e5

C00 Bird Invitation, French 1.e4 e6 2.Bb5

C00 Orthoschapp Variation, French 1.e4 e6 2.c4 d5 3.cxd5 exd5 4.Qb3

C00 King"s Indian Attack 1.e4 e6 2.d3

C00 Reversed Philidor, French 1.e4 e6 2.d3 d5 3.Nd2 Nf6 4.Ngf3 Nc6 5.Be2

C00 Franco-Hiva Gambit, French 1.e4 e6 2.d3 f5

C00 Alapin; Witaker Gambit, French 1.e4 e6 2.d4 d5 3.Be3

C00 Alapin-Diemer Gambit, French 1.e4 e6 2.d4 d5 3.Be3 dxe4 4.f3

C00 Diemer-Duhm Gambit, French 1.e4 e6 2.d4 d5 3.c4

C00 Steinitz Attack, French 1.e4 e6 2.e5

C00 Bourdonnais (La Bourdonnais) Variation, French 1.e4 e6 2.f4

C00 Reuter Gambit, French 1.e4 e6 2.f4 d5 3.Nf3 dxe4 4.Ng5

C00 Reti-Spielmann Attack, French 1.e4 e6 2.g3

C00 Queen's Knight, French 1.e4 e6 2.Nc3

C00 Pelikan Variation, French 1.e4 e6 2.Nc3 d5 3.f4

C00 Two Knight Variation, French 1.e4 e6 2.Nc3 d5 3.Nf3

C00 Knight Variation, French 1.e4 e6 2.Nf3

C00 Wing Gambit, French 1.e4 e6 2.Nf3 d5 3.e5 c5 4.b4

C00 Two Knights Variation, French 1.e4 e6 2.Nf3 d5 3.Nc3

C00 Chigorin Variation, French 1.e4 e6 2.Qe2

C01 C01 1.e4 e6 2.d4

C01 Baeuerle Gambit, French 1.e4 e6 2.d4 b5

C01 Schlechter Variation, French 1.e4 e6 2.d4 d5 3.Bd3

C01 Exchange Variation, French 1.e4 e6 2.d4 d5 3.exd5 exd5

C01 Monte Carlo Variation, French 1.e4 e6 2.d4 d5 3.exd5 exd5 4.c4

C01 Svenius Variation, French 1.e4 e6 2.d4 d5 3.exd5 exd5 4.Nc3 Nf6 5.Bg5

C01 Canal Attack, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.exd5 exd5 5.Bd3 Ne7 6.Qh5

C01 Perseus Gambit, French 1.e4 e6 2.d4 d5 3.Nf3

C01 Carlson Gambit, French 1.e4 e6 2.d4 d5 3.Nf3 dxe4 4.Ne5

C01 Morphy Gambit, French 1.e4 e6 2.d4 d5 3.Nh3

C01 Hoffman Gambit 1.e4 e6 2.d4 d5 3.Qe2 e5 4.f4 exf4

C01 Franco-Hiva Gambit I, French 1.e4 e6 2.d4 f5

C01 Mediterranean Defense, French 1.e4 e6 2.d4 Nf6

C02 Advance Variation, French; C02 1.e4 e6 2.d4 d5 3.e5

C02 Extended Bishop Swap, French 1.e4 e6 2.d4 d5 3.e5 Bd7

C02 Advance; Nimzovich; Steinitz Var, Fr 1.e4 e6 2.d4 d5 3.e5 Bd7

C02 Frenkel Gambit, French 1.e4 e6 2.d4 d5 3.e5 c5 4.b4

C02 Paulsen Attack, French 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3

C02 Euwe Variation, French 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Bd7

C02 Lputian Variation, French 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.a3 Nh6

C02 Milner-Barry Gambit, French 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.Bd3

C02 Milner-Barry Gambit, French 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Nc6 5.Nf3 Qb6 6.Bd3 cxd3 7.cxd3 Bd7 8.O-O Nxd4 9.Nxd4

C02 Wade Variation, French 1.e4 e6 2.d4 d5 3.e5 c5 4.c3 Qb6 5.Nf3 Bd7

C02 Nimzovich Variation, French 1.e4 e6 2.d4 d5 3.e5 c5 4.Nf3

C02 Ruisdonk Gambit, French 1.e4 e6 2.d4 d5 3.e5 c5 4.Nf3 cxd4 5.Bd3

C02 Nimzovich Attack, French 1.e4 e6 2.d4 d5 3.e5 c5 4.Qg4

C03 Tarrasch Variation, French; C03 1.e4 e6 2.d4 d5 3.Nd2

C03 Morozevich Variation, French 1.e4 e6 2.d4 d5 3.Nd2 Be7

C03 Haberditz Variation, French 1.e4 e6 2.d4 d5 3.Nd2 f5

C04 C04 1.e4 e6 2.d4 d5 3.Nd2 Nc6

C04 Guimard Variation, French 1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.Ngf3 Nf6 5.e5 Nfd7

C04 Leningrad Variation, French 1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.Ngf3 Nf6 5.e5 Nfd7 5.f4 c5 6.c3 Nc6 7.Ndf3 cxd4 8.cxd4

C05 C05 1.e4 e6 2.d4 d5 3.Nd2 Nf6

C06 Botvinnik Variation, French 1.e4 e6 2.d4 d5 3.Nd2 Nc6 4.e4 Nfd7 5.Bd3 c5 6.c3 b6

C06 C06 1.e4 e6 2.d4 d5 3.Nd2 Nf6 4.e5 Nfd7 5.Bd3

C07 Open System Tarrasch French; C07 1.e4 e6 2.d4 d5 3.Nd2 c5

C07 Shaposhnikov Gambit, French 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 Nf6

C07 Chistiakov Defense, French 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 Qxd5

C08 C08 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5

C09 C09 1.e4 e6 2.d4 d5 3.Nd2 c5 4.exd5 exd5 5.Ngf3 Nc6

C10 Normal Variation, French; C10 1.e4 e6 2.d4 d5 3.Nc3

C10 Marshall Variation, French 1.e4 e6 2.d4 d5 3.Nc3 c5

C10 Rubinstein Variation, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4

C10 Fort Knox Variation, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Bd7 5.Nf3 Bc6

C10 Rasa-Studier Gambit, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Be3

C10 Ellis Gambit, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 e5

C10 Blackburne Defense, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7

C10 Capablanca Line, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Nd7 5.Nf3 Ngf6 6.Nxf6+ Nxf6 7.Ne5

C10 Frere; Becker; Katilimov, Maric Var, French 1.e4 e6 2.d4 d5 3.Nc3 dxe4 4.Nxe4 Qd5

C10 Svenonius Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.exd5

C11 Classical Variation, French; C11 1.e4 e6 2.d4 d5 3.Nc3 Nf6

C11 Swiss Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bd3

C11 Henneberger Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Be3

C11 Burn Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4

C11 Steinitz Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5

C11 Bradford Attack, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.dxc5 Bxc5 7.Qg4

C11 Brodsky-Jones Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.dxc5 Nc6 7.a3 Bxc5 8.Qg4 O-O 9.Nf3 f6

C11 Boleslavsky Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.f4 c5 6.Nf3 Nc6 7.Be3

C11 Gledhill Attack, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.e5 Nfd7 5.Qg4

C12 C12 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5

C12 McCutcheon Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4

C12 Olland (Dutch) Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bc1

C12 Lasker Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3

C12 Duras Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Bxc3 7.bxc3 Ne4 8.Qg4 Kf8 9.Bc1

C12 Tartakower Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bd2 Nfd7

C12 Janowski Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Be3

C12 Bernstein Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.Bh4

C12 Chigorin Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.exf6

C12 Grigoriev Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.e5 h6 6.exf6 hxg5 7.fxg7 Rg8 8.h4 gxh4 9.Qg4

C12 Wolf Gambit, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4 5.Nge2

C13 Vistaneckis (Nimzovich) Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Ng8

C13 Frankfurt Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Ng8 6.Be3 b6

C13 C13 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 dxe4

C14 C14 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7

C14 Anderssen (Richter) Attack, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.Bxf6

C14 Tartakower Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Ne4

C14 Classical Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7

C14 Tarrasch Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Bd3

C14 Steinitz Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.f4

C14 Alapin Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Nb5

C14 Rubinstein Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Qd2

C14 Pollock Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.Bxe7 Qxe7 7.Qg4

C14 Chatard-Alekhine; Albin Attack, Fr 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4

C14 Maroczy Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 a6

C14 Albin-Chatard Gambit, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 Bxg5 7.hxg5 Qxg5

C14 Breyer Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 c5

C14 Teichmann Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 f6

C14 Spielmann Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Be7 5.e5 Nfd7 6.h4 O-O

C15 Winawer Variation, French; C15 1.e4 e6 2.d4 d5 3.Nc3 Bb4

C15 Winckelmann-Riemer Gambit, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.a3

C15 Fingerslip Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2

C15 Kunin Double Gambit, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2 dxe4 5.Qg4 Qxd4

C15 Schwarz's Line, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd2 Ne7 5.Nb1

C15 Kondratiyev Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Bd3 c5 5.exd5 Qxd5 6.Bd2

C15 Delayed Exchange Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.exd5

C15 Alekhine (Maroczy) Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2

C15 Kan Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.Ne2 dxe4 5.a3 Bxc3+ 6.Nxc3 Nc6

C16 C16 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5

C16 Petrosian Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 Qd7

C17 C17 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5

C17 Bogoljubow Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Bd2

C17 Icelandic Defense, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Bd2 Ne7 6.f4

C17 Moscow Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.Qg4

C18 C18 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3

C18 Swiss (Retreat) Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Ba5

C18 Armenian Line, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Ba5 6.b4 cxd4

C18 Maroczy-Willis Variation, French 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 cxd4 6.axb4 dxc3

C19 C19 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7

C19 Poisoned Pawn Variation, French Winawer 1.e4 e6 2.d4 d5 3.Nc3 Bb4 4.e5 c5 5.a3 Bxc3+ 6.bxc3 Ne7 7.Qg4

C20 King Pawn Game; C20 1.e4 e5

C20 Mengarini Opening 1.e4 e5 2.a3

C20 Portuguese Opening 1.e4 e5 2.Bb5

C20 Miguel Gambit 1.e4 e5 2.Bb5 Bc5 3.b4

C20 Tortoise Opening 1.e4 e5 2.Bd3

C20 Macleod Attack 1.e4 e5 2.c3

C20 Norwalder Gambit 1.e4 e5 2.c3 d5 3.Qh5 Bd6

C20 Lasa Gambit 1.e4 e5 2.c3 f5

C20 Whale Opening 1.e4 e5 2.c4

C20 Bavarian Gambit 1.e4 e5 2.c4 d5

C20 Clam Variation; Leonardis Variation 1.e4 e5 2.d3

C20 Indian Opening 1.e4 e5 2.d3

C20 Weber Gambit 1.e4 e5 2.d3 d5 3.exd5 c6 4.dxc6 Nxc6

C20 King's Gambit Reversed 1.e4 e5 2.d3 f5

C20 Radisch Gambit 1.e4 e5 2.d3 Nf6 3.f4 Bc5

C20 King's Head 1.e4 e5 2.f3

C20 Walkerling 1.e4 e5 2.f3 Nf6

C20 Krejcik Gambit 1.e4 e5 2.f3 Nf6 3.Bc4 Bc5 4.Ne2 Nc6 5.b4

C20 King's Head Opening 1.e4 e5 2.f3 Nf6 3.Nc3

C20 Alapin Opening 1.e4 e5 2.Ne2

C20 Napoleon Attack 1.e4 e5 2.Qf3

C20 Wayward Queen; Danvers; Parnham 1.e4 e5 2.Qh5

C20 Mellon Gambit 1.e4 e5 2.Qh5 Nc6 3.Bc4 Nh6 4.d3 g6 5.Qf3 f6 6.Ne2 d5

C20 Kiddie Countergambit 1.e4 e5 2.Qh5 Nf6

C21 Center Game; C21 1.e4 e5 2.d4

C21 Beyer Gambit 1.e4 e5 2.d4 d5

C21 Philidor Gambit 1.e4 e5 2.d4 d6 3.dxe5 Bd7

C21 Center Game Accepted 1.e4 e5 2.d4 exd4

C21 Von der Lasa Gambit 1.e4 e5 2.d4 exd4 3.Bc4

C21 Ross Gambit, Center 1.e4 e5 2.d4 exd4 3.Bd3

C21 Danish Gambit 1.e4 e5 2.d4 exd4 3.c3

C21 Sorensen Defense, Center 1.e4 e5 2.d4 exd4 3.c3 d5

C21 Danish Gambit Accepted 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2

C21 Copenhagen Defense, Danish Gambit 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Bb4+

C21 Schlechter Defense, Center 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 d5

C21 Classical Defense, Danish Gambit 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Nf6

C21 Chigorin Defense, Danish Gambit 1.e4 e5 2.d4 exd4 3.c3 dxc3 4.Bc4 cxb2 5.Bxb2 Qe7

C21 Svenonius Defense, Center 1.e4 e5 2.d4 exd4 3.c3 Ne7

C21 Halasz-McDonnell Gambit 1.e4 e5 2.d4 exd4 3.f4

C21 Crocodile Variation, Center Game 1.e4 e5 2.d4 exd4 3.f4 Bc5 4.Nf3 Nc6 5.c3

C21 Lanc-Arnold Gambit, Center 1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3

C21 Scippler Gambit, Center 1.e4 e5 2.d4 exd4 3.Nf3 Bc5 4.c3 dxc3 5.Bc4

C22 C22 1.e4 e5 2.d4 exd4 3.Qxd4

C22 Hall Variation, Center 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qc4

C22 Paulsen Attack Variation, Center 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3

C22 Berger Variation, Center 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Nf6

C22 Kupreichik Variation, Center 1.e4 e5 2.d4 exd4 3.Qxd4 Nc6 4.Qe3 Nf6 5.Nc3 Bb4 6.Bd2 O-O 7.O-O-O Re8 8.Bc4

C23 Bishop's Opening; C23 1.e4 e5 2.Bc4

C23 Anderssen Gambit 1.e4 e5 2.Bc4 b5 3.Bxb5 c6

C23 Thorold Gambit 1.e4 e5 2.Bc4 b5 3.Bxb5 f5

C23 Classical Variation, Bishop; Boi Variation 1.e4 e5 2.Bc4 Bc5

C23 MacDonnell Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.b4

C23 Labourdonnais-Denker Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.b4 Bxb4 4.c3

C23 McDonnell Double Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.b4 Bxb4 4.f4

C23 Philidor Variation, Bishop 1.e4 e5 2.Bc4 Bc5 3.c3

C23 Lewis Counter-Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.c3 d5

C23 Lewis Countergambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.c3 d5 4.Bxd5 Nf6

C23 Walker Variation, Bishop 1.e4 e5 2.Bc4 Bc5 3.c3 d5 4.Bxd5 Nf6 5.d4

C23 Lewis Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.d4

C23 Stein Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.f4

C23 Lopez Variation, Bishop 1.e4 e5 2.Bc4 Bc5 3.Qe2

C23 Lopez Gambit, Bishop 1.e4 e5 2.Bc4 Bc5 3.Qe2 Nf6 4.f4

C23 Khan Gambit, Bishop 1.e4 e5 2.Bc4 d5

C23 King's Gambit Reversed, Bishop 1.e4 e5 2.Bc4 f5

C23 Calabrese Counter-Gambit 1.e4 e5 2.Bc4 f5

C23 Kreijcik Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.f3 Bc5 4.Ne2 Nc6 5.b4

C23 Greco Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.f4

C23 Horwitz Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.Nc3 b5

C23 Blanel Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.Nc3 Nxe4

C23 Paschmann Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.Ne2 Nxe4 4.Nec3

C23 Meitner-Mieses Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.Bc4 Bc5 4.Qg4 Qf6 5.Nd5

C23 Bronstein Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.Bc4 Nf6 4.f4 Nxe4 5.Nf3

C24 Berlin Defense, Bishop; C24 1.e4 e5 2.Bc4 Nf6

C24 Spielmann Attack, Bishop 1.e4 e5 2.Bc4 Nf6 3.d3 Bc5 4.Nc3

C24 Kitchner Folly, Bishop 1.e4 e5 2.Bc4 Nf6 3.d3 Be7 4.Nf3 O-O

C24 Vienna Hybrid, Bishop 1.e4 e5 2.Bc4 Nf6 3.d3 Nc6 4.Nc3

C24 Hromadka Variation, Bishop 1.e4 e5 2.Bc4 Nf6 3.d3 Nc6 4.Nc3 Bb4 5.Ne2

C24 Ponziani Center Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.d4

C24 Warsaw Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.c3

C24 Urusov; Ouroussoff; Keidansky G 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3

C24 Keidansky Gambit, Bishop 1.e4 e5 2.Bc4 Nf6 3.d4 exd4 4.Nf3 Nxe4 5.Qxd4

C25 Vienna; Hamppe Opening; C25 1.e4 e5 2.Nc3

C25 Zhuravlev Counter-Gambit, Vienna 1.e4 e5 2.Nc3 Bb4 3.Qg4

C25 Zhuraviev Countergambit, Vienna 1.e4 e5 2.Nc3 Bb4 3.Qg4 Nf6

C25 Anderssen Defense, Vienna 1.e4 e5 2.Nc3 Bc5

C25 Hamppe-Mietner Variation, Vienna 1.e4 e5 2.Nc3 Bc5 3.Na4

C25 Giraffe Attack, Vienna 1.e4 e5 2.Nc3 Bc5 3.Qg4

C25 Omaha Gambit, Vienna 1.e4 e5 2.Nc3 d6 3.f4

C25 Fyfe Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.d4

C25 Philidor Countergambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.d4 f5

C25 Alapin Variation, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4

C25 Vienna Gambit 1.e4 e5 2.Nc3 Nc6 3.f4

C25 Quelle Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 Bc5 4.fxe5 d6

C25 Steinitz Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4

C25 Fraser-Minckwitz Variation, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 b6

C25 Zukertort Defense, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 d5

C25 Paulsen Defense, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 d6

C25 Soerensen Defense, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.d4 Qh4+ 5.Ke2 g5

C25 Knight Variation, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3

C25 Cunningham Defense, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 Be7

C25 Hamppe-Muzio Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.Bc4 g4 6.O-O

C25 Pierce Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.d4

C25 Hamppe-Allgaier Gambit, Vienna 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.h4 g4 6.Ng5

C25 Hamppe-Allgaier-Thorold Gambit 1.e4 e5 2.Nc3 Nc6 3.f4 exf4 4.Nf3 g5 5.h4 g4 6.Ng5 h6 7.Nxf7 Kxf7 8.d4

C25 Paulsen Variation, Vienna 1.e4 e5 2.Nc3 Nc6 3.g3

C25 Mariotti Gambit 1.e4 e5 2.Nc3 Nc6 3.g3 Bc5 4.Bg2 h5 5.Nf3 h4

C25 Polluck Gambit, Vienna 1.e4 e5 2.Nc3 Nf6 3.g3 Bc5 4.Bg2 Nc6 5.Nge2 d5 6.exd5

C25 Erben Gambit, Vienna 1.e4 e5 2.Nc3 Nf6 3.g3 d5 4.exd5 c6

C25 Hamppe Meitner, Vienna 1.e4 e5 2.Nf3 Bc5 3.Na4

C26 Falkbeer Variation, Vienna; C26 1.e4 e5 2.Nc3 Nf6

C26 Mengarini Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.a3

C26 Oxford Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.d3

C26 Mieses Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.g3

C27 Stanley Variation, Vienna; C27 1.e4 e5 2.Nc3 Nf6 3.Bc4

C27 Reversed Spanish, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bb4

C27 Bishop Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5

C27 Eifel Gambit, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 4.Nge2 b5

C27 Modern Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4

C27 Boden-Kieseritzky Gambit, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Nf3

C27 Monster Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Be7

C27 Alekhine Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Be7 6.Nf3 Nc6 7.Nxe5

C27 Adams Gambit, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.d4

C27 Frankenstein-Dracula Var, Vienna 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nxe4 4.Qh5 Nd6 5.Bb3 Nc6 6.Nb5 g6 7.Qf3 f5 8.Qd5 Qe7

C28 Three Knights Variation, Vienna; C28 1.e4 e5 2.Nc3 Nf6 3.Bc4 Nc6

C29 Vienna Gambit, Vienna; C29 1.e4 e5 2.Nc3 Nf6 3.f4

C29 Steinitz Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.d3

C29 Wurzburger Trap, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.d3 Qh4 6.g3 Nxg3 7.Nf3 Qh5 8.Nd5 Bxd5 9.Nf4

C29 Breyer Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Nf3 Be7

C29 Kaufmann Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Nf3 Bg4 6.Qe2

C29 Paulsen Attack, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Qf3

C29 Bardeleben Variation, Vienna 1.e4 e5 2.Nc3 Nf6 3.f4 d5 4.fxe5 Nxe4 5.Qf3 f5

C30 King's Gambit; C30 1.e4 e5 2.f4

C30 Classical Defense, KGD 1.e4 e5 2.f4 Bc5

C30 Heath Variation, KGD; Rotlewi Countergambit 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.b4

C30 Marshall (Euwe) Attack, KGD 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 Bg4 5.fxe5 dxe5 6.Qa4+

C30 Rubinstein Countergambit, KGD 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.c3 f5

C30 Svenonius Variation, KGD 1.e4 e5 2.f4 Bc5 3.Nf3 d6 4.Nc3 Nf6 5.Bc4 Nc6 6.d3 Bg4

C30 Senechaud Counter-Gambit, KGD 1.e4 e5 2.f4 Bc5 3.Nf3 g5

C30 Mafia Defense, KGD 1.e4 e5 2.f4 c5

C30 Panteldakis Countergambit, KGD 1.e4 e5 2.f4 f5

C30 Soller-Zilbermints Gambit, KGD 1.e4 e5 2.f4 f6 3.fxe5 Nc6

C30 Zilbermints Double Countergambit; KGD 1.e4 e5 2.f4 g5

C30 Queen's Knight Defense, KGD 1.e4 e5 2.f4 Nc6

C30 Miles Defense, KGD 1.e4 e5 2.f4 Nc6 3.Nf3 f5

C30 Zilbermints Double Gambit I, KGD 1.e4 e5 2.f4 Nc6 3.Nf3 g5

C30 Petrov's Defense, KGD 1.e4 e5 2.f4 Nf6

C30 Norwalde (Norwalder) Variation, KGD 1.e4 e5 2.f4 Qf6

C30 Schubert Variation, KGD 1.e4 e5 2.f4 Qf6 3.Nc3 Qxf4 4.d4

C30 Keene Defense, KGD 1.e4 e5 2.f4 Qh4+ 3.g3 Qe7

C31 Falkbeer Counter-Gambit, KGD; C31 1.e4 e5 2.f4 d5

C31 Hinrichsen Gambit, KGD 1.e4 e5 2.f4 d5 3.d4

C31 Falkbeer Countergambit Accepted, KGD 1.e4 e5 2.f4 d5 3.exd5

C31 Miles Gambit, KGD 1.e4 e5 2.f4 d5 3.exd5 Bc5

C31 Nimzovich-Marshall Variation, KGD 1.e4 e5 2.f4 d5 3.exd5 c6

C31 Marshall C-G, KGD 1.e4 e5 2.f4 d5 3.exd5 c6

C31 Pickler Gambit, KGD 1.e4 e5 2.f4 d5 3.exd5 c6 4.dxc6 Bc5

C31 Nimzovich Variation, KGD; Anderssen Attack 1.e4 e5 2.f4 d5 3.exd5 e4 4.Bb5+

C31 Blackbunre Attack, KGD 1.e4 e5 2.f4 d5 3.Nf3

C32 Staunton Line, KGD; C32 1.e4 e5 2.f4 d5 3.exd5 e4

C32 Reti (Charousek) Variation, KGD 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3

C32 Morphy Defense, KGD 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Nc3 Bb4 6.Bd2 e3

C32 Keres Variation, KGD 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Nd2

C32 Old Line, Falkbeer Countergambit, KGD 1.e4 e5 2.f4 d5 3.exd5 e4 4.d3 Nf6 5.Qe2

C32 Modern Transfer, Falkbeer Countergambit, KGD 1.e4 e5 2.f4 d5 3.exd5 exf4

C33 King's Gambit Accepted; C33 1.e4 e5 2.f4 exf4

C33 Orsini Gambit, KGA 1.e4 e5 2.f4 exf4 3.b3

C33 Schurig Gambit, KGA 1.e4 e5 2.f4 exf4 3.Bb5

C33 Bishop's Gambit, KGA 1.e4 e5 2.f4 exf4 3.Bc4

C33 Kieseritzky Gambit, Bishop's Gambit, KGA 1.e4 e5 2.f4 exf4 3.Bc4 b5

C33 Lopez Defense, KGA 1.e4 e5 2.f4 exf4 3.Bc4 c6

C33 Bledow; Morphy Defense, KGA 1.e4 e5 2.f4 exf4 3.Bc4 d5

C33 Bledow Countergambit, KGA 1.e4 e5 2.f4 exf4 3.Bc4 d5 4.Bxd5 Nf6

C33 Gianutio Counter-Gambit, KGA 1.e4 e5 2.f4 exf4 3.Bc4 f5

C33 Anderssen Defense, KGA 1.e4 e5 2.f4 exf4 3.Bc4 g5

C33 Maurian Defense, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Nc6

C33 Cozio; Hanneken; Prussian; Lichtenhein 1.e4 e5 2.f4 exf4 3.Bc4 Nf6

C33 Bogoljubow Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Nf6 4.Nc3

C33 Bogoljubov; Jaenisch Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Nf6 4.Nc3 c6

C33 Bryan; Kieseritzky Gambit, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 b5

C33 Greco Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Bc5

C33 Cozio Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 d6

C33 Classical Defense, KGA; Lopez Variation 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5

C33 Grimm Attack, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.d4 d6 7.e5

C33 MacDonnell Attack, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.d4 Ne7 7.g3

C33 McDonnell Attack, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.g3

C33 Fraser Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Nc3 Bg7 6.g3 fxg3 7.Qf3

C33 Cozio Attack, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 g5 5.Qf3

C33 Boden Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Nc6

C33 Jaenisch Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Nf6

C33 Jaenisch Variation, KGA 1.e4 e5 2.f4 exf4 3.Bc4 Qh4+ 4.Kf1 Qf6

C33 Lesser Bishop; Tartakower 1.e4 e5 2.f4 exf4 3.Be2

C33 Weiss Defense, KGA 1.e4 e5 2.f4 exf4 3.Be2 f5 4.exf5 d6

C33 Central; Polerio; Willemson, Steinitz 1.e4 e5 2.f4 exf4 3.d4

C33 Gaga Gambit, KGA 1.e4 e5 2.f4 exf4 3.g3

C33 Gama Gambit, KGA 1.e4 e5 2.f4 exf4 3.g3 fxg3 4.Nf3

C33 Leonardo (Stamma) Gambit, KGA 1.e4 e5 2.f4 exf4 3.h4

C33 Drunken King, KGA 1.e4 e5 2.f4 exf4 3.Kf2

C33 Tumbleweed; King's Own, KGA 1.e4 e5 2.f4 exf4 3.Kf2

C33 Keres, Mason, Parnu, Requena 1.e4 e5 2.f4 exf4 3.Nc3

C33 Requena Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nc3 Qh4+

C33 Paris Gambit, KGA 1.e4 e5 2.f4 exf4 3.Ne2

C33 Eisenberg Variation, KGA 1.e4 e5 2.f4 exf4 3.Nh3

C33 Basman Gambit, KGA 1.e4 e5 2.f4 exf4 3.Qe2

C33 Bilguer-Mirage Variation, KGA 1.e4 e5 2.f4 exf4 3.Qe2

C33 Breyer; Hungarian; Carrera, KGA 1.e4 e5 2.f4 exf4 3.Qf3

C33 Dodo Gambit, KGA 1.e4 e5 2.f4 exf4 3.Qg4

C33 Carrera Gambit, KGA 1.e4 e5 2.f4 exf4 3.Qh5

C34 King's Knight Gambit, KGA; C34 1.e4 e5 2.f4 exf4 3.Nf3

C34 Fischer Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 d6

C34 Schulder Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 d6 4.b4

C34 Gianutio Countergambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 f5

C34 Becker; Anti-Kieseritzky Var, KGA 1.e4 e5 2.f4 exf4 3.Nf3 h6

C34 MacLeod Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 Nc6

C34 Bonsch-Osmolovsky Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 Ne7

C34 Schallop Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 Nf6

C34 Tashkent Attack, KGA 1.e4 e5 2.f4 exf4 3.Nf3 Nf6 4.e5 Nh5 5.g4

C35 Cunningham Gambit, KGA; C35 1.e4 e5 2.f4 exf4 3.Nf3 Be7

C35 Wild Cunningham Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Bh4+

C35 Bertin; Three Pawns Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Bh4+ 5.g3

C35 Neo-Cunningham Gambit, KGA; McCormick Defense 1.e4 e5 2.f4 exf4 3.Nf3 Be7 4.Bc4 Nf6

C36 Scandinavian Variation, KGA; Modern Defense, KGA; C36 1.e4 e5 2.f4 exf4 3.Nf3 d5

C36 Abbazia Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 d5 4.exd5 Nf6

C37 C37 1.e4 e5 2.f4 exf4 3.Nf3 g5

C37 Ghulam Kassim; Koch Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4

C37 Middleton Counter-Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 d6 5.O-O Bg4 6.h3 h5 7.hxg4

C37 Greco-Lolli; Wild Muzio Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Bxf7+

C37 Young Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Bxf7+ Kxf7 6.O-O gxf3 7.Qxf3 Qf6 8.d4 Qxd4+ 9.Be3

C37 Koch; Ghulam Kassim Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4

C37 Kotov Gambit 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4 gxf3 6.Bxf4

C37 Ghulam-Kassim Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.d4 gxf3 6.Qxf3

C37 Australian Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.h4

C37 MacDonnell Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Nc3

C37 Salvio Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5

C37 Cochrane Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 f3

C37 Herzfeld; Portuguese; Vienna, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nc6

C37 Santa Maria Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nf6

C37 Silberschmidt Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6

C37 Anderssen Counter-Attack, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.Ne5 Qh4+ 6.Kf1 Nh6 7.d4 d6

C37 Muzio-Polerio Gambit, KGA; Wild Muzio 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O

C37 Brentano Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O d5

C37 Holloway Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Nc6

C37 From Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qe7

C37 Sarratt Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6

C37 Young Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Bxf7+ Kxf7 8.d4 Qxd4+ 9.Be3 Qf6

C37 Double Muzio Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.Bxf7+

C37 Paulsen Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.e5 Qxe5 8.d3 Bh6 9.Nc3 Ne7 10.Bd2

C37 Bello Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Nc3

C37 Baldwin Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O gxf3 6.Qxf3 Qf6 7.Nc3 Qd4+ 8.Kh1 Qxc4 9.Nd5

C37 Kling & Horwitz Counter-Attack, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 g4 5.O-O Qe7

C37 Blachy Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Nc6

C37 Rosentreter Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4

C37 Soerensen Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 Bg4 5.Nc3

C37 Sorensen Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 Bg4 5.Ne5

C37 Bird Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 Bg4 5.Ne5 Qh4+ 6.g3

C37 Rosentreter-Testa Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.d4 g4 5.Bxf4

C37 Quaade; Taylor Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Nc3

C38 Traditional Variation, KGA; C38 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7

C38 Mayet Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.d4 d6 6.c3

C38 Philidor Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.h4

C38 Greco Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.h4 h6 6.d4 d6

C38 Greco; Calabrian Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.h4 h6 6.d4 d6 7.hxg5 hxg5 8.Rxh8 Rxh8 9.Nc3

C38 Schultz Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.h4 h6 6.d4 d6 7.Qd3

C38 Hanstein Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.Bc4 Bg7 5.O-O

C39 C39 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4

C39 Kieseritzky Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5

C39 Paulsen Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Bg7

C39 Campbell; Brentano; Morphy Var, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 d5

C39 Green; Kolisch Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 d6

C39 Long Whip Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 h5

C39 Cotter Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 h6 6.Nxf7

C39 Neumann Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nc6

C39 Berlin Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6

C39 Anderssen Defense, Kieseritsky Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6

C39 Anderssen-Cordel Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.d4 Nh5 9.Bxf4 Nxf4

C39 Rice Gambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.O-O

C39 Rice Gambit Accepted, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bd6 8.O-O Bxe5

C39 Paulsen Defense Deferred, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Bc4 d5 7.exd5 Bg7

C39 Rubinstein Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.d4

C39 Riviere Variation, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Nf6 6.Nxg4 d5

C39 Rosenthal; Stockwhip Var, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ne5 Qe7

C39 Allgaier; Cotter Cambit, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5

C39 Walker (Urusov) Attack, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Bc4+

C39 Urusov Attack, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Bc4+ d5 8.Bxd5+ Ke8 9.d4

C39 Thorold Attack, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.d4

C39 Horny Defense, KGA 1.e4 e5 2.f4 exf4 3.Nf3 g5 4.h4 g4 5.Ng5 h6 6.Nxf7 Kxf7 7.Qxg4 Nf6 8.Qxf4

C40 King's Knight Opening; C40 1.e4 e5 2.Nf3

C40 Glatz Gambit; Busch-Gass Gambit 1.e4 e5 2.Nf3 Bc5

C40 Chiodini Gambit 1.e4 e5 2.Nf3 Bc5 3.Nxe5 Nc6

C40 Jalalabad Defense 1.e4 e5 2.Nf3 c5

C40 Gunderam Gambit 1.e4 e5 2.Nf3 c6

C40 Queen's Pawn Counter-Gambit; Elephant Gambit 1.e4 e5 2.Nf3 d5

C40 Maroczy; Elephant Gambit 1.e4 e5 2.Nf3 d5 3.exd5 Bd6

C40 Halasz-Jacobsen Gambit 1.e4 e5 2.Nf3 d5 3.exd5 Bd6

C40 Maroczy Gambit 1.e4 e5 2.Nf3 d5 3.exd5 Bd6

C40 Paulsen Counter-Gambit 1.e4 e5 2.Nf3 d5 3.exd5 e4

C40 Wasp Variation 1.e4 e5 2.Nf3 d5 3.Nxe5 dxe4 4.Bc4 Qg5

C40 Latvian; Greco Counter-Gambit 1.e4 e5 2.Nf3 f5

C40 Senechaud Gambit, Latvian 1.e4 e5 2.Nf3 f5 3.b4

C40 Mayet Attack, Latvian 1.e4 e5 2.Nf3 f5 3.Bc4

C40 Strautins Gambit, Latvian 1.e4 e5 2.Nf3 f5 3.Bc4 b5

C40 Polerio-Svedenborg Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 d5

C40 Poisoned Pawn Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 Qg5 5.d4 Qxg2

C40 Duke of Courland Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Bc4 fxe4 4.Nxe5 Qg5 5.d4 Qxg2 6.Qh5 g6 7.Bf7 Kd8 9.Bg6 Qh1

C40 Morgado Defense, Latvian 1.e4 e5 2.Nf3 f5 3.Bc4 Nf6

C40 Diepstraten Countergambit, Latvian 1.e4 e5 2.Nf3 f5 3.c4

C40 Clam Gambit, Latvian 1.e4 e5 2.Nf3 f5 3.d3 Nc6 4.exf5

C40 Mason Countergambit, Latvian 1.e4 e5 2.Nf3 f5 3.d4

C40 Latvian Gambit Accepted 1.e4 e5 2.Nf3 f5 3.exf5

C40 Lobster Gambit, Latvian 1.e4 e5 2.Nf3 f5 3.g4

C40 Mlotkowski Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Nc3

C40 Fraser Defense, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Nc6

C40 Corkscrew Counter-Gambit, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Nf6 4.Bc4 fxe4 5.Nf7 Qe7 8.Nxh8 d5

C40 Greco Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qe7

C40 Mail Line, Latvian Gambit Accepted 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4

C40 Bilguer Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4

C40 Bronstein Attack, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Be2

C40 Nimzovich Attack, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Ne3

C40 Bronstein Gambit, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.d4 d6 5.Nc4 fxe4 6.Qh5+ g6 7.Qe2

C40 Foltys-Leonhardt Variation, Latvian Gambit 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4

C40 Foltys Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4 fxe4 5.d3

C40 Leonhardt Variation, Latvian 1.e4 e5 2.Nf3 f5 3.Nxe5 Qf6 4.Nc4 fxe4 5.Nc3

C40 Damiano Defense 1.e4 e5 2.Nf3 f6

C40 Damiano Gambit 1.e4 e5 2.Nf3 f6 3.Nxe5 fxe5 4.Qh5+ g6 5.Qxe5+ Qe7 6.Qxh8

C40 Chigorin Gambit, Damiano 1.e4 e5 2.Nf3 f6 3.Nxe5 Qe7 4.Nf3 d5

C40 Levenstein; Queen's Defense; Brazilian; Gunderam 1.e4 e5 2.Nf3 Qe7

C40 Gunderam Gambit 1.e4 e5 2.Nf3 Qe7 3.Bc4 f5

C40 McConnell Defense 1.e4 e5 2.Nf3 Qf6

C40 Greco Defense 1.e4 e5 2.Nf3 Qf6

C40 Labourdonnais Gambit 1.e4 e5 2.Nf3 Qf6 3.Bc4 Qg6 4.O-O

C41 Philidor Defense; C41 1.e4 e5 2.Nf3 d6

C41 Lopez Counter-Gambit, Philidor 1.e4 e5 2.Nf3 d6 3.Bc4 f5

C41 Philidor Gambit 1.e4 e5 2.Nf3 d6 3.d4 Bd7

C41 Alapin-Blackburne Gambit, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Bg4 4.dxe5 Nd7

C41 Exchange Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 exd4

C41 Morphy Gambit, Philidor 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Bc4

C41 Bird Gambit, Philidor 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.c3

C41 Paulsen Attack, Philidor 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 d5 5.exd5

C41 Larsen Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Nxd4 g6

C41 Boden Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 exd4 4.Qxd4 Bd7

C41 Philidor Counter Attack 1.e4 e5 2.Nf3 d6 3.d4 f5

C41 Zukertort Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 f5 4.Nc3

C41 Hanham; Lord Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7

C41 Delmar Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.c3

C41 Schlechter Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.Nc3

C41 Krause Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.O-O

C41 Steiner Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 c6 5.O-O Be7 6.dxe5

C41 Sharp Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Bc4 Nb6

C41 Lion Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nd7 4.Nc3 Nf6

C41 Jaenisch Counter-Attack, Philidor; Nimzovich Variation 1.e4 e5 2.Nf3 d6 3.d4 Nf6

C41 Klein Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Bc4

C41 Sokolsky Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.dxe5 Nxe4 5.Nbd2

C41 Rellstab Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.dxe5 Nxe4 5.Qd5

C41 Larobok Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Nc3 Nbd7

C41 Locock Variation, Philidor 1.e4 e5 2.Nf3 d6 3.d4 Nf6 4.Ng5 h6 5.Nxf7

C42 Petrov Defense; Russian Defense; C42 1.e4 e5 2.Nf3 Nf6

C42 Urosov Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Bc4

C42 Boden-Kieseritzky Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3

C42 Lichtenhein Defense, Petrov 1.e4 e5 2.Nf3 Nf6 3.Bc4 Nxe4 4.Nc3 d5

C42 Russian Three Knights Var, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nc3

C42 Paulsen Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nc4

C42 Karklins-Martinovsky Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nd3

C42 Millenium Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Bd3

C42 Kaufmann Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.c4

C42 French Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d3

C42 Classical Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4

C42 Marshall Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6

C42 Tarrasch Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.O-O O-O 8.c4 Bg4

C42 Staunton Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Bd6 7.O-O O-O 8.c4 c6

C42 Jaenisch Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.c4

C42 Browne Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.c4 Nb4 9.cxd5

C42 Chigorin Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1

C42 Berger Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O Nc6 8.Re1 Bg4 9.c3 f5 10.Nbd2

C42 Mason Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Be7 7.O-O O-O

C42 Mason-Showalter Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d4 d5 6.Bd3 Nc6

C42 Nimzovich Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Nc3

C42 Lasker Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2

C42 Cozio (Lasker) Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.Qe2

C42 Cochrane Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nxf7

C42 Stafford Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nc6

C42 Damiano Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4

C42 Kholmov Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 Nxe4 4.Qe2 Qe7

C42 Moody Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Qe2 Nc6 4.d4

C43 Modern Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4

C43 Symmetrical Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4 d5

C43 Suchting Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.Bc4

C43 Tal Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Bb5

C43 Center Attack, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4 exd4 4.e5 Ne4 5.Qxd4

C43 Trifunovic Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 d5 5.Nxe5 Bd6 6.O-O O-O 7.c4 Bxe5

C43 Murret Variation, Petrov 1.e4 e5 2.Nf3 Nf6 3.d4 Nxe4 4.Bd3 Nc6

C43 Steinitz Variation, Petoff; C43 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.d4

C43 Urusov Gambit, Petrov 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.d4 exd4 4.Bc4

C44 C44 1.e4 e5 2.Nf3 Nc6

C44 Paschman Wing Gambit 1.e4 e5 2.Nf3 Nc6 3.b4

C44 Taylor Opening; Inverted Hungarian 1.e4 e5 2.Nf3 Nc6 3.Be2

C44 Inverted Hanham Opening 1.e4 e5 2.Nf3 Nc6 3.Be2 Nf6 4.d3 d5 5.Nbd2

C44 Basman Gambit 1.e4 e5 2.Nf3 Nc6 3.Be2 Nf6 4.d4 exd4 5.e5

C44 Ponziani; Staunton; English Knights 1.e4 e5 2.Nf3 Nc6 3.c3

C44 Spanish Variation, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Bb5

C44 Nikitin Gambit, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Bb5 dxe4 5.Nxe5 Qd5 6.Qa4

C44 Caro Variation, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 Bd7

C44 Steinitz Variation, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 f6

C44 Leonhardt Variation, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 d5 4.Qa4 Nf6

C44 Ponziani Counter-Gambit 1.e4 e5 2.Nf3 Nc6 3.c3 f5

C44 Schmidt Attack, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 f5 4.d4 d6 5.d5

C44 Jaenisch Counterattack, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6

C44 Neumann Gambit, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.Bc4

C44 Breyer Opening, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d3 Be7 5.b4

C44 Vukovic Gambit, Ponziani 1.e4 e5 2.Nf3 Nc6 3.c3 Nf6 4.d4 Nxe4 5.d5 Bc5

C44 Dresden Opening 1.e4 e5 2.Nf3 Nc6 3.c4

C44 Scotch Game 1.e4 e5 2.Nf3 Nc6 3.d4

C44 MacLopez; Relfsson Gambit, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bb5

C44 Scotch Gambit 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4

C44 London Defense, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bb4+

C44 Vitzhum Attack, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.Ng5 Nh6 6.Qh5

C44 Paulsen; Anderssen C-A, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Bc5 5.O-O d6 6.c3 Bg4

C44 Benima Defense, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Bc4 Be7

C44 Goering Gambit, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3

C44 Goering Gambit Declined, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 d5

C44 Double Pawn Sacrifice, Goering Gambit 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Bc4

C44 Bardeleben Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.c3 dxc3 5.Nxc3 Bb4 6.Bc4 Nf6

C44 Lolli Attack, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 Nxd4

C44 Napoleon Gambit, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 Nxd4 4.Nxd4 exd4 5.Bc4

C44 Konstantinopolsky Opening 1.e4 e5 2.Nf3 Nc6 3.g3

C44 Chicago; Irish; Schulze-Muller Gambit 1.e4 e5 2.Nf3 Nc6 3.Nxe5 Nxe5 4.d4

C45 C45 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4

C45 Malaniuk Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bb4+

C45 Classical Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5

C45 Gunsberg Defense, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Bb5 Nd8

C45 Fleissig; Meitner Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Nc2

C45 Blackburne Attack, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Qd2

C45 Millennium Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Qg6

C45 Blumenfeld Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.Nb5

C45 Potter Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nb3

C45 Romanishin Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nb3 Bb4+

C45 Geller Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nb3 Bb6 6.a4 a6 7.Nc3 Nf6

C45 Intermezzo Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Nxc6 Qf6

C45 Alekhine Gambit, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.e5

C45 Schmidt Var; Scotch Four Knights 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nc3

C45 Mieses Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nxc6

C45 Tartakower Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Nf6 5.Nxc6 bxc6 6.Nd2

C45 Steinitz; Pulling Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4

C45 Braune Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Be3

C45 Horwitz Attack, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nb5

C45 Steinitz Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nc3

C45 Modern Defesne, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nc3 Bb4

C45 Fraser Attack, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nf3

C45 Paulsen Variation, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Qh4 5.Nf5

C45` Paulsen Attack, Scotch 1.e4 e5 2.Nf3 Nc6 3.d4 exd4 4.Nxd4 Bc5 5.Be3 Qf6 6.c3 Nge7 7.Bb5

C46 Three Knights Opening; C46 1.e4 e5 2.Nf3 Nc6 3.Nc3

C46 Schlechter Variation, Three Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Bb4 4.Nd5 Nf6

C46 Winawer Defense, Three Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 f5

C46 Steinitz Defense, Three Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 g6

C46 Rosenthal Variation, Three Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 g6 4.d4 exd4 5.Nd5

C46 Italian Variation, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bc4

C46 Halloween Gambit, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Nxe5

C47 Four Knights Openng; C47 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6

C47 Gunsberg Variation, Four Kngiths 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.a3

C47 Provincial Opening, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.a3 d6 5.h3

C47 Noa Gambit, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bc4 Nxe4 5.Bxf7+

C47 Bogoljubow (Scotch) Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4

C47 Oxford Gambit, Four Kngihts 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.d5 Nd4

C47 Krause Gambit, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.Nxe5

C47 Leonhardt Defense, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 Bb4 5.Nxe5 Qe7

C47 Belgrade Gambit, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nd5

C47 Schmid Gambit, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.d4 exd4 5.Nxd4 Nxe4

C48 Spanish Four Knights Game; C48 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5

C48 Ranken Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 a6 5.Bxc6

C48 Classical Variation, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5

C48 Marshall Gambit, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bc5 5.Nxe5 Nd4 6.Ba4 O-O

C48 Rubinstein Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Nd4

C49 Double Ruy Lopez Opening, 4 Knights; C49 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4

C49 Paulsen Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.Bxc6

C49 Svenonius Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 Bxc3 7.bxc3 d5

C49 Janowski Variation, Four Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 Bxc3 7.bxc3 d6 8.Re1

C49 Symmetrical Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6

C49 Bernstein Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Ne7

C49 Metger Unpin Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Bxc3 8.bxc3 Qe7 9.Re1 Nd8

C49 Pillsbury Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Bg5 Ne7

C49 Maroczy Variation, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.d3 d6 7.Ne2

C49 Blackburne Attack, 4 Knights 1.e4 e5 2.Nf3 Nc6 3.Nc3 Nf6 4.Bb5 Bb4 5.O-O O-O 6.Nd5 Bc5 7.d4

C50 Italian Game; C50 1.e4 e5 2.Nf3 Nc6 3.Bc4

C50 Giuoco Piano; Italian Opening 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5

C50 Jerome Gambit; Kentucky Opening 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Bxf7+

C50 Giuoco Pianissimo 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3

C50 Lucchini Gambit; Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 f5

C50 Italian Four Knights Variation 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 Nf6 5.Nc3

C50 Canal Variation, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d3 Nf6 5.Nc3 d6 6.Bg5

C50 Rosentreter Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.d4

C50 Italian Variation, Four Knights Game 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.Nc3 Nf6

C50 Deutz Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.O-O Nf6 5.d4

C50 Hungarian Defense 1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7

C50 Tartakower Variation, Hungarian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Be7 4.d4 exd4 5.c3 Nf6 6.e4 Ne4

C50 Half Giuoco Piano; Semi-Italian Opening 1.e4 e5 2.Nf3 Nc6 3.Bc4 d6

C50 Rousseau Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 f5

C50 Shilling (Kostic) Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nd4

C51 Evans Gambit; C51 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4

C51 Lange Variation, Evans Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bb6 5.b5 Na5 6.Nxe5 Nh6

C51 Evans Gambit Accepted 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4

C51 Normal Position, Evans Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6

C51 Ulvestad Variation, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.d5 Na5 10.Bb2

C51 Paulsen Variation, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.d5 Na5 10.Bb2 Ne7

C51 Morphy Attack, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.Nc3

C51 Fraser Attack; Mortimer, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.Nc3 Bg4 10.Qa4

C51 Goering Attack, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bc5 6.d4 exd4 7.O-O d6 8.cxd4 Bb6 9.Nc3 Na5 10.Bg5

C51 Stone-Ware Defense, Evans Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Bd6

C51 Anderssen Variation, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Be7

C51 Cordel Line, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Be7 6.d4 Na5

C51 Hein Countergambit, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 d5

C52 Main Line, Evans Gambit; C52 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5

C52 Leonhardt Variation, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 b5

C52 Sokolsky Variation, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.Bg5

C52 Lasker Defense, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.O-O Bb6

C52 Tartakower Attack, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 d6 7.Qb3

C52 Pierce Defense, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4

C52 Schulen Defense, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.O-O b5

C52 Waller Attack, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.O-O d6 8.Qb3

C52 Compromised Defense, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.O-O dxc3

C52 Mieses Defense, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.d4 exd4 7.O-O Nge7

C52 Slow Variation, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.O-O

C52 Richardson Attack, Evans 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.b4 Bxb4 5.c3 Ba5 6.O-O Nf6 7.d4 O-O 8.Nxe5

C53 Classical Variation, Italian; C53 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3

C53 Labourdonnais Variation, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 d6 5.d4 exd4 6.cxd4 Bb6

C53 Alexandre Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 f5

C53 Giuoco Pianissimo 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d3

C53 Center Attack, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4

C53 Grevo Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4

C53 Albin Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.O-O

C53 Lewis Defense, Italian; Closed Variation 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7

C53 Center Holding Variation, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7 5.d4 Bb6

C53 Mestel Variation, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Qe7 5.d4 Bb6 6.Bg5

C54 C54 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6

C54 Bird Attack, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.b4

C54 Cracow Variation, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Kf1

C54 Moeller (Therkatz) Attack, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.O-O Bxc3 9.d5

C54 Therkatz-Herzog, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.O-O Bxc3 9.d5 Bf6 10.Re1 Ne7

C54 Greco Variation, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb4+ 7.Nc3 Nxe4 8.O-O Nxc3

C54 Mason Gambit, Italian 1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.O-O

C55 Two Knights Defense; C55 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6

C55 De Riviere Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.c3

C55 Modern Bishop's Opening 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d3

C56 Open Variation, Two Knights Defense; C56 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4

C56 Perreux Variation, Two Knights Defense 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.Ng5

C56 Scotch Gambit 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O

C56 Max Lange Attack 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6.e5

C56 Loman Defense, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be6 9.Ng5 g6

C56 Marshall Variation, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Bc5 6.e5 d5 7.exf6 dxc4 8.Re1+ Be7 9.Ng5 Qd5 10.Nc3 Qf5

C56 Double Gambit Accepted, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Nxe4

C56 Nachmanson Gambit, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Nxe4 6.Nc3

C56 Jordansky Attack, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.d4 exd4 5.O-O Nxe4 6.Re1 d5 7.Bxd5 Qxd5 8.Nc3 Qa5 9.Ne4 Be6 10.Bg5

C57 Prussian Game; Knight Attack, Two Knights; C57 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5

C57 Traxler; Wilkes-Barre Var, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5

C57 Trencianske-Teplice Gambit, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Bxf7+ Ke7 6.d4

C57 Ulvestad Variation, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5

C57 Kurkin Gambit, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 b5 6.Bf1 h6 7.Nxf7

C57 Kloss Gambit, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nb4

C57 Fritz Variation, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nd4

C57 Berliner Variation, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nd4 6.c3 b5 7.Bf1 Nxd5 8.Ne4 Qh4

C57 Lolli Attack, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.d4

C57 Fried Liver; Fegatello Attack, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Nxd5 6.Nxf7

C57 Ponziani-Steintz Gambit, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Nxe4

C58 Polerio Defense, Two Knights; C58 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5

C58 Bogoljubow Variation, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3

C58 Colman Variation, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Qf3 Rb8

C58 Kieseritzky; Morphy Var, 2 Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.d3

C58 Yankovich Variation, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.d3 h6 7.Nf3 e4 8.Qe2 Nxc4 9.dxc4 Bc5 10.Nfd2

C59 C59 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2

C59 Suhle Defense, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2 h6

C59 Goering Variation, Two Knights 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 d5 5.exd5 Na5 6.Bb5+ c6 7.dxc6 bxc6 8.Be2 h6 9.Nf3 e4 10.Ne5

C60 Ruy Lopez; Spanish Opening; C60 1.e4 e5 2.Nf3 Nc6 3.Bb5

C60 Bulgarian Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a5

C60 Rotary-Albany Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 b6

C60 Alapin Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bb4

C60 Alapin Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bb4 4.c3 Ba5 5.Bxc6 dxc6

C60 Lucena Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Be7

C60 Sawyer's Gambit, Ruy Lopez; Spanish Countergambit 1.e4 e5 2.Nf3 Nc6 3.Bb5 d5

C60 Harding Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 d5 4.Nxe5 Qg5 5.Nxc6

C60 Fricke Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 d5 4.Nxe5 Qg5 5.O-O

C60 Nuremberg Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f6

C60 Brentano Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 g5

C60 Barnes; Smyslov; Fianchetto Var, Ruy 1.e4 e5 2.Nf3 Nc6 3.Bb5 g6

C60 Retreat Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nc8

C60 Cozio Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7

C60 Tartakower Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7 4.d4 exd4 5.Nxd4 g6 6.Nc3 Bg7 7.Be3 O-O 8.Qd2 d5

C60 Paulsen Variation, Cozio Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nge7 4.Nc3 g6

C60 Vinogradov Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Qe7

C60 Frankfort; Gunderam Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Qf6

C61 Bird Defense, Ruy Lopez; C61 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4

C61 Paulsen Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nd4 4.Nxd4 exd4 5.O-O Ne7

C62 Steinitz Defense, Ruy Lopez; C62 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6

C62 Nimzovich Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 Bd7 4.Nc3 Nf6 5.Bxc6

C62 Center Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 d6 4.d4 exd4 5.O-O

C63 Schliemann; Jaenisch Var, Ruy Lopez; C63 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5

C63 Exchange Variation, Schliemann Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Bxc6

C63 Schoenemann Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.d4

C63 Jaenisch Gambit Accepted, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.exf5

C63 Berger (Dyckhoff) Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3

C63 Kostic Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 Be7

C63 Moehring Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 d5 6.Nxe5 dxe4 7.Nxc6 Qd5

C63 Tartakower Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 fxe4 5.Nxe4 Nf6

C63 Soviet Youth Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 Nd4 5.O-O

C63 Kostic Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 f5 4.Nc3 Nf6 5.exf5 Bc5

C64 Classical; Cordel Var, Ruy Lopez; C64 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5

C64 Spanish Wing Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.b4

C64 Charousek Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Bb6

C64 Konikowski Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 d5

C64 Cordel Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 f5

C64 Benelux Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Nf6 5.d4 Bb6 6.O-O O-O

C64 Boden Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.c3 Qe7

C64 Zaitsev Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.O-O Nd4 5.b4

C64 Zukertort Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Bc5 4.O-O Nf6 5.c3

C65 Berlin Defense, Ruy Lopez; C65 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6

C65 Kaufmann Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Bc5 5.Be3

C65 Anderssen Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 d6 5.Bxc6+

C65 Duras Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 d6 5.c4

C65 Mortimer Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Ne7

C65 Mortimer Trap, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d3 Ne7 5.Nxe5 c6

C65 Nyholm Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.d4 exd4 5.O-O

C65 Beverwijk Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Bc5

C66 Improved Steinitz Defense, Ruy Lopez; C66 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6

C66 Hedgehog Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6 5.d4 Bd7 6.Nc3 Be7

C66 Closed Bernstein Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6 5.d4 Bd7 6.Nc3 Be7 7.Bg5

C66 Closed Showalter Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6 5.d4 Bd7 6.Nc3 Be7 7.Bxc6

C66 Tarrasch Trap, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6 5.d4 Bd7 6.Nc3 Be7 7.Re1 O-O

C66 Closed Wolf Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O d6 5.d4 Bd7 6.Nc3 exd4

C66 Fishing Pole Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Ng4

C67 Rio Gambit Accepted, Ruy Lopez; C67 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4

C67 Rosenthal Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 a6

C67 Rio de Janeiro Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7

C67 Minckwitz Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.dxe5

C67 Trifunovic Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 d5

C67 Pillsbury Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6+ bxc6 8.dxe5 Nb7 9.b3

C67 Zukertort Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6+ bxc6 8.dxe5 Nb7 9.c4

C67 Berlin; Rio de Janerio Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6+ bxc6 8.dxe5 Nb7 9.Nc3 O-O 10.Re1

C67 Winawer Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6+ bxc6 8.dxe5 Nb7 9.Nd4 O-O

C67 Cordel Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Be7 6.Qe2 Nd6 7.Bxc6+ bxc6 8.dxe5 Nf5

C67 L'Hermet Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Nd6

C67 Westerinen Line, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 Nf6 4.O-O Nxe4 5.d4 Nd6 6.Bxc6 dxc6 7.dxe5 Ne4

C68 Morphy Defense, Ruy Lopez; C68 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6

C68 Exchange Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6

C68 Lutikov Variation, Ruy Lopez Exchange 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 bxc6

C68 Keres Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 bxc6 5.Nc3

C68 Romanovsky Variation, Ruy Lopez Exchange 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 bxc6 5.Nc3 f6 6.d3

C68 Alekhjne Variation, Ruy Lopez Exchange 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.d4 exd4 6.Qxd4 Qxd4 7.Nxd4 Bd6

C68 Barendregt-Fischer Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O

C68 King's Bishop Variation, Ruy Lopez Exchange 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O Bd6

C68 Alapin Gambit, Ruy Lopez Exchange 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O Bg4 6.h3 h5

C69 Gligoric Variation, Ruy Lopez; C69 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O f6

C69 Bronstein Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Bxc6 dxc6 5.O-O Qd6

C70 Morphy Defense, Ruy Lopez; C70 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4

C70 Caro Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5

C70 Graz Variation, Ruy 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Bc5

C70 Furman-Taimanov; Wing Var, Ruy; Norwegian Variation 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Na5

C70 Nightingale Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 b5 5.Bb3 Na5 6.Bxf7+

C70 Alapin's Defense Deferred, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Bb4

C70 Classical Defense Deferred, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Bc5

C70 Schliemann Defense Deferred, Ruy 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 f5

C70 Jaenisch Gambit Deferred, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 f5 5.exf5

C70 Cozio Defense Deferred, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nge7

C71 Steinitz Defense Deferred; Ruy Lopez; C71 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6

C71 Modern Steinitz Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6

C71 Keres Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c4

C71 Noah's Ark Trap, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.d4 b5 6.Bb3 exd4 7.Nxd4 Nxd4 8.Qxd4 c5 9.Qd5 Be6 10.Qc6+ Bd7

C72 C72 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.O-O

C73 C73 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6

C73 Richter Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6 6.d4

C73 Alapin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.Bxc6+ bxc6 6.d4 f6

C74 C74 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3

C74 Siesta Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5

C74 Kopaiev Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 f5 6.exf5 Bxf5 7.O-O

C75 C75 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7

C76 C76 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 d6 5.c3 Bd7 6.d4 g6

C77 C77 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6

C77 Treybel; Flohr; Exchange Var Deferred 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Bxc6

C77 Bayreuth Variation, ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Bxc6

C77 Jaffe Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.c3

C77 Anderssen Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d3

C77 Duras Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d3 d6 6.c4

C77 Mackenzie Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d4

C77 Center Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.d4 exd4

C77 Nimzovich; Tarrasch Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Nc3

C77 Wormald Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.Qe2

C78 Normal Variation, Ruy Lopez; C78 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O

C78 Arkangelsk; Counterthrust Var, Ruy 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5

C78 Shannon Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 6.Bb3 Bb7 7.Ng5 d5

C78 Wing Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 6.Bb3 Be7 7.a4

C78 Neo-Steinitz Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O b5 6.Bb3 d6

C78 Moeller Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Bc5

C79 Central Countergambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O d5

C79 Russian Defense, Ruy Lopez; C79; Lasker Defense 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O d6

C79 Brix Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O g6

C80 Tarrasch; Open Variation, Ruy Lopez; C80 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4

C80 Schlechter Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.a4 Nxd4

C80 Berger Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.a4 Nxd4 9.Nxd4 exd4 10.Nc3

C80 Harksen Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.c4

C80 Bernstein Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2

C80 Karpov Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Nbd2 Nc5 10.c3 d4

C80 Zukertort Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Ne7

C80 Richter Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.d5

C80 Friess Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Nxe5

C80 Riga Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 exd4

C80 Knoore Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.Nc3

C80 Tartakower Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.Qe2

C80 Skipworth Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.Re1 d5

C81 Keres; Estonian; Howell; Moscow Var 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6

C81 Howell Attack, Ruy Lopez; C81 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2

C81 Adam Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Be7 10.c4

C81 Ekstrom Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.Qe2 Be7 10.Rd1 O-O 11.c4

C82 C82 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3

C82 Italian Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5

C82 St Petersburg Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Nbd2

C82 Dilworth; Kleczynski Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Nbd2 O-O 11.Bc2

C82 Motzko Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Qd3

C82 Nenarokov Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Bc5 10.Qd3 Ne7

C82 Berlin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Nc5

C83 Malkin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5

C83 C83 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7

C83 Breslau Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Nxe4 6.d4 b5 7.Bb3 d5 8.dxe5 Be6 9.c3 Be7 10.Re1 O-O 11.Nd4

C84 Closed Defense, Ruy Lopez; C84 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7

C84 Center Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.d4

C84 Basque Gambit, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.d4 exd4 7.e5 Ne4 8.c3

C84 Lopez Four Knights, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Nc3

C85 Delayed Exchange Ruy Lopez Deferred; C85 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Bxc6

C86 Worrall Attack, Ruy Lopez; C86 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Qe2

C86 Schlechter Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Qe2 b5 7.Bb3 O-O 8.c3 d5

C86 English Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Qe2 b5 7.Bb3 O-O 8.c3 d6 9.d4 Bg4

C87 C87 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1

C87 Averbakh Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 d6

C87 Kecskemet; Timbuktu Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 d6 7.c3 O-O 8.d4 Bd7 9.Nbd2 Be8

C87 Romanovsky Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 d6 7.c3 O-O 8.d4 Bd7 9.Nbd2 exd4 10.cxd4 Nb4

C88 C88 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3

C88 Trajkovic Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 Bb7

C88 Pseudo-Marshall Var, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 Bb7 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5

C88 Rosen Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.d4

C88 Anti-Marshall Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.a4

C89 C89 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3

C89 Marshall Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5

C89 Marshall Counter-Attack, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.d4

C89 Steiner Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.exd5 e4

C89 Kevitz Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.Bxd5 cxd5 13.d4 Bd6 14.Re3

C89 Geller Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.d4 Bd6 13.Re1 Qh4 14.g3 Qh3

C89 Fischer Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d5 9.exd5 Nxd5 10.Nxe5 Nxe5 11.Rxe5 c6 12.g3

C90 C90 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6

C90 Balla Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 Na5 9.Bc2 c5 10.d4 Qc7

C90 Suetin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.a3

C90 Lutikov Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.Bc2

C90 Pilnik Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.d3

C90 Suetin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d6 9.a3

C90 Lutikov Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 d6 9.Bd2

C90 Leonhardt Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.c3 Na5 9.Bc2 c5 10.d4 Qc7 11.h3 Nc6 12.d5 Nd8 13.Nbd2 g5

C91 Yates Variation, Ruy; C91 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.d4

C91 Bogoljubow; Counterthrust Var, Ruy 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.d4 Bg4

C92 C92 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3

C92 Keres Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 a5

C92 Flohr; Zaitsev; Lenzerheide Var, Ruy 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Bb7

C92 Kholmov Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Be6

C92 Spanish Benoni, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.d5

C92 Keres Defense, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nd7

C92 Zaitsev System, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Re8

C93 Smyslov Variation, Ruy Lopez; C93 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 h6

C94 Breyer; Retreat Variation, Ruy Lopez; C94 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8

C95 C95 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4

C95 Borisenko Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4 Nbd7

C95 Arseniev Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4 Nbd7 11.c4

C95 Romanishin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4 Nbd7 11.Nbd2 Bb7 12.Bc2 Re8 13.Nf1 Bf8 14.Bg5

C95 Simagin Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Nb8 10.d4 Nbd7 11.Nh4

C96 C96 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5

C96 Borisenko Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Nc6

C96 Keres Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Nd7

C97 Chigorin Variation, Ruy Lopez; C97 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7

C97 Classical Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2

C98 C98 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6

C98 Rauzer Variation, Ruy Lopez 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 Nc6 13.dxe5 dxe5 14.a4

C99 C99 1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 d6 8.c3 O-O 9.h3 Na5 10.Bc2 c5 11.d4 Qc7 12.Nbd2 cxd4

D00 Queen Pawn Game; Close Opening; D00 1.d4 d5

D00 Sarratt Attack 1.d4 d5 2.Bf4

D00 Steinitz Countergambit, Queen Pawn Game 1.d4 d5 2.Bf4 c5

D00 Morris Gambit 1.d4 d5 2.Bf4 c5 3.e4

D00 Morris Counter-Gambit 1.d4 d5 2.Bf4 c5 3.e4 dxe4

D00 Bishop Attack; Levitsky Attack, Queen Pawn Game 1.d4 d5 2.Bg5

D00 Zot 1.d4 d5 2.Bg5

D00 Welling Variation, Queen Pawn Game 1.d4 d5 2.Bg5 Bg4

D00 Euwe Variation, Queen Pawn Game 1.d4 d5 2.Bg5 h6 3.Bh4 c6 4.Nf3 Qb6

D00 Stonewall Attack, Queen Pawn Game 1.d4 d5 2.e3 Nf6 3.Bd3

D00 Stonewall Attack 1.d4 d5 2.e3 Nf6 3.Bd3 c5 4.c3

D00 Blackmar-Diemer Gambit 1.d4 d5 2.e4

D00 Fritz Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Bc4

D00 Diemer-Rosenberg Attack, BDG 1.d4 d5 2.e4 dxe4 3.Be3

D00 Blackmar Gambit; Gedult Gambit 1.d4 d5 2.e4 dxe4 3.f3

D00 Pohlmann Variation, BDG 1.d4 d5 2.e4 dxe4 3.f3 f5

D00 Mieses; Nimzovich Var, BDG 1.d4 d5 2.e4 dxe4 3.f3 Nc6

D00 Polish Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3

D00 Grosshans Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Bd7

D00 Zeller Defesne, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5

D00 Zeller Defesne, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5 4.f3 exf3 5.Qxf3 Bc8

D00 Soller Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Bf5 4.f3 Nf6 5.Bc4

D00 Dries Counter-Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 c5

D00 Lemberger Counter-Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e5

D00 Soller; Lemberger Var, BDG; Diemer Attack 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Be3

D00 Endgame Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.dxe5

D00 Rasmussen Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nge2

D00 Lange Gambit; Alfred Lange Gambit; Simple Variation 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Nxe4

D00 Sneiders Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e5 4.Qh5

D00 Rasa-Studier Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e6 4.Be3

D00 Giertz-Peters Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e6 4.f3

D00 Polish Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 e6 4.f3 Bf5 5.Bg5

D00 Netherlands Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 f5

D00 Mieses; Nimzovich Var, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nc6

D00 Vienna Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6

D00 Studier-Rasa Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Be3

D00 Von Popiel Gambit 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Bg5

D00 Zilbermints Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.Bg5 Bf5 5.Bxf6 exf6 6.g4 Bg6 7.Qe2 Bb4 8.Qb5+

D00 Blackmar-Diemer Gambit 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3

D00 Wiesengren Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bc5

D00 Hans Mullers; Vienna V 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5

D00 Soller; Vienna Var, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.Bc4

D00 Tejler Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.Bf4

D00 Sperling Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.d5

D00 Diemer Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.fxe4

D00 Kampars Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.g4 Bg6 6.g5 Nd5 7.fxe4

D00 Gunderam Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Bf5 5.g4 Bg6 6.h4

D00 Brombacher; Daberitz Var, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c5

D00 O'Kelly Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 c6

D00 Langeheinecke Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e3

D00 Elbert Counter-Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e5

D00 Weinsbach Declination, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e6

D00 Pfrang Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 e6 5.fxe4 Bb4 6.Bd3 Bxc3+ 7.bxc3 Nxe4 8.Be3

D00 Ritter Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 b6

D00 Gunderam; Tartakower Var, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bf5

D00 Teichmann Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Bg4

D00 Kaulich Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c5

D00 Ziegler; Gunderam's 2nd Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 c6

D00 Euwe Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 e6

D00 Zilbermints Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 e6 6.Bg5 Be7 7.Bd3 Nc6 8.O-O Nxd4 9.Kh1

D00 Duthilleuk Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 e6 6.Bd3 Nc6 7.Bg5 Be7 8.Ne4

D00 Bogoljubow Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6

D00 Mad Dog Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.h4

D00 Nimzovich Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.Ne5

D00 Kloss Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.O-O O-O 8.Kh1

D00 Studier Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bc4 Bg7 7.O-O O-O 8.Qe1

D00 Diemer Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Bf4

D00 Peters Attack, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 g6 6.Ne5

D00 Gunderam Defense, BDG; Rook Pawn Defense 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 h5

D00 Schuttler Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Nbd7

D00 Pietrowsky Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Nxf3 Nc6

D00 Ryder Variation, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3

D00 Tautvaisis Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3 Nc6

D00 Tejler Gambit, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 exf3 5.Qxf3 Qxd4 6.Be3 Qg4 7.Qf2 Ne4 8.Nxe4 Qxe4 9.O-O-O Nc6 10.Bd3

D00 Albrecht; Karlshruhle Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 g6

D00 Lamb Defense, BDG 1.d4 d5 2.e4 dxe4 3.Nc3 Nf6 4.f3 Nc6

D00 Mason Attack, Queen Pawn Game 1.d4 d5 2.f4

D00 Zurich Gambit 1.d4 d5 2.g4

D00 Chigorin; Ponziani; Veresov 1.d4 d5 2.Nc3

D00 Alburt Defense, QP 1.d4 d5 2.Nc3 Bf5

D00 Anti-Veresov 1.d4 d5 2.Nc3 Bg4

D00 Irish Gambit, QP 1.d4 d5 2.Nc3 c5

D00 Shaviliuk Gambit, QP 1.d4 d5 2.Nc3 e5

D00 Dutch System, QP 1.d4 d5 2.Nc3 f5

D00 Fianchetto Defense, QP 1.d4 d5 2.Nc3 g6 3.Nf3 Bg7

D00 Shropshire Defense 1.d4 d5 2.Nc3 h5

D00 Hubsch Gambit 1.d4 d5 2.Nc3 Nf6 3.e4 Nxe4

D00 Amazon Attack 1.d4 d5 2.Qd3

D00 Siberian Attack 1.d4 d5 2.Qd3 Nc6 3.Nc3

D01 Betbeder; Veresov; Levitzky; Parisian 1.d4 d5 2.c4 dxc4 3.e4 f5

D01 Richter-Veresov Opening; D01 1.d4 d5 2.Nc3 Nf6 3.Bg5

D01 Veresov Variation, QP 1.d4 d5 2.Nc3 Nf6 3.Bg5 Bf5 4.Bxf6

D01 Richter Variation, Veresov 1.d4 d5 2.Nc3 Nf6 3.Bg5 Bf5 4.f3

D01 Classical Defense, Veresov 1.d4 d5 2.Nc3 Nf6 3.Bg5 e6 4.Nf3

D01 Two Knights System, Veresov 1.d4 d5 2.Nc3 Nf6 3.Bg5 Nbd7 4.Nf3

D01 Gruenfeld Defense, Veresov 1.d4 d5 2.Nc3 Nf6 3.Bg5 Nbd7 4.Nf3 g6

D01 Boyce Defense, Veresov 1.d4 d5 2.Nc3 Nf6 3.Bg5 Ne4

D02 Zukertort Variation, QP; D02 1.d4 d5 2.Nf3

D02 Anti-Torre, QP 1.d4 d5 2.Nf3 Bg4

D02 Anti-Torre 1.d4 d5 2.Nf3 Bg4 3.Ne5 Bf5 4.g4

D02 Queen's Gambit Reversed; Krause Variation 1.d4 d5 2.Nf3 c5

D02 Chandler Gambit, QP 1.d4 d5 2.Nf3 c5 3.g3 cxd4 4.Bg2

D02 Chigorin Variation, QP 1.d4 d5 2.Nf3 Nc6

D02 Symmetrical Variation, QP 1.d4 d5 2.Nf3 Nf6

D02 London System; Queen's Bishop Opening 1.d4 d5 2.Nf3 Nf6 3.Bf4

D02 Poisoned Pawn Variation, QP 1.d4 d5 2.Nf3 Nf6 3.Bf4 c5 4.e3 Qb6 5.Nc3

D02 Zilbermints Variation, QP 1.d4 d5 2.Nf3 Nf6 3.c4 b5

D02 Pseudo-Catalan 1.d4 d5 2.Nf3 Nf6 3.g3

D02 Barry Attack 1.d4 Nf6 2.Nf3 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.Be2

D03 Torre Attack, QP; D03 1.d4 d5 2.Nf3 Nf6 3.Bg5

D03 Breyer Variation, QP 1.d4 d5 2.Nf3 Nf6 3.Bg5 e6 4.e3 c5 5.c3 Qb6

D03 Gruenfeld Variation, QP 1.d4 d5 2.Nf3 Nf6 3.Bg5 g6

D03 Gossip Variation, QP 1.d4 d5 2.Nf3 Nf6 3.Bg5 Ne4

D04 Colle System; D04 1.d4 d5 2.Nf3 Nf6 3.e3

D04 Bishop Defense, QP; Anti-Colle 1.d4 d5 2.Nf3 Nf6 3.e3 Bf5

D05 Classical Defense, Colle System; D05 1.d4 d5 2.Nf3 Nf6 3.e3 e6

D05 Zukertort Variation, QP 1.d4 d5 2.Nf3 Nf6 3.e3 e6 4.Bd3

D05 Rubinstein Attack, Colle 1.d4 d5 2.Nf3 Nf6 3.e3 e6 4.Bd3 c5 5.b3

D06 Queen's Gambit; Aleppo Gambit; D06 1.d4 d5 2.c4

D06 Zilbermints Gambit, QGD 1.d4 d5 2.c4 b5

D06 Brieger Defense; Sahovic Defense, QGD; Baltic Defense 1.d4 d5 2.c4 Bf5

D06 Pseudo-Slav, QGD 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Nf3 c6

D06 Pseudo-Chigorin, QGD 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Nf3 Nc6

D06 Queen Attack, Baltic Defens, QGD 1.d4 d5 2.c4 Bf5 3.Nc3 e6 4.Qb3

D06 Austrian Defense; Summetrical Defense, QGD 1.d4 d5 2.c4 c5

D06 Gusev Countergambit, QGD 1.d4 d5 2.c4 c5 3.cxd5 Nf6

D06 Haberditz Variation, QGD 1.d4 d5 2.c4 c5 3.cxd5 Nf6 4.e4 Nxe4 5.dxc5 Qa5+

D06 Salvio Countergambit, QGD 1.d4 d5 2.c4 c5 3.dxc5 d4

D06 Alekhine Defense, QGD 1.d4 d5 2.c4 g6

D06 Tartakower Gambit, QGD 1.d4 d5 2.c4 Nc6 3.Nc3 e5

D06 Modern Gambit, Chigorin Defense 1.d4 d5 2.c4 Nc6 3.Nc3 Nf6 4.Nf3 dxc4

D06 Alekhine Variation, Chigorin Defense 1.d4 d5 2.c4 Nc6 3.Nf3 Bg4 4.Qa4

D06 Lazard Gambit, Chigorin Defense 1.d4 d5 2.c4 Nc6 3.Nf3 e5

D06 Marshall Defense; Knight Defense, QGD 1.d4 d5 2.c4 Nf6

D06 Cocquio Counter Gambit, QGD; Tan Gambit 1.d4 d5 2.c4 Nf6 3.cxd5 c6

D07 Chigorin Defense, QGD; D07 1.d4 d5 2.c4 Nc6

D07 Exchange Variation, Chigorin Defense 1.d4 d5 2.c4 Nc6 3.cxd5 Qxd5

D07 Costa's Line 1.d4 d5 2.c4 Nc6 3.cxd5 Qxd5 4.e3 e5 5.Nc3 Bb4 6.Bd2 Bxc3 7.Bxc3 exd4 8.Ne2

D07 Janowski Variation, QGD 1.d4 d5 2.c4 Nc6 3.Nc3 dxc4 4.Nf3

D08 Albin Countergambit; Cavalotti Var, QGD; D08 1.d4 d5 2.c4 e5

D08 Lasker Trap, QGD 1.d4 d5 2.c4 e5 3.dxe5 d4 4.e3 Bb4+ 5.Bd2 dxe3

D08 Normal Line, Albin Countergambit, QGD 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3

D08 Tartakower Defense, QGD 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 c5

D08 Alapin Variation, QGD 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.Nbd2

D09 Fianchetto Variation, Albin Countergambit; D09 1.d4 d5 2.c4 e5 3.dxe5 d4 4.Nf3 Nc6 5.g3

D10 Slav Defense; Czech Defense, QGD; D10 1.d4 d5 2.c4 c6

D10 Exchange Variation, Slav 1.d4 d5 2.c4 c6 3.cxd5

D10 Slav Pawn Game 1.d4 d5 2.c4 c6 3.e3

D10 Diemer Gambit, Slav 1.d4 d5 2.c4 c6 3.e4

D10 Alekhine Attack, Slav 1.d4 d5 2.c4 c6 3.Nc3 dxc4 4.e4

D10 Winawer Counter Gambit, Slav 1.d4 d5 2.c4 c6 3.Nc3 e5

D10 Anti-Winawer Gambit, Slav 1.d4 d5 2.c4 c6 3.Nc3 e5 4.e4

D11 Modern Line, Slav; D11 1.d4 d5 2.c4 c6 3.Nf3

D11 Slav Bishop's Game 1.d4 d5 2.c4 c6 3.Nf3 Bf5

D11 Bonet Gambit, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Bg5

D11 Quiet Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3

D11 Breyer Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nbd2

D12 Schallopp Defense, Slav; D12 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5

D12 Amsterdam Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Nc3

D12 Rotterdam Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Qb3

D12 Landau Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.cxd5 cxd5 6.Qb3 Qc8 7.Bd2 e6 8.Na3

D12 Pin Defense, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bg4

D13 Exchange Variation, Slav; D13 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5

D14 Symmetrical Line, Slav; D14 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Nc3 Nc6 6.Bf4 Bf5

D14 Trifunovic Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.cxd5 cxd5 5.Nc3 Nc6 6.Bf4 Bf5 7.e3 e6 8.Qb3 Bb4

D15 Three Knights Variation, Slav; D15 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3

D15 Chameleon Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6

D15 Advance System, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 a6 5. c5

D15 Two Knights Attack, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4

D15 Alekhine Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e3

D15 Alekhine Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e3 b5 6.a4 b4

D15 Geller Variation; Geller-Tolush Var, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.e4

D15 Schlechter Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 g6

D15 Suchting Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 Qb6

D16 Alapin Variation, Slav; D16 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4

D16 Steiner Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bg4

D16 Soultanbeieff Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 e6

D16 Smyslov Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Na6

D17 Czech Defense; Open Slav Defense; D17 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5

D17 Krause Attack, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5

D17 Wiesbaden Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 e6

D17 Sharp Line, Wiesbaden Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 e6 7.f3 Bb4 8.e4

D17 Fazekas Gambit, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Na6 7.e4

D17 Carlsbad Variation, Slav 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Ne5 Nbd7 7.Nxc4 Qc7 8.g3 e5

D17 Baarn Variation, Slav; Bled Attack 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.Nh4

D18 Dutch Variation, Slav; D18 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3

D18 Mareschall Variation, Slav; Lasker Variation 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 Na6

D19 Main Line, Czech Variation, Slav; D19 1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.Nc3 dxc4 5.a4 Bf5 6.e3 e6 7.Bxc4 Bb4 8.O-O O-O 9.Qe2

D20 Queen's Gambit Accepted; D20 1.d4 d5 2.c4 dxc4

D20 Old Variation, QGA 1.d4 d5 2.c4 dxc4 3.e3

D20 Billinger Gambit, QGA 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bc4 exd4 5.Qb3 Qe7 6.a3

D20 Korchnoi Gambit, QGA 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bc4 exd4 5.Qb3 Qe7 6.Kf1

D20 Novikov Gambit, QGA 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bc4 exd4 5.Qb3 Qe7 6.Nd2

D20 Christensen Gambit, QGA 1.d4 d5 2.c4 dxc4 3.e3 e5 4.Bc4 exd4 5.Qb3 Qe7 6.Nf3

D20 Saduleto Variation, QGA; Central Variation, QGA 1.d4 d5 2.c4 dxc4 3.e4

D20 Greco Variation, QGA 1.d4 d5 2.c4 dxc4 3.e4 b5

D20 Rubinstein Variation, QGA 1.d4 d5 2.c4 dxc4 3.e4 c5

D20 Yefimov Gambit, QGA 1.d4 d5 2.c4 dxc4 3.e4 c5 4.d5 b5

D20 Linares Variation, QGA 1.d4 d5 2.c4 dxc4 3.e4 c5 4.d5 Nf6 5.Nc3 b5

D20 McDonnell Defense, QGA 1.d4 d5 2.c4 dxc4 3.e4 e5

D20 Somov Gambit, QGA 1.d4 d5 2.c4 dxc4 3.e4 e5 4.Bxc4

D20 Versov; Betbeder; Schwartz Defense, QGA 1.d4 d5 2.c4 dxc4 3.e4 f5

D20 Modern Defense, QGA 1.d4 d5 2.c4 dxc4 3.e4 Nc6

D20 Alekhine System, QGA 1.d4 d5 2.c4 dxc4 3.e4 Nf6

D20 Gunsberg Defense; Prianishenmo Gambit, QGA 1.d4 d5 2.c4 dxc4 3.Nc3 c5 4.d5 Nf6 5.Nc3 e6 6.e4 exd5 7.e5

D21 Blackburne's Move, QGA; Normal Variation, QGA; D21 1.d4 d5 2.c4 dxc4 3.Nf3

D21 Alekhine Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 a6

D21 Slav Gambit, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 b5

D21 Gunsberg Defense, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 c5

D21 Prianishenmo Gambit, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 c5 4.d5 Nf6 5.Nc3 e6 6.e4 exd5 7.e5

D21 Rosenthal Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 e6

D21 Godes Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nd7

D22 D22 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3

D22 Haberditz Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 b5

D22 Alekhine Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e3 Bg4

D22 Borisenko-Furman Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 a6 4.e4

D23 D23 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6

D23 Mannheim Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Qa4+

D24 Showalter Variation, QGA; D24 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Nc3

D24 Bogoljubow Defense, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.Nc3 a6 5.e4

D25 D25 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3

D25 Flohr; Winawer Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Be6

D25 Larsen; Janowski; Modern Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 Bg4

D25 Smyslov Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 g6

D25 Queen's Gambit Accepted Deferred 1.d4 d5 2.Nf3 Nf6 3.c4 dxc4

D26 Traditional System QGA; D26 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6

D26 Classical Defense, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5

D26 Steinitz Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O cxd4

D26 Development Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O Nc6

D27 Rubinstein Variation, QGA; D27 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6

D27 Furman Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.dxc5 Bxc5

D27 Russian Gambit, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.e4

D28 Alekhine System, Classical Defense, QGA; D28 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2

D28 Accelerated Fianchetto, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5

D28 Counter Fianchetto Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 Nc6 8.dxc5

D28 Four Knights Variation, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 Nc6 8.Nc3

D29 D29 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 8.Bb3 Bb7

D29 Smyslov Variation, Classical Defense, QGA 1.d4 d5 2.c4 dxc4 3.Nf3 Nf6 4.e3 e6 5.Bxc4 c5 6.O-O a6 7.Qe2 b5 8.Bb3 Bb7 9.Rd1 Nbd7 10.Nc3 Bd6

D30 D30 1.d4 d5 2.c4 e6

D30 Pseudo-Tarrasch, QGD 1.d4 d5 2.c4 e6 3.Nf3 c5

D30 Bishop Attack, Tarrasch 1.d4 d5 2.c4 e6 3.Nf3 c5 4.cxd5 exd5 5.Bg5

D30 Anti-Noteboom Gambit, Semi-Slav 1.d4 d5 2.c4 e6 3.Nf3 c6 4.Nc3 dxc4 5.g3

D30 Traditional Variation, QGD 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Bg5

D30 Vienna Variation, QGD 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Bg5 Bb4+

D30 Duras Variation, QGD; Capablanca Variation 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Bg5 h6

D30 Hastings Variation, QGD 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Bg5 h6 5.Bxf6 Qxf6 6.Nc3 c6 7.Qb3

D30 Capablanca Variation, QGD 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nbd2

D30 Pseudo-Meran; Semi-Slav, QGD 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.e3 c6

D30 Quiet Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.e3 c6 5.Nbd2

D30 Semmering Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nf3 Nf6 4.e3 c6 5.Nbd2 Nbd7 6.Bd3 c5

D31 Baltic Defense, QGD 1.d4 d5 2.c4 Bf5 3.cxd5 Bxb1 4.Qa4+ c6 5.dxc6 Nxc6

D31 Argentinian Gambit, QGD 1.d4 d5 2.c4 Bf5 3.cxd5 Bxb1 4.Qa4+ c6 5.dxc6 Nxc6 6.Rxb1 Qxd4

D31 Queen's Knight Variation, QGD; D31 1.d4 d5 2.c4 e6 3.Nc3

D31 Janowski Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 a6

D31 Alapin Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 b6

D31 Alatortsev; Petrosian, Charousek Var, QGD 1.d4 d5 2.c4 e6 3.Nc3 Be7

D31 Miladinovic Gambit, QGD 1.d4 d5 2.c4 e6 3.Nc3 Be7 4.e4 dxe4 5.f3

D31 Semi-Slav Defense 1.d4 d5 2.c4 e6 3.Nc3 c6

D31 Portisch Gambit, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e3 f5 5.g4

D31 Marshall Gambit, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4

D31 Gunderam Gambit, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.f3

D31 Tolush Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.e4 dxe4 5.Nxe4 Bb4+ 6.Bd2 Qxd4 7.Bxb4 Qxe4+8.Be2 c5 9.Bxc5 Qxg2

D31 Noteboom Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4

D31 Abrahams; Noteboom; Klaus Junge Var, QGD 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.a4 Bb4 6.e3 b5 7.Bd2 a5

D31 Anti-Noteboom Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5

D31 Beliavsky Line, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 c6 4.Nf3 dxc4 5.Bg5 f6

D32 Tarrasch Defense, QGD; D32 1.d4 d5 2.c4 e6 3.Nc3 c5

D32 Schara-Hennig; Duisburg Gambit, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd4

D32 Von Hennig Gambit, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 cxd4 5.Qxd4 Nc6 6.Qd1 exd5 7.Qxd5 Be6

D32 Tarrasch Gambit, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.dxc5 d4 6.Na4 b5

D32 Marshall Gambit, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.e4

D32 Two Knights Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3

D32 Gruenfeld Gambit, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.dxc5 d4 7.Na4 b5

D32 Symmetrical Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.e3 Nf6 5.Nf3 Nc6

D33 Lodz; Schlecter; Rubinstein Var, QGD; D33 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3

D33 Folkestone; Swedish Var, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 c4

D33 Prague Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6

D33 Wagner Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Bg4

D34 D34 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7

D34 Rubinstein; Normal Position, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O

D34 Carlsbad Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5

D34 Endgame Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5 Be6

D34 Bogoljubow Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5 Be6 10.Rc1 c4

D34 Advance Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5 c4

D34 Spassky Variation, Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.Bg5 cxd4 10.Nxd4

D34 Reti Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.dxc5 Bxc5 10.Na4

D34 Classical Tarrasch Gambit 1.d4 d5 2.c4 e6 3.Nc3 c5 4.cxd5 exd5 5.Nf3 Nc6 6.g3 Nf6 7.Bg2 Be7 8.O-O O-O 9.dxc5 d4

D35 D35 1.d4 d5 2.c4 e6 3.Nc3 Nf6

D35 Harrwitz; Rubinstein Var, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bf4

D35 Exchange Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5

D35 Positional Variation, Exchange Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5

D35 Saemisch Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Nf3 Nbd7 6.Bf4

D36 Reshevsky Variation, QGD; D36 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.cxd5 exd5 5.Bg5 c6 6.Qc2

D37 Three Knights Variation, QGD; D37 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3

D37 Harrwitz Attack, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Be7 5.Bf4

D38 Ragozin Variation, QGD; D38 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Bb4

D38 Alekhine Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Bb4 5.Qa4

D39 Vienna Variation, QGD; D39 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 Bb4 5.Bg5 dxc4

D40 Semi-Tarrasch Variation, QGD; D40 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5

D40 Pillsbury Variation, Semi-Tarrasch 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.Bg5

D41 D41 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5

D41 San Sebastian Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e4 Nxc3 7.bxc3 cxd4 8.cxd4 Bb4+ 9.Bd2 Bxd2+

D42 D42 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c5 5.cxd5 Nxd5 6.e3 Nc6 7.Bd3

D43 D43 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6

D43 Anti-Meran Gambit, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5

D44 Semi-Slav Defense Accepted; D44 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4

D44 Botvinnik Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4 6.e4 b5

D44 Ekstrom Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.exf6 gxh4 10.Ne5

D44 Lilienthal Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 hxg5 10.Bxg5 Nbd7

D44 Alatortsev System, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 dxc4 6.e4 b5 7.e5 h6 8.Bh4 g5 9.Nxg5 Nd5

D44 Anti-Moscow Gambit 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.Bg5 h6 6.Bh4

D44 Stonewall Defense, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Ne4 6.Bd3 f5

D44 Vienna Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 dxc4

D45 D45 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3

D45 Acclerated Meran, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 a6

D45 Normal Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7

D45 Rubinstein; anti-Meran 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Ne5

D45 Stoltz Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Qc2

D45 Center Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Qc2 Bd6 7.e4

D45 Mikhalchishin Line, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Qc2 Bd6 7.e4 dxe4 8.Nxe4 Nxe4 9.Qxe4 e5 10.dxe5

D45 Shabalov Attack, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Qc2 Bd6 7.g4

D46 D46 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3

D46 Romi Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 Bb4

D46 Chigorin Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 Bd6

D46 Bogoljubow Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 Be7

D47 Meran Variation, QGD; D47 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4

D47 Lundin; Neo-Meran 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 b4

D47 Wade Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7

D47 Larsen Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 Bb7 9.e4 b4 10.Na4 c5

D48 Reynolds Variation, QGD; D48 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6

D48 Pirc Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 b4

D48 Old Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5

D48 Reynolds Variation, Semi-Slav 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 d5

D48 Old Meran Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.O-O

D49 Blumenfeld Variation, QGD; D49 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5

D49 Sozin Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Nxe5

D49 Stahlberg Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Nf3 c6 5.e3 Nbd7 6.Bd3 dxc4 7.Bxc4 b5 8.Bd3 a6 9.e4 c5 10.e5 cxd4 11.Nxb5 Nxe5 12.Nxe5 axb5

D50 Modern Variation, QGD; D50 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5

D50 Uhlmann Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.Nf3 h6 6.Bh4 O-O 7.Rc1 dxc4

D50 Been & Koomen; Dutch & Peruvian 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5

D50 Pseudo-Tarrasch Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5

D50 Canal; Venice Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.cxd5 Qb6

D50 Primitive Pillsbury Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 c5 5.Nf3 cxd4 6.Qxd4

D51 Knight Defense, QGD; D51 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7

D51 Manhattan; Westphalia Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Bb4

D51 Westphalian Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 Bb4 6.Nf3 c5

D51 Alekhine Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.Nf3 c6 6.e4

D51 Alekhine Gambit, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.Nf3 h6 6.Bh4 dxc4

D52 D52 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3

D52 Cambridge Springs; Pillsbury Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5

D52 Bogoljubov Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5 7.Nd2 Bb4 8.Qc2

D52 Argentine Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5 7.Nd2 Bb4 8.Qc2 O-O 9.Bh4

D53 D53 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7

D53 Heral Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.Bxf6

D53 Lasker Defense, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 Ne4

D54 Neo-Orthodox Variation, QGD; D54 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Rc1

D55 D55 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3

D55 Pillsbury Attack, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 b6 7.Bd3 Bb7 8.cxd5 exd5 9.Ne5

D55 Neo Orthodox Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6

D55 Anti-Tartakower Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bxf6

D55 Petrosian Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bxf6 Bxf6 8.Rc1 c6 9.Bd3 Nd7 10.O-O dxc4

D56 D56 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4

D56 Lasker Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7

D56 Teichmann Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7 9.Qc2

D57 D57 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7 9.cxd5

D57 Bernstein Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 Ne4 8.Bxe7 Qxe7 9.cxd5 Nxc3 10.bxc3

D58 Tartakower Variation, QGD; D58 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6

D59 Exchange Variation, Tartakower Defense, QGD; D59 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 h6 7.Bh4 b6 8.cxd5 Nxd5

D60 Orthodox Variation, QGD; D60 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7

D60 Botvinnik Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Bd3

D60 Rauzer Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qb3

D61 Rubinstein Variation, Orthodox Defense, QGD; D61 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qc2

D62 D62 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Qc2 c5 8.cxd5

D63 D63 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1

D63 Henneberger; Swiss Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 a6

D63 Capablanca Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 b6 8.cxd5 exd5 9.Bb5

D63 Pillsbury Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 b6 8.cxd5 exd5 9.Bd3

D63 Rubinstein Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6

D64 Janowski Variation, Orthodox Defense, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.h4

D64 Rubinstein Attack, Orthodox Defense, QGD; D64 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2

D65 D65 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Qc2 a6 9.cxd5

D66 D66 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3

D66 Fianchetto Variation, Orthodox Defense, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 b5

D67 Capablanca Freeing Maneuver, QGD; D67 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5

D67 Alekhine Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.Ne4

D67 Classical Variation, QGD 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.O-O Nxc3 12.Rxc3

D68 D68 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.O-O Nxc3 12.Rxc3 e5

D69 D69 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Be7 5.e3 O-O 6.Nf3 Nbd7 7.Rc1 c6 8.Bd3 dxc4 9.Bxc4 Nd5 10.Bxe7 Qxe7 11.O-O Nxc3 12.Rxc3 e5 13.dxe5

D70 King's Indian Defense; West Indian Defense; D70 1.d4 Nf6 2.c4 g6

D70 Anti-Gruenfeld Variation 1.d4 Nf6 2.c4 g6 3.d5

D70 Danube Gambit; Adorjan Gambit 1.d4 Nf6 2.c4 g6 3.d5 b5

D70 Danube; Donau Gambit 1.d4 Nf6 2.c4 g6 3.d5 b5 4.cxb5 a6 5.bxa6 c6

D70 Nimzovich Attack; Anti-Gruenfeld; Alekhine Variation 1.d4 Nf6 2.c4 g6 3.f3

D70 Goglidze Attack 1.d4 Nf6 2.c4 g6 3.f3 d5

D70 Leko Gambit 1.d4 Nf6 2.c4 g6 3.f3 e5

D70 Kemeri; Neo-Gruenfeld 1.d4 Nf6 2.c4 g6 3.g3 d5

D70 Lutikov Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.f3

D70 Murey Attack, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.f3 c5 5.cxd5 Nxd5 6.Na4

D70 Neo-Gruenfeld Defense 1.d4 Nf6 2.c4 g6 3.Nf3 d5

D70 Iago Defense 1.d4 Nf6 2.c4 Nc6

D71 Counterthrust Variation 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7

D71 Exchange Variation, Neo-Gruenfeld 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.cxd5 Nxd5

D71 D71 1.d4 Nf6 2.c4 Nc6 3.g3 d5

D72 D72 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.cxd5 Nxd5 6.e4 Nb6

D73 D73 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3

D74 Delayed Exchange Variation, Neo-Gruenfeld; D74 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.cxd5 Nxd5 7.O-O

D75 D75 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.cxd5 Nxd5 7.O-O c5

D76 D76 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.cxd5 Nxd5 7.O-O Nb6

D77 Classical Variation, Neo-Gruenfeld; D77 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O

D78 Original Defesne, Neo-Gruenfeld; D78 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6

D78 Modern Defense, Neo-Gruenfeld 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O dxc4

D78 Polgar Variation, Neo-Gruenfeld 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O Nc6

D79 D79 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5

D79 Ultra-delayed Exchange Variation, Neo-Gruenfeld 1.d4 Nf6 2.c4 g6 3.g3 d5 4.Bg2 Bg7 5.Nf3 O-O 6.O-O c6 7.cxd5 cxd5

D80 Gruenfeld Defense; D80 1.d4 Nf6 2.c4 g6 3.Nc3 d5

D80 Stockholm Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5

D80 Lundin Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bg5 Ne4 5.Nxe4 dxc3 6.Qd2 c5

D80 Makogonov Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.b4

D80 Opocensky Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd2

D80 Paris Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd3

D80 Schlechter Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd3 c6

D80 Flohr Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd3 c6 7.O-O Bf5

D80 Smyslov Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Bd3 c6 7.O-O Bg4

D80 Vienna Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Qb3

D80 Pachman Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Qb3 dxc4 7.Bxc4 Nbd7 8.Ng5

D80 Botvinnik Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 Bg7 5.Nf3 O-O 6.Qb3 e6

D80 Schlechter Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.e3 c6

D80 Kemeri Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.g3

D80 Gibbon Gambit; Gruenfeld Spike 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.g4

D80 Zaitsev Gambit, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.h4

D81 Accelerated Russian Variation, Gruenfeld; D81 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Qb3

D82 Brinckmann Attack, Gruenfeld; D82 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4

D83 Gruenfeld Gambit; D83 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O

D83 Capablanca Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.Rc1

D83 Botvinnik Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.Rc1 c5 7.dxc5 Be6

D83 Reshevsky Gambit, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.Rc1 c5 7.dxc5 Qa5

D84 D84 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Bf4 Bg7 5.e3 O-O 6.cxd5 Nxd5

D85 Exchange Variation, Gruenfeld; D85 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5

D85 Exchange Variation, Gruenfeld; 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3

D85 Modern Main Line, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3

D85 Kramnik's Line, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Nf3 c5 8.h3

D85 Kemeri Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.g3

D85 Nadanian Attack 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.Na4

D86 Classical Main Line, Gruenfeld; D86 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4

D86 Simagin Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 b6 9.h4 Ba6

D86 Simagin Improved Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 Nc6

D86 Larsen Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 Qd7

D86 Larsen Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 Qd7 9.O-O b6

D87 Spassky Variation, Gruenfeld; D87 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 c5

D87 Seville Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 c5 9.O-O Nc6 10.Be3

D88 D88 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 c5 9.O-O Nc6 10.Be3 cxd4

D89 D89 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 c5 9.O-O Nc6 10.Be3 cxd4 11.cxd4 Bg4 12.f3 Na5 13.Bd3

D89 Sokolsky Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.cxd5 Nxd5 5.e4 Nxc3 6.bxc3 Bg7 7.Bc4 O-O 8.Ne2 c5 9.O-O Nc6 10.Be3 cxd4 11.cxd4 Bg4 12.f3 Na5 13.Bd3 Be6 14.d5

D90 Three Knights Variation, Gruenfeld; D90 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3

D90 Flohr Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qa4+

D90 Slav Fianchetto 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Nf6 5.Nc3 g6

D91 Petrosian System, Gruenfeld; D91 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bg5

D92 Hungarian Attack, Gruenfeld; D92 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bf4

D93 D93 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Bf4 O-O 6.e3

D94 Burille Variation, Gruenfeld; D94 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3

D94 Makogonov Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.b4

D94 Opocensky Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.Bd2

D95 D95 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.e3 O-O 6.Qb3

D96 Russian Variation, Gruenfeld; D96 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3

D97 D97 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4

D97 Hungarian Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 a6

D97 Levenfish Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 b6

D97 Szabo (Boleslavsky) Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 c6

D97 Prins Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Na6

D97 Simagin (Byrne) Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Nc6

D98 Smyslov Variation, Gruenfeld; D98 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4

D98 Keres Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4 8.Be2 Nfd7 9.Be2 Nb6 10.Qd3 Nc6 11.O-O-O Qc8

D99 D99 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4 8.Be3 Nfd7 9.Qb3

D99 Yugoslav Variation, Gruenfeld 1.d4 Nf6 2.c4 g6 3.Nc3 d5 4.Nf3 Bg7 5.Qb3 dxc4 6.Qxc4 O-O 7.e4 Bg4 8.Be3 Nfd7 9.Qb3 c5

E00 East Indian Defense; E00 1.d4 Nf6 2.c4 e6

E00 Seirawan Attack 1.d4 Nf6 2.c4 e6 3.Bg5

E00 Catalan Opening 1.d4 Nf6 2.c4 e6 3.g3

E00 Hungarian Gambit, Catalan 1.d4 Nf6 2.c4 e6 3.g3 e5

E00 Devin Gambit, Catalan 1.d4 Nf6 2.c4 e6 3.g4

E01 E01 1.d4 Nf6 2.c4 e6 3.g3 d5

E02 E02 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4

E03 E03 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4

E03 Alekhine Variation, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Qa4+ Nbd7 6.Qxc4 a6 7.Qc2

E04 Open Defense, Catalan; E04 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3

E05 Classical Line, Catalan; E05 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Be7

E05 Modern Sharp Variation, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 dxc4 5.Nf3 Nc6 6.Qa4 Bb4+

E06 Closed Variation, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2

E06 E06 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7

E06 Tarrasch Defense, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 c5 5.Nf3 Nc6

E07 E07 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7

E07 Botvinnik Variation, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7 7.Nc3 c6 8.Qd3

E08 E08 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7 7.Qc2

E08 Zagoriansky Variation, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7 7.Qc2 c6 8.Rd1 b6 9.a4

E09 E09 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7 7.Qc2 c6 8.Nbd2

E09 Sokolsky Variation, Catalan 1.d4 Nf6 2.c4 e6 3.g3 d5 4.Bg2 Be7 5.Nf3 O-O 6.O-O Nbd7 7.Qc2 c6 8.Nbd2 b6 8.Nbd2 b6 9.b3 a5 10.Bb2 Ba6

E10 Anti-Nimzo-Indian; E10 1.d4 Nf6 2.c4 e6 3.Nf3

E10 Dzindzi-Indian Defense 1.d4 Nf6 2.c4 e6 3.Nf3 a6

E10 Blumenfeld Variation 1.d4 Nf6 2.c4 e6 3.Nf3 c5

E10 Blumenfeld Countergambit 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5

E10 Dus-Chotimursky Variation 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5

E10 Spielmann Variation, Blumenfeld 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.Bg5 exd5 6.cxd5 h6

E10 Blumenfeld Countergambit Accepted 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.dxe6 fxe6 6.cxb5 d5

E10 Rubinstein Variation, Blumenfeld 1.d4 Nf6 2.c4 e6 3.Nf3 c5 4.d5 b5 5.e4

E10 Dory (Doery) Defense 1.d4 Nf6 2.c4 e6 3.Nf3 Ne4

E11 Bogoljubow Defense; Bogo-Indian Defense; E11 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+

E11 Monticelli Trap 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Bxd2+ 5.Qxd2 b6 6.g3 Bb7 7.Bg2 O-O 8.Nc3 Ne4 9.Qc2 Nxc3 10.Bg5

E11 Nimzovich Variation, Bogo-Indian 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Bd2 Qe7

E11 Gruenfeld Variation, Bogo-Indian 1.d4 Nf6 2.c4 e6 3.Nf3 Bb4+ 4.Nbd2

E12 Queen's Indian Defense; E12 1.d4 Nf6 2.c4 e6 3.Nf3 b6

E12 Petrosian Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3

E12 Farago Defense, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Ba6 5.Qc2 Bb7

E12 Murey Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.a3 Bb7 5.Nc3 d5 6.cxd5 Nxd5 7.Qc2 c5 8.e4 Nxc3 9.bxc3 Nc6 10.Bb2 cxd4 11.cxd4 Rc8 12.Rd1 Bd6

E12 Miles Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Bf4

E12 Kasparov Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3

E12 Kasparov-Petrosian Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.a3

E12 Polovodin Gambit, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.a3 d5 6.cxd5 Nxd5 7.e4

E12 Hedgehog Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.a3 g6

E12 Botvinnik Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.Bg5 h6 6.Bh4 g5 7.Bg3 Nh5

E13 E13 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.Nc3 Bb7 5.Bg5 h6 6.Bh4 Bb4

E14 Spassky System, QID; E14 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3

E14 Averbakh Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.e3 Bb7 5.Bd3 c5 6.O-O Be7 7.b3 O-O 8.Bb2 cxd4 9.Nxd4

E15 Fianchetto System, QID; E15 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3

E15 Nimzovich Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6

E15 Quiet Line, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.b3

E15 Nimzovich Attack, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qa4+

E15 Timman's Line, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Ba6 5.Qb3

E15 Saemisch Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5

E16 Fianchetto Traditional, QID; E16 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7

E16 Capablanca Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+

E16 Yates Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 a5

E16 Riumin Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Bb4+ 6.Bd2 Be7

E16 Buerger Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5 6.d5 exd5 7.Ng5

E16 Rubinstein Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 c5 6.d5 exd5 7.Nh4

E16 Fine Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Qc8 6.O-O c5 7.d5

E17 Traditional Variation, QID; E17 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7

E17 Anti-Queen's Indian System 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.Nc3

E17 Opocensky Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.Nc3 Ne4 7.Bd2

E17 Classical Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O

E17 Euwe Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.b3

E17 Taimanov Gambit, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.d5 exd5 8.Nd4

E17 Polugaevsky Gambit, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.d5 exd5 8.Nh4

E17 Kramnik Variation, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Re1

E18 E18 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3

E18 Tiviakov Defense, QID 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Na6

E19 E19 1.d4 Nf6 2.c4 e6 3.Nf3 b6 4.g3 Bb7 5.Bg2 Be7 6.O-O O-O 7.Nc3 Ne4 8.Qc2

E20 E20 1.d4 Nf6 2.c4 e6 3.Nc3

E20 Nimzo-Indian Defense 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4

E20 Kmoch Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.f3

E20 Steiner Variation, Nimzo-Indian; Romanishin Variation 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.g3

E20 Romanishin Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.g3 O-O 6.Bg2

E20 English Hybrid, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.g3 O-O 6.Bg2 cxd4 7.Nxd4 d5 8.cxd5 Nxd5

E20 Ragozin Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 d5

E21 Three Knights Variation, Nimzo-Indian; E21 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3

E21 Korchnoi Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5

E21 Shocron Gambit, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5 b5

E21 Euwe Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Nf3 c5 5.d5 Ne4

E22 Spielmann Variation, Nimzo-Indian; E22 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3

E23 Romanovsky Gambit, Nimzo-Indian; E23 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6

E23 San Remo Variation, Nimzo-Indian; Stahlberg Variation 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5

E23 Stahlberg Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxc5 8.Qc2 f5 9.g3

E23 Carlsbad Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2

E23 Stahlberg Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qb3 c5 5.dxc5 Nc6 6.Nf3 Ne4 7.Bd2 Nxd2 8.Nxd2 O-O 9.O-O-O

E24 Saemisch Variation, Nimzo-Indian; E24 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3

E24 Accelerated Saemisch Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3

E24 Botvinnik Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.f3 d5 7.e3 O-O 8.cxd5 Nxd5

E25 E25 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.f3 d5 7.cxd5

E25 Keres Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.f3 d5 7.cxd5 Nxd5 8.dxc5

E25 Romanovsky Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.f3 d5 7.cxd5 Nxd5 8.dxc5 f5

E26 Saemisch Variation, Nimzo-Indian; E26 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.e3

E26 O'Kelly Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.e3 b6

E26 Capablanca Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 c5 6.e3 Nc6 7.Bd3 O-O 8.Ne2 b6 9.e4 Ne8

E27 E27 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O

E28 E28 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O 6.e3

E29 E29 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O 6.e3 c5 7.Bd3 Nc6

E29 Capablanca Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.a3 Bxc3+ 5.bxc3 O-O 6.e3 c5 7.Bd3 Nc6 8.Ne2 b6 9.e4 Ne8

E30 Leningrad Variation, Nimzo-Indian; E30 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5

E30 Averbakh Gambit, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 b5

E31 Benoni Defense, Nimzo-Indian; E31 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Bg5 h6 5.Bh4 c5 6.d5 d6

E32 Classical Variation, Nimzo-Indian; E32 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2

E33 Milner-Barry, Zurich Variation, Nimzo-Indian; E33 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 Nc6

E33 Milner-Barry Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 Nc6 5.Nf3 d6

E33 Old Zurich Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 Nc6 5.Nf3 d6 6.a3

E33 Vitolinsh-Adorjan Gambit, Nimzo Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 O-O 5.a3 Bxc3+ 6.Qxc3 b5

E33 Keres Defense, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 O-O 5.a3 Bxc3+ 6.Qxc3 b6

E34 Noa Variation, Nimzo-Indian; E34 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5

E35 E35 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 exd5

E35 Romanishin Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 exd5 6.Nf3 Qf5

E35 Beliavsky Gambit, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.cxd5 exd5 6.Nf3 Qf5 7.Qd1 e5

E36 E36 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3

E36 Botvinnik Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Nc6

E37 E37 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Ne4

E37 San Remo Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 d5 5.a3 Bxc3+ 6.Qxc3 Ne4 7.Qc2 Nc6 8.e3 e5

E38 Berlin Variation, Nimzo-Indian; E38 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5

E38 Steiner Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 Bxc3+

E39 Pirc Variation, Nimzo-Indian; E39 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.dxc5 O-O

E40 Rubinstein Variation, Nimzo-Indian; E40 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3

E40 Keres Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 d5 5.a3 Bxc3+ 6.bxc3 c5 7.cxd5 exd5 8.Bd3 O-O 9.Ne2 b6

E40 Taimanov Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 Nc6

E40 Ragozin Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 Nc6 5.Nf3 O-O 6.Bd3 d5 7.O-O dxc4

E41 Huebner Variation, Nimzo-Indian; E41 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5

E41 Huebner Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Bd3 Nc6 6.Nf3 Bxc3

E41 Panov Attack, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Nf3 cxd4 6.exd4 d5

E42 Rubinstein Variation, Nimzo-Indian; E42 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2

E42 Sherbakov Attack, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 c5 5.Ne2 cxd4 6.exd4 O-O 7.c5

E43 St. Petersburg Variation, Nimzo-Indian; E43 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6

E44 Fischer Variation, Nimzo-Indian; E44 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2

E45 Bronstein Variation, Nimzo-Indian; E45; Byrne Variation 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 b6 5.Ne2 Ba6

E46 Normal Variation, Nimzo-Indian; E46 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O

E46 Reshevsky Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Ne2

E46 Simagin Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Ne2 d5 6.a3 Bd6

E46 Reshevsky Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nge2

E46 Simagin Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nge2 d5 6.a3 Bd6

E47 Bishop Attack, Nimzo-Indian; E47 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3

E48 Classical Defense, Nimzo-Indian; E48 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5

E48 Olafsson Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 c5 7.O-O dxc4 8.Bxc4 b6 9.Qe2 Bb7 10.Rd1 Qc8

E48 Bronstein Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 c5 7.O-O dxc4 8.Bxc4 Bd7

E48 Bronstein Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 c5 7.O-O dxc4 8.Bxc4 Nbd7 9.Ne2

E48 Smyslov Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.Nf3 c5 7.O-O dxc4 8.Bxc4 Qe7

E49 Botvinnik System, Nimzo-Indian; E49 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Bd3 d5 6.a3 Bxc3+ 7.bxc3

E50 E50 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3

E50 Huebner Deferred, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 c5

E51 Ragozin Variation, Nimzo-Indian; E51 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5

E51 Saemisch Deferred, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.a3

E52 Schlechter Defense, Nimzo-Indian; E52 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 b6

E53 Bernstein Defense; Gligoric System; E53 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5

E53 Keres Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O b6

E54 E54 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O dxc4 8.Bxc4

E55 Bronstein Variation, Nimzo-Indian; E55 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O dxc4 8.Bxc4 Nbd7

E55 Smyslov Variation, Nimzo-Indian 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O dxc4 8.Bxc4 Qe7

E56 Bernstein Variation, Nimzo-Indian; E56 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6

E57 E57 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 8.a3 dxc4 9.Bxc4 cxd4

E58 E58 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 8.a3 Bxc3 9.bxc3

E59 E59 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.e3 O-O 5.Nf3 d5 6.Bd3 c5 7.O-O Nc6 8.a3 Bxc3 9.bxc3 dxc4 10.Bxc4

E60 King's Indian Defense; West Indian Defense; E60 1.d4 Nf6 2.c4 g6

E60 Fianchetto Variation, KID 1.d4 Nf6 2.c4 g6 3.g3

E60 Counterthrust Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d5

E60 Kemeri Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d5 5.cxd5 Nxd5 6.Nf3 O-O 7.O-O c5

E60 Yugoslav Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.Nc3 c5

E60 Bronstein Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.Nc3 c6 7.O-O Qa5

E60 Panno Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.Nc3 Nc6 7.O-O a6 8.h3 Rb8

E60 Spassky Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.Nc3 Nc6 7.O-O Bf5

E60 Simagin Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.Nc3 Nc6 7.O-O Bg4

E60 Szabo Variation 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.Nc3 Nc6 7.O-O e5

E60 Panno System 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 d6 5.Nf3 O-O 6.O-O Nc6 7.d5 Na5

E60 Pomar Variation, KID 1.d4 Nf6 2.c4 g6 3.g3 Bg7 4.Bg2 O-O 5.Nge2

E60 King's Knight Variation, KID 1.d4 Nf6 2.c4 g6 3.Nf3

E60 Santassiere Variation, KID 1.d4 Nf6 2.c4 g6 3.Nf3 Bg7 4.b4

E61 E61 1.d4 Nf6 2.c4 g6 3.Nc3

E61 Smyslov Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Bg5

E61 Smyslov Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.Bg5

E62 Delayed Fianchetto, KID; E62 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3

E62 Larsen Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c6 7.O-O Bf5

E62 Kavalek Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c6 7.O-O Qa5

E62 Benjamin Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c6 7.O-O Qb6

E62 Carlsbad Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6

E62 Lesser Simagin (Spassky) Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6 7.O-O Bf5

E62 Simagin Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6 7.O-O Bg4

E62 Uhlmann-Szabo System, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6 7.O-O e5

E63 Panno Variation, KID; E63 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nc6 7.O-O a6

E64 Yugoslav Variation, KID; E64 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c5

E65 E65 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c5 7.O-O

E66 E66 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 c5 7.O-O Nc6 8.d5

E67 Debrecen Defense, KID; E67 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nbd7

E68 E68 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nbd7 7.O-O e5 8.e4

E69 E69 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.g3 O-O 6.Bg2 Nbd7 7.O-O e5 8.e4 c6 9.h3

E70 Normal Variation, KID; E70 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4

E70 Accelerated Averbakh Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Bg5

E70 Kramer Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.Nf3 d6 5.Nge2

E71 Makogonov Variation, KID; E71 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.h3

E72 Deferred Fianchetto, KID; E72 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.g3

E72 Pomar System, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.g3 O-O 6.Bg2 e5 7.Nge2

E73 E73 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2

E73 Semi-Averbakh System, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Be3

E73 Averbakh Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5

E73 Spanish Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 a6

E73 Flexible Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 h6

E73 Burgess Line, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 Na6 7.Qd2 c6

E73 Geller Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 Nbd7

E74 Benoni Defense, KID; E74 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 c5

E75 E75 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Be2 O-O 6.Bg5 c5 7.d5 c6

E76 Four Pawns Attack, KID; E76 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4

E76 Six Pawns Attack, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 c5 6.d5 O-O 7.Be2 e6 8.dxe6 fxe6 9.g4 Nc6 10.h4

E76 Modern Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 Na6

E76 Dynamic Attack, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 O-O 6.Nf3 c5 7.d5

E77 Six Pawns Attack, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6

E77 E77 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 O-O 6.Be2

E77 Florentine Gambit, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 O-O 6.Be2 c5 7.d5 e6 8.Nf3 exd5 9.e5

E78 Fluid Attack, KID; E78 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 O-O 6.Be2 c5 7.Nf3

E79 Exchange Variation, Four Pawns Attack, KID; E79 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f4 O-O 6.Be2 c5 7.Nf3 cxd4 8.Nxd4 Nc6 9.Be3

E80 Saemisch Variation, KID; E80 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3

E80 Bronstein Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 e5 6.d5 Nh5 7.Be3 Na6 8.Qd2 Qh4+ 9.g3 Nxg3 10.Qf2 Nxf1 11.Qxh4 Nxe3 12.Kf2 Nxc4

E81 Normal Defesne, Sameisch Variation, KID; E81 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O

E81 Byrne Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 c6 7.Bd3 a6

E81 Steiner Attack, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Bg5

E81 Bobotsov-Korchnoi-Petrosian Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Nge2

E82 Double Fianchetto, KID; E82 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 b6

E83 Yates Defense, KID; E83 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 Nc6

E83 Panno Formation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 Nc6 7.Nge2 a6

E83 Ruban Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 Nc6 7.Nge2 Rb8

E84 E84 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 Nc6 7.Nge2 a6 8.Qd2 Rb8

E85 Orthodox Variation, KID; E85 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5

E86 E86 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.Nge2 c6

E87 Closed Variation, KID; E87 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.d5

E87 Bronstein Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.d5 Nh5 8.Qd2 Qh4+ 9.g3 Nxg3 10.Qf2 Nxf1

E88 E88 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.d5 c6

E89 E89 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.f3 O-O 6.Be3 e5 7.d5 c6 8.Nge2

E90 E90 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3

E90 Larsen Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be3

E90 Zinnowitz Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Bg5

E91 Orthodox Variation, KID; E91 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2

E91 Kazakh Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Na6

E92 E92 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5

E92 Gligoric-Taimanov Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.Be3

E92 Petrosian Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5

E92 Stein Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 a5

E93 E93 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 Nbd7

E93 Keres Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.d5 Nbd7 8.Bg5 h6 9.Bh4 g5 10.Bg3 Nh5 11.h4

E94 E94 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O

E94 Ukranian Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O a5

E94 Donner Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O c6

E94 Glek Defense, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Na6

E95 E95 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nbd7 8.Re1

E96 E96 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nbd7 8.Re1 c6 9.Bf1 a5

E97 Aronin-Taimanov Variation, KID; E97 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6

E97 Normal Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7

E97 Bayonet Attack, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.b4

E97 Yepishin's Line, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.b4 Nh5 10.Qc2

E97 Sokolov's Line, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.b4 Nh5 10.Re1

E97 Korchnoi Attack, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Bd2

E98 E98 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1

E98 Kozul Gambit, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.Be3 f5

E99 Benko Attack, KID; E99 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.f3

E99 Benko Variation, KID 1.d4 Nf6 2.c4 g6 3.Nc3 Bg7 4.e4 d6 5.Nf3 O-O 6.Be2 e5 7.O-O Nc6 8.d5 Ne7 9.Ne1 Nd7 10.f3 f5 11.g4

© ChessLecture.com
Privacy Policy - Terms of Use - Contact Us