Small Differences Can Make Big Differences by FM Dennis Monokroussos
Petroff’s Defense can lead to quiet positions, but not always. In this game from the 2017 Isle of Man, an isolated d-pawn middlegame arose, but one in which Black had a c-pawn rather than an e-pawn. Anna Zatonskih prepared a relatively rare line with Black, and in the main variation of that line Black deals with pressure against h7 by playing …h6, not …g6. Nils Grandelius pressured h7 in a slightly different way, and Zatonskih should have adapted and played ...g6 rather than ...h6. When she didn’t…well, see for yourself.