Sometimes the Karpov Variation Isn't Solid Enough by FM Dennis Monokroussos
The Karpov Variation of the Nimzo-Indian (which can arise through the Caro-Kann as well!) is an excellent repertoire choice for Black, combining both solidity and chances to play for a win. The general theory is also pretty stable, but here as everywhere in chess, new ideas show up from time to time, and Ponomariov used one in this game. Objectively, Black has sufficient resources, but one must figure things out over the board, and at least this time around Black failed to do so. Macieja made a surprising error (or two) and was punished, but even apart from the results of this game there is much we can learn from it.