In all the three positions from yesterday we can recognize one element in common: the presence of the Isolated Queen’s Pawn. It is well known that the side with the IQP should strive for pushing the rupture d4-d5 in this case. After this move is played, the pawns in the center (d4 / e6) dissapear from the board and the activity of the pieces becomes the primary element. Knowing the concept, it’s time to have a look at the moves, it takes precise calculation:
Solution: 17.d5! exd5 18.Nxd5 Nxd5 19.Bxd5 Qb8 20.Bh6 +- With a decisive advantage. 20.Bxf7+! was even stronger, you can see for yourself.
Solution: 18.d5! exd5 19.Bxf6! (key move) Bxf6 20.Bxh7! (20.Nxd5 Bd8 21.b4 Qxa3 22.Ra1 Qb3 23.Bc4 traps the queen) Kxh7 21.Rxd5 White is clearly better, Karpov continued with 21…Bxc3 sacrificing his queen and but it wasn’t enough to save the game.
Solution: 13.d5! exd5 14.Nxd5! Nxd5 15.Bxh7+ Kh8 16.Be4 Be6 17.Bxd5 Bxd5 18.Qf5 white will be a clear pawn up on the next move. Topalov converted his advantage into a full point later on.