Black had a curious defence, involving the sacrifice of the h6-pawn: 19...f5! 20.Qxh6 (20.exf6? Bxf6 would be strong if 21.Qxh6? wasn’t refuted by 21...Qxe3+) 20...Kf7! (with the idea of winning the queen by 21...Rh8) 21.Qh7+ Ke6 (now the threat is to repeat moves, starting with 22...Rh8) 22.Bh4! Qf7 23.Qxf7 Rxf7 24.Bxe7 Rxe7 – now White has an extra pawn and a decent advantage, but the win is far from assured.

To exchange the best black piece.

Kashdan sacrifices the e5-pawn to quickly get his rooks into play. 22.exf4, with the idea of taking on g6 and playing f4- f5 again in order to permanently eliminate the black pawns on g6, was also strong.

Black resigned.

Black has managed to create a perfect structure against the doubled c-pawns. How do we keep putting pressure on the position?

Now the black knight and bishop put pressure against c4 and this forces the white bishop and queen to protect it.

Intending to eliminate one of the defenders of c4.

The only move that parries Be4 and Bxh7+.

Another piece comes to attack the c4 weakness!

In this balanced position, one of the best players of the world from the last century and even an analyst of the ex-world champion Robert James Fischer came up with a very interesting strategic idea: trade the fianchettoed bishop for the centralized knight on e5.