12.Rxf4 would be better.

12...Be6

Now all white pieces, including a central queen, are aiming at Black's kingside. Very soon this proved to be too much for Black.

Not an innocent bystander, but one exerting annoying pressure against g7, together with the b2-bishop!

19...Rf7

21...exf4 22.f5 Ne5 23.f6

White's strong pressure against Black's kingside gives him . a clear advantage. Postny elegantly converted this.

Improving the position of the bishop.

Otherwise the beastly bishop will dominate both white rooks on d3 .