Black targets the a4-pawn. Well, it seems that Kasparov has said that in general, a knight on f5 is worth a pawn. So,

Making way for the knight, en route to f5!

27...Qxa4 28.Nd4 Qb4 29.Rc3 a4 30.Nf5

The killer knight.

Now it is over. White took on c4 and won after a few more moves.

You guessed it!

The pawn structure certainly will not bother White in the endgame after 6...dxc5 7.Qxd8+ Kxd8 8.Be3 e6 9.Nc3 Nf6 10.0-0-0 Nfd7 11.f4.

Yet by avoiding the endgame Black soon lands his queen in trouble.

8...Nd7 should have been played.

White is virtually winning already.

Very nice! White won 10 moves later.