Here the knight is not attacking anything, but all white pieces are now set for the attack.

21...Re8 22.e5 Nf8 23.Nf6+

The only move

White is winning. His rook can invade Black's position and he may create a passed pawn on the queenside.

Of course, you will think now, the position calls for this characteristic sacrifice, which so often occurs in open Sicilians.
Yet, remarkably, it was only in 2008 that this move came to the fore.

The wrong way to conquer the pawn on c6. 13...Qc7 is better. After 1 4.g5 Black can return the piece with 14...0-0.

15.c7! The refutation.