With focus on the enemy kingside. Now any capture on f3 will clear the g-file for the attack.

This just accelerates White's plan.
1...cxb4 2.axb4 Nd7! is a better try, speeding up his development.

Returning the pawn

This nice blow seals Black's fate.

Obviously both the queen and bishop were immune.

Black resigned.

Preparing ...Ng7-e6-d4 in order to seize the centre.

Intending Kh2 and Bh3 to swap the opponent's "good" bishop.

Accepting the sacrifice in order to gain time.