Preparing ...f4-f3 to damage the enemy pawn structure.

White is also under strong pressure after 2.Nxf4 Nxd4 with the double threat of 3...Rxf4 and 3...Nef5.

Black immediately exploits the protected square on f5.

A strong blow on the theme of deflection, which lets Black land a knight on f3.

Before taking the pawn it makes sense to mobilize the major pieces for an attack.

White resigned.

Preparing a4-a5 with a majority attack on Black's vulnerable queenside.

1...a5?! 2.Ndb5 Be7 3.Bh6 , preparing Rd2 and Rad1, Black is in big trouble.

2...bxa5 3.Nb3! , followed by Nxa5 – Petrosian.