Preparing a pawn storm on the queenside with b2-b4 and a2-a4. 1.a3?! is less precise, since after1...f6 2.b4 Nf7 White will have to spend one more tempo protecting the b-pawn before he can push a3-a4.

4...b5! seems preferable, followed by ...Kb7 and ...Ra8.

Reinforcing the knight and preparing Qc3, d3-d4 and c4-c5 with a further attack.

Now the breakthrough c4-c5 is inevitable. The game continued

White won.

Initiating a central advance.

An excellent diagonal in the absence of a bishop on g7.

White has a pleasant position.

Gaining some space and enabling a future attack.