GM Berkes,F(2679) in the Bundesliga 2012-2013

Here is an interesting game from recent Budesliga 2012-13 action. Let us see how a GM plays for a win against another strong GM.

Romanov,E (2611) - Berkes,F (2679) [A13]
Bundesliga 2012–13 Muelheim GER (2), 21.10.2012
1.c4 e6 2.g3 d5 3.Bg2 dxc4 4.Qa4+ c6 5.Qxc4 b5 6.Qc2 Bb7 7.Nc3 a6 8.a4 Nd7 9.Nf3 Ngf6 10.0–0 Be7 11.d4 0–0

Critical Position 1
The opening phase was nothing special. White pushed ambitously on the kingside and seems to be making progress. But now what? The critcal moment has arrived. What plan should white adopt? Maybe there is a combination?

White to play

Critcal Position 2

Much later in the game, white is playing a sharp ending but black has confused matters with a passed a-pawn. How should white play?

-Take the a6-pawn?

-Take the a3-pawn?

-Or is there something else?

White to play