Bundesliga 2012-13 Rd6

Here is a game played recently in the Bundesliga by veteran GM Nikolic,P agains strong Hungarian GM Acs,Peter.

GM Nikolic,Predrag

Photo Chessdom

The game contains no big attacks or sharp tactical blows. It is however very revealing in showing what is necessary to win certain games. The initial phase consists of creating a game with long-term
-Structural
-Minor piece imbalances.

Later white gained a piece for two pawns adding a material imbalance to the mix.

But still white did not establish a game turning position. In the process of both sides agreeing to maintain a dynamic equilibrium, one side(black) could not keep up and made an inaccuracy and then followed with another. Only now did white obtain a clear advantage to dictate the play. At this point there was no turning back and white converted the advantage to a full point

Nikolic,Pr (2638) - Acs,Peter (2586)
Slav ...a5 5.Bd2 [D10]
Bundesliga 2012–13 Wattenscheid GER (6), 09.12.2012

Position 1
The armies are not in direct contact so white is now free to choose a plan/regrouping. Suggest a plan and a move for white.

White to Play

31...Nc4

Position 2

White has just played 44.Be3.

Assess the position.

(a)The position is equal

(b)White is slightly better and pressing for the win

(c)Black is worse

(d)None of the above

What should black play now?

Black to Play

44.Be3