"It is a surprisingly awkward position for Anand, despite the limited material. The odd imprecision and he could be in trouble." - GM Nigel Short
"This allows Magnus with strong play with kingside passed pawns" - GM Susan Polgar
"Black's problem is that rook is rather passive. White wants to push his pawn to f5 and/or attack the f6-pawn." - GM Nigel Short
In this position above Anand (Black) sacrificed his bishop for two pawns (31...Bxg?) and the computer graph (below) jumped up in favor for Carlsen.
The game ended in a draw as Carlsen (White) could not hold on to the small advantage he had and it finally evapurated in the endgame.
After a well known opening line the queens were traded off early and the game reached an equal endgame which ended in a draw.
Carlsen (Black) defended with the Greenfield Defence and Anand (White) selected the Russian System (5.Qb3 - see position above) which is a good way to go for a win with White. However, the queens were traded off early and the game ended in a draw. See below
After the dubious exchange sacrifice 27...Rb4? his position went downhill and he lost. (See below)White moves