22.Re1 Rg8 <22...Nf4? 23.Rf3>

25.Ne4 h4 <Svidler's idea and the reason why Topalov did not take the pawn may be explained by this variation: 25...Nf4 26.Rf3 Be4 27.Re4 Ng6 28.Bg3 Ra7 29.Rd3 Nf8 30.e7 Nd7. White has full compensation for the pawn (a dangerous passed pawn, cutting in two the Black forces)>

26.Rc4!? <Svidler could have played 26.Nc5! bc 27.Rc5 winning 3 pawns for the Knight and active play>

26...Ke7?! <26...Ra5 to impede the sac seems better. Now White wins a pawn>

31.Rc5!? <31.Rb1 holds the pawn and it is not clear that Black would have enough compensation for the pawn. The move actually played gives White a big initiative>

34...Ke8 <34...Kc8 35.Rc6 Rb6 36.Rb6 cb 37.Rd6 wins a pawn>

35.Rc6 <35.Bc7 Rc8>

35...Kf7 <35...Rb6 36.Rb6 cb 37.Rd6>

36.Rd7+ <36.Bc7 Rc8 37.Rdd6 Rc7 38.Rc7 Nc7 39.Rd7 Ke6 40.Rc7 Ke6 41.Rc7 Ra2. Black may reach a draw: the activity of his Rook and King gives some compensation>

39.Re4 <39.Bc7?! Nd4 40.Re8 Ke8 41.Rc4 Nc2 42.Ra4 Rb1 43.Kf2 Rb2! with a draw in view>

39...Ra2 (?!) <Maybe 39...Rb1!? 40.Kf2 f5! 41.Ra4 Ng5! 42.Rc7. White won 2 pawns but he has some problems with his King. For instance, 42...Kg6 (better than 42...Kg8 43.Raa7 Ne4 44.Ke3! Ng3 45.Kf4! (this is the difference: with the King on g6, this would not be good) Ne4 46.Rg7 in White's favour) 43.Rc6 Kh7. Now it seems that, at some point, White must sac the exchange when the Knight checks on e4, otherwise there is a draw. To give an idea: 44.Bc7 Ne4 45.Kf3 Nd2 46.Kg3 Ne4 47.Kh3 Rh8 48.Bg3 Ng5 49.Kh4 Ne4, repeting moves. If White plays instead 44.Rh4 Kg8 45.a4 Ne4 Re4, he has two pawns for the exchange, but it may not sufficient for a win.>

41.Re4 <41.Bc7? Rd2! 42.h3 Nd4 43.Rcc4?? Nf3!, Black mates.>