1. c2c4  1... c7c5  2. g2g3  2... g7g6  3. f1g2  3... f8g7  4. b1c3  4... b8c6  5. g1f3  5... d7d6  6. e1g1  6... c8f5  7. b2b3  7... g8f6  8. c1b2  8... f6e4 A logical novelty. Black makes use of the pin  to trade the dark-squared bishops. 9. c3a4  9... g7b2  10. a4b2  10... d8d7  11. f3h4 Topalov on his turn uses the shaky  position of the black knight to secure the dominance of his bishop. 11... e4f6  12. h4f5  12... d7f5  13. e2e3  13... e8g8  14. b2a4 The knight is getting back  into play. More importantly, it hits the c5 pawn, thus preventing the  freeing d6-d5 advance. 14... a8d8  15. a2a3 Another useful, flexible move. White has three  possible, interesting advances: b3-b4, d2-d4 and f2-f4. He does not need  to force any of them. 15... f5c8 This does not seem very accurate. No-one was threatening the  queen where it was, and it could have been useful when mounting pressure  on the kingside. 16. a1c1 More strong prophylaxis. The rook is aimed against the black  queen, thus making the d6-d5 advance virtually impossible. 16... g8g7  This is needed. 17. d1c2  17... h7h5  18. h2h3  18... b7b6  19. a4c3  19... f8e8  20. f2f4 The time has come for Topalov to get his pawns into  motion. 20... e7e6  21. c2b2 X-raying the king while preparing the  b3-b4 advance. 21... g7g8  22. c3e2  22... f6h7  23. d2d4  23... c5d4  24. e2d4 The trade of another minor piece is  definitely favorable for Black. 24... c6d4  25. e3d4  25... h7f6 Vachier-Lagrave is patiently waiting for his  chance. 26. g1h2  26... g8g7  27. b3b4  27... c8c7  28. a3a4 Topalov expands all over the board.  Vachier-Lagrave needs to react. 28... e6e5  29. f4e5  29... d6e5  30. c4c5  30... h5h4 This is the idea that Topalov underestimated.  Vachier-Lagrave sacrifices a whole piece, but kills a bunch of pawn in the process and secures the half point. 31. c5b6  31... h4g3  32. h2h1 