1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Qb3 After getting nothing out of the opening with his usual Exchange Variation, Topalov decides to switch to the Russian Variation - a line he has never played before, as far as we know.
4... dxc4 5. Qxc4 Bg7 6. e4 O-O 7. Be2 This move-order is becoming popular rapidly.
7... a6 7... Nfd7 8. Be3 Nb6 9. Qd3 (9. Qc5 e5 10. Nf3 N8d7 11. Qa5 exd4 12. Bxd4 Bxd4 13. Nxd4 Qe7 14. O-O Nc5 15. Qa3 Re8 16. Rfe1 Ne6 17. Qxe7 Rxe7 18. Nc2 Nc5 19. f3 1/2-1/2 Ivanchuk-Svidler, Foros 2007)
9... f5 10. Rd1 f4 11. Bc1 e5 12. d5 c6 13. Nf3 cxd5 14. Nxd5 Nxd5 15. Qb3 (15. Qxd5+ Qxd5 16. exd5 Bf5 17. O-O Nd7 18. Rfe1 a6 19. Bd2 Rac8 20. Ng5 Rc2 21. Ne6 Rfc8 22. Nxg7 Kxg7 23. Bc3 Kf6 24. Bf3 b5 Jakovenko-Mamedyarov, Elista GP 2008)
15... Kh8 16. Bc4 Nc6 17. Bxd5 Qe7 was Carlsen-Dominguez Perez, Corus (Wijk aan Zee) 2009
8. Bf4 8. Be3 b5 9. Qb3 Bb7 10. f3 Nfd7 11. Nh3 Nc6 12. Rd1 Nb6 13. d5 Na5 14. Qc2 Nac4 15. Bxc4 Nxc4 16. Bc5 Re8 17. O-O Qc8 18. b3 Nd6 19. Nf4 was another recent top-level game: Alekseev-Pelletier, Biel 2008
8... b5 9. Qxc7 Qxc7
9... b4? 10. Qxd8 Rxd8 11. Na4
Yakovich-Kovchan, Noyabrsk 2003
9... Qxd4 10. Rd1 (10. Nf3 Qd7=)
10... Qb4 11. Rd2 Nbd7 (but not 11... Nxe4? 12. a3)
12. Be3! (12. Nf3 Qc5)
12... Rb8 13. a3 Qb3 14. Nf3 "and White maintains some initiative" was all given by Krasenkow.
10. Bxc7 b4 10... Bb7 looks like a reasonable move too, e.g. 11. f3 Nc6 12. d5 Nd4 13. Bd3 Nd7
11. Na4 Nc6 12. d5 A principled continunation - from now on both sides keep on creating threats.
12. e5 Nd5 13. Bf3 is quite interesting too, e.g. 13... Be6 14. Nb6 Nxc7 15. Nxa8 Nxd4 16. Nxc7 Nc2+ 17. Kd2 Nxa1 18. Nxe6 fxe6 19. Nh3 Rd8+ 20. Kc1 b3 which is probably OK for Black.
12... Nd4 13. Bd3 Bd7 14. Nb6 Bb5 15. Be5 15. Rd1 Ra7 16. d6 Re8! 17. f3 Rb7! 18. Ne2 exd6 19. Nxd4 Rxc7 looks slightly better for Black.
15... Nxe4 this leads to a drawish position (and there's nothing wrong with that, of course).
15... Bxd3 16. Bxd4 Rab8 17. f3 Bb5! keeping the knight locked in, looks very interesting too. It's White who has to be careful.
16. Bxg7 Kxg7 17. Bxe4 Rab8 18. O-O-O Nf5 19. Bxf5 gxf5 20. d6 Rxb6 21. dxe7 Re8 22. Nf3 Rxe7 Black's structure is slightly worse but on the other hand he has very active pieces.
23. Nd4 Bd7 24. Rhe1 Rxe1 25. Rxe1 Rh6 Provoking h2-h3.
26. Re7 Rd6 27. Ne2 Kf6 28. Re3 Ba4 A nice intermediate move, fixing the pawns on white squares.
29. b3 Bc6 30. Nf4 With his knight on the ideal square, White has a tiny edge but for someone like Kamsky it's nothing to worry about.
30... a5 31. g3 Be4 32. f3 Bc6 33. h4 Rd4 34. Kc2 Bb5 This prevents 35.Rd3 and now there's really no way to make progress anymore.
35. Nh5+ Kg6 36. Nf4+ Kf6 37. Nh5+ 1/2-1/2