A good move.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. d2d3  4... g8f6  5. c2c3  5... e8g8  6. c1g5  6... h7h6  7. g5h4  7... c5e7  8. b1d2  8... d7d6  9. a2a4  9... f6h5  10. h4g3  10... h5g3  11. h2g3  11... c6b8  12. c4a2 A novelty. White is waiting for  his opponent to show his cards. 12... b8d7 Basso needs to develop. 13. d3d4 Now the knight cannot  torture the enemy center. 13... c7c6  14. d1c2  14... d8c7  15. g3g4 Topalov would naturally try to exploit the half-open h-file for  the attack. 15... c6c5  16. g4g5  16... h6g5 This might not be Black's best choice. 17. e1c1  17... e7f6 Basso needs the bishop to protect the h8 spot. 18. h1h2 To  which the former world champion reacts without hesitation. 18... g7g6  19. d1h1  19... c5d4  20. h2h6 The threat of a capture on g6 is deadly.  20... g8g7 The critical position of the game. After dozen minutes of  thought Topalov came up with the cunning: 21. d2b1 The exclamation mark is for the remarkable idea of the move.  But oddly enough, despite all the hidden beauty this is not the optimal  solution. 21... d7c5 The only move. 22. f3d4 The brilliant point behind Topalov's play. 22... c8d7 This natural development does not solve Black's problems. 23. h6h7  23... g7g8  24. d4b5  24... c7d8 Best. 25. b5d6 The obvious capture gives a chance to Black to swap off a major  attacker. 25... d7e6 Without the light-squared bishop White's attack loses its  steam. 26. a2e6 