1. c4 Nf6 2. Nc3 d5 3. cxd5 Nxd5 4. g3 e5 5. Bg2 Nb6 6. Nf3 Nc6 7. O-O Be7 8. a3 O-O 9. b4 Re8 10. d3 Bf8 11. Bb2 Bg4 12. Ne4 a5 13. Nc5 e4 14. Nxe4 axb4 15. axb4 Bxb4 16. Rxa8 Qxa8 17. h3 Bd7 18. Qc1 Qd8 19. e3 Qe7

19... Bf8 (draw, 33) Gomez-Korchnoi, 1991.

20. Bc3 Bxc3 21. Qxc3 Qb4?

An error of judgment. The ending is good for White.

22. Qxb4 Nxb4 23. Nc5

The knight returns to this thematic square. The black pawns on b7 and c7 are weak.

23... Bc8 24. Rb1 N4d5 25. Rb3 Nf6 26. Nd4 Nfd7 27. Nxd7 Bxd7 28. Rc3 Na8 29. Bxb7

The exchange of pawns leaves the black c-pawn indefensible.

29... Bxh3 30. Nb5 Rb8 31. Bc6 Kf8 32. Ra3

White wants to win a pawn without giving up his bishop.

32... Nb6 33. Nxc7 Nc8 34. Ra8 Rb2?

Black should exchange rooks, when White has to play precisely to win.

35. Nd5 g5 36. g4 Bxg4 37. Nf6 Rc2 38. Bb7 Bf5 39. Bxc8 Bxc8 40. Nxh7+ Kg7 41. Nxg5 Kg6 42. Ra5 Bb7 43. Nh3 1-0 [Ludgate]