[Event "IBM"]
[Site "Amsterdam"]
[Date "1967.??.??"]
[Round "3"]
[White "Kotov, Alexander"]
[Black "Donner, Jan Hein"]
[Result "1-0"]

1. c4 Nf6 2. Nc3 e6 3. Nf3 d5 4. cxd5 exd5 5. d4 c6 6. Bg5 Be7 7. e3 O-O 8. Bd3 Ne4 9. Bxe4 Bxg5 10. Bd3 Be7 11. Qc2 g6 12. O-O Nd7 13. Rab1 a5 14. a3 Bd6 15. b4 Nf6 16. Na4 axb4 17. axb4 Ne4 18. Nc5 Qe7 19. Nxe4 dxe4 20. Bxe4 Bxb4 21. Ne5 Bd6 22. Nc4 Bc7 23. g3 Re8 24. Bd3 Ra7 25. Rb2 Qf6 26. Rfb1 h5 27. Nd2 h4 28. Ne4 Qe7 29. Qc5 Ra5 30. Qxe7 Rxe7 31. Nc5 hxg3 32. hxg3 b6 33. Nb3 Ra3 34. Rc1 Be6 35. Bc4 Bxg3 36. Nd2 Bh4 37. Rxb6 Bxc4 38. Nxc4 Ra2 39. Rb2 Ra6 40. Ne5 Re6 41. Rbc2 Bf6 42. Nxc6 Rd6 43. Kg2 Kg7 44. Rc5 Ra3 45. R1c3 Ra2 46. Nb4 Rd2 47. Rc2 Rd1 48. Rc1 Rxc1 49. Rxc1 g5 50. Kf3 Be7 51. Nc6 Rf6+ 52. Ke4 Bf8 53. Rc2 Bd6 54. d5 Rh6 55. Nd4 Rh4+ 56. f4 1-0