[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "15"]
[White "Donner, Jan Hein"]
[Black "Andersson, Ulf"]
[Result "0-1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Bd3 O-O 6. Nf3 d5 7. O-O dxc4 8. Bxc4 Nbd7 9. Bd3 b6 10. a3 cxd4 11. exd4 Bxc3 12. bxc3 Bb7 13. Re1 Rc8 14. Bd2 Nc5 15. Be2 Nce4 16. c4 Nxd2 17. Qxd2 Bxf3 18. gxf3 Qd6 19. Qe3 Rfd8 20. Red1 g6 21. a4 Nh5 22. a5 Ng7 23. c5 bxc5 24. dxc5 Qc7 25. Qc3 e5 26. f4 Ne6 27. fxe5 Qxc5 28. Qxc5 Rxc5 29. Rxd8+ Nxd8 30. a6 Rxe5 31. Rd1 Nc6 32. Kf1 Kf8 33. Rc1 Nd4 34. Bd3 Re7 35. Kg2 Rd7 36. Be4 Ke7 37. Rc8 Ne6 38. Bb7 Rd8 39. Rc4 Rd4 40. Rc8 Rd8 41. Rc4 Rd3 42. f3 h6 43. Kf2 g5 44. Rc8 Rd8 45. Rc2 h5 46. Ke3 h4 47. Rc6 f5 48. Rc4 Kf6 49. Rc6 Ke5 50. Rc4 Rd1 51. Rc8 Rd8 52. Rc4 h3 53. Rc8 Rxc8 54. Bxc8 Nc5 55. Bb7 Nd7 56. Bc8 Nb6 57. Bb7 Nd7 58. Bc8 Nf8 59. Bb7 Ng6 60. Bc8 Nh4 61. Bb7 Ng2+ 62. Kf2 Kf4 63. Bc8 Nh4 64. Bb7 Ng6 65. Bc8 Ne5 66. Bb7 g4 67. fxg4 fxg4 68. Kg1 g3 69. Kh1 Kg4 0-1