[Event "IBM"]
[Site "Amsterdam"]
[Date "1972.??.??"]
[Round "?"]
[White "Donner, Jan Hein"]
[Black "Browne, Walter Shawn"]
[Result "1/2-1/2"]

1. d4 c5 2. d5 Nf6 3. c4 e6 4. Nc3 exd5 5. cxd5 d6 6. Nf3 g6 7. e4 Bg7 8. Be2 O-O 9. O-O a6 10. a4 Bg4 11. Nd2 Bxe2 12. Qxe2 Nbd7 13. Nc4 Nb6 14. Ne3 Qe7 15. a5 Nbd7 16. Nc4 Ne5 17. Nb6 Rae8 18. Bg5 Qc7 19. f3 h6 20. Bd2 Ned7 21. Nc4 Ne5 22. Ne3 Nh5 23. g3 Nf6 24. Kg2 Re7 25. Na4 Qd7 26. Nc3 Rb8 27. Rfe1 Qc7 28. f4 Ned7 29. Qd3 b5 30. axb6 Nxb6 31. Rxa6 c4 32. Qc2 Rbe8 33. e5 dxe5 34. fxe5 Rxe5 35. Rxb6 Qxb6 36. Nxc4 Qd4 37. Nxe5 Rxe5 38. Rxe5 Qxe5 39. Qd3 Nd7 40. Bf4 Qe1 41. Qe3 Qxe3 42. Bxe3 Kf8 43. Ne4 Bxb2 44. Bxh6+ Ke7 45. Bg5+ f6 46. Be3 Be5 47. Kf3 f5 48. Nc5 Nf6 49. Nd3 Kd6 50. Bf4 Bxf4 51. Kxf4 Nxd5+ 52. Kg5 Ne3 53. Ne1 Kd5 54. Nf3 Ke4 55. Nd2+ Kd3 56. Nf3 Ke4 57. Nd2+ Kd3 1/2-1/2