[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "14"]
[White "Marovic, Drazen"]
[Black "Donner, Jan Hein"]
[Result "1-0"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O 6. Be3 Qe7 7. Bg5 Na6 8. Nf3 Nxc5 9. Nd2 h6 10. Bh4 b6 11. a3 Bxc3 12. Qxc3 g5 13. Bg3 Bb7 14. f3 d5 15. b4 Ncd7 16. h4 Nh5 17. Bf2 Rac8 18. hxg5 Qxg5 19. Qd4 Ng3 20. Rh3 Nf5 21. Qc3 Qg7 22. Qxg7+ Kxg7 23. cxd5 exd5 24. g4 Nd6 25. Bd4+ f6 26. e3 Ne5 27. Be2 Rfe8 28. f4 Nc6 29. Bb2 d4 30. Nb3 Rxe3 31. Rxe3 dxe3 32. Rd1 Rd8 33. b5 Ne7 34. g5 hxg5 35. fxg5 Ng8 36. Nd4 Re8 37. Nc6 Nf7 38. Rd7 Bc8 39. Rxa7 Kg6 40. Bc4 Be6 41. Bxe6 Rxe6 42. Ra8 Nxg5 43. Rxg8+ Kh7 44. Rxg5 fxg5 45. Ke2 Re4 46. Bd4 g4 47. Bxb6 g3 48. Bc7 g2 49. Bh2 Rh4 50. Bg1 Rh1 51. Bxe3 Ra1 52. b6 Rxa3 53. Bg1 Ra2+ 54. Kf3 Rb2 55. Na5 Kg6 56. b7 Kf6 57. Bf2 1-0