[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.21"]
[Round "8"]
[White "Langeweg, Kick"]
[Black "Donner, Jan Hein"]
[Result "0-1"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. d4 O-O 5. e4 d6 6. Be2 e5 7. O-O Nc6 8. d5 Ne7 9. Ne1 Nd7 10. Nd3 f5 11. Bd2 Nf6 12. f3 f4 13. c5 g5 14. Rc1 Ng6 15. Nb5 Rf7 16. cxd6 cxd6 17. Qc2 Ne8 18. a4 h5 19. Nf2 Bf8 20. h3 Rg7 21. Qb3 Nh4 22. Rc2 Nf6 23. Rfc1 g4 24. fxg4 hxg4 25. hxg4 Bxg4 26. Bxg4 Nxg4 27. Nxg4 Rxg4 28. Be1 f3 29. Bxh4 Qxh4 30. Qxf3 Rxe4 31. g3 Qg4 32. Qxg4+ Rxg4 33. Rc4 Rxg3+ 34. Kf2 Rb3 35. Rg4+ Kf7 36. Rc7+ Kf6 37. Rg8 e4 38. Nc3 Rxb2+ 39. Ke1 Re8 40. Nd1 Rb3 41. Ke2 Ke5 42. Nc3 a6 43. Rc4 Kf5 44. Kd1 b5 45. axb5 axb5 46. Rxe4 Rc8 47. Rgg4 Bh6 0-1