[Event "IBM"]
[Site "Amsterdam"]
[Date "1963.??.??"]
[Round "5"]
[White "De Rooi, Paul"]
[Black "Langeweg, Kick"]
[Result "0-1"]

1. e4 c5 2. Ne2 Nf6 3. Nbc3 d6 4. g3 Nc6 5. Bg2 g6 6. d3 Bg7 7. Nf4 Bg4 8. f3 Bd7 9. g4 e5 10. Nfe2 h5 11. g5 Nh7 12. h4 f6 13. Nd5 fxg5 14. hxg5 O-O 15. Be3 Nd4 16. f4 Bg4 17. Bxd4 cxd4 18. Qd2 exf4 19. Nexf4 Qxg5 20. O-O Rf7 21. Qb4 Be5 22. Qb3 Qh4 23. Rf2 Raf8 24. Ne7+ Qxe7 25. Nxg6 Qe6 26. Nxf8 Nxf8 27. Rxf7 Qxf7 28. Qxf7+ Kxf7 29. Rf1+ Ke7 30. Bf3 Bh3 31. Bg2 Be6 32. Bf3 h4 33. Bh5 Nh7 34. Bg6 Ng5 35. Bf5 Nh3+ 36. Kg2 Nf4+ 37. Kf3 Bxf5 38. exf5 Kf6 39. Kg4 h3 40. Rh1 b5 41. b4 a6 42. a3 d5 43. Ra1 h2 44. Rh1 Ne2 0-1