[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.20"]
[Round "7"]
[White "Langeweg, Kick"]
[Black "Hartoch, Robert G"]
[Result "1-0"]

1. Nf3 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. Qb3 Nb6 6. g3 Bg7 7. Bg2 O-O 8. O-O Nc6 9. d3 e5 10. Bg5 Qe8 11. Nb5 Qd7 12. Rac1 a6 13. Nc3 Qe8 14. Ne4 Be6 15. Qa3 f6 16. Bd2 Rf7 17. Nc5 Bf8 18. b4 a5 19. b5 Na7 20. Qc3 Nxb5 21. Qa1 Bxc5 22. Rxc5 Na4 23. Rcc1 c6 24. Be3 Nc7 25. Bh6 Qe7 26. Nd2 Bd5 27. e4 Be6 28. f4 exf4 29. Bxf4 Nb5 30. d4 Rd8 31. Nb3 Nb6 32. Rfd1 g5 33. Be3 Nc4 34. Bf2 Nbd6 35. Re1 Rc8 36. Bf1 b5 37. a4 bxa4 38. Qxa4 Nb2 39. Qa3 Bxb3 40. Qxb3 Qb7 41. Qe6 Rd8 42. Rb1 a4 43. e5 a3 44. exd6 Qb4 45. Rxb2 axb2 46. Bc4 Rf8 47. Ba2 Kg7 48. d7 Qa5 49. Rb1 Qc7 50. Rxb2 Rxd7 51. Re2 Ra8 52. Qe4 Kf8 53. Qf5 Qd8 54. Qc5+ Kg7 55. Qxc6 Rc8 56. Qe4 Rc1+ 57. Kg2 Kf8 58. Be6 Rdc7 59. h4 1-0