[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "6"]
[White "Portisch, Lajos"]
[Black "Hartoch, Robert G"]
[Result "1-0"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 4. Nf3 Nf6 5. Bf4 O-O 6. e3 Nbd7 7. a3 c6 8. h3 a6 9. c5 b6 10. b4 a5 11. Bd3 Ba6 12. b5 Bb7 13. cxb6 Qxb6 14. O-O c5 15. Na4 Qa7 16. dxc5 Bxc5 17. Nxc5 Nxc5 18. Be5 Rac8 19. Be2 Nfd7 20. Bd4 f6 21. Rc1 e5 22. Bb2 a4 23. h4 Qb6 24. h5 Qe6 25. Nh4 f5 26. Nf3 Nb3 27. Rxc8 Rxc8 28. Nd2 Ndc5 29. Nxb3 Nxb3 30. Bd3 d4 31. Re1 Qd5 32. e4 fxe4 33. Bxe4 Qxb5 34. Bxb7 Qxb7 35. Rxe5 Qd7 36. Qd3 h6 37. Qe4 Qf7 38. Bxd4 Nxd4 39. Qxd4 Re8 40. Rd5 Re1+ 41. Kh2 Qc7+ 42. g3 Qf7 43. Kg2 Qb7 44. f3 Re2+ 45. Kf1 Re8 46. Qxa4 Rf8 47. Qc4 Qf7 48. f4 Kh8 49. Qd3 Re8 50. Kg2 Qb7 51. Qb5 Qa8 52. Kh2 Qc8 53. Rd2 Qa8 54. Rd5 Rf8 55. Qd3 Re8 56. Rd7 Qa5 57. f5 Qc5 58. Rd8 Rxd8 59. Qxd8+ Kh7 60. Qd3 Kh8 61. Kh3 Kg8 62. Qb3+ Kh7 63. Qf7 Qc1 64. Qg6+ Kh8 65. Qe8+ Kh7 66. Qe4 Kh8 67. f6 gxf6 68. Qe8+ Kg7 69. Qg6+ Kh8 70. Qxf6+ Kh7 71. Qf3 Kg7 72. a4 Qc5 73. Qe2 Kf7 74. Qg4 Kf8 75. Qf4+ Kg7 76. Qg4+ Kh8 77. Qe2 Kg7 78. a5 Qc1 79. Kh2 Qc5 80. a6 Kf8 81. Kh3 Kg7 82. Kh2 Kf8 83. Kg2 Kg7 84. Qa2 Qa7 85. Qb2+ Kg8 86. Qb3+ Kf8 87. Qf3+ Ke8 88. Qc6+ Kf8 89. Qc8+ 1-0