[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "7"]
[White "Hartoch, Robert G"]
[Black "Ivkov, Borislav"]
[Result "0-1"]

1. c4 e6 2. Nf3 d5 3. b3 c5 4. Bb2 Nc6 5. g3 Nf6 6. Bg2 Be7 7. O-O O-O 8. e3 b6 9. Qe2 Bb7 10. d3 Re8 11. Nc3 Bf8 12. Rfd1 d4 13. exd4 cxd4 14. Ne4 Nxe4 15. dxe4 e5 16. Ne1 a5 17. a3 Qb8 18. Rac1 Ba6 19. Bf1 Nd8 20. Qd2 Ne6 21. b4 Be7 22. Rb1 axb4 23. axb4 Qc7 24. b5 Bb7 25. f3 Bg5 26. Qc2 Nc5 27. Nd3 Be3+ 28. Kh1 f5 29. Nxc5 Qxc5 30. Bd3 fxe4 31. fxe4 Bc8 32. Ra1 Be6 33. Ra6 Bg4 34. Be2 Bxe2 35. Qxe2 Rac8 36. Ra4 Qc7 37. Bc1 Bxc1 38. Rxc1 Rf8 39. Kg2 Qd7 40. Qd3 Rf7 41. Rf1 Rxf1 42. Kxf1 Qh3+ 43. Kg1 h5 44. Ra1 h4 45. Rc1 Qg4 46. c5 bxc5 47. b6 Kh7 48. b7 Rb8 49. Rxc5 Rxb7 50. Rxe5 hxg3 51. hxg3 Rc7 52. Rf5 Rc3 53. Qxd4 Qxg3+ 54. Kf1 Rc1+ 55. Ke2 Qg2+ 56. Ke3 Re1+ 57. Kf4 Qh2+ 58. Kf3 0-1