[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "10"]
[White "Hartoch, Robert G"]
[Black "Tatai, Stefano"]
[Result "1/2-1/2"]

1. c4 g6 2. g3 Bg7 3. Bg2 c5 4. Nc3 Nc6 5. a3 e6 6. e4 Nge7 7. Nge2 O-O 8. O-O a6 9. Rb1 b5 10. cxb5 axb5 11. b4 cxb4 12. axb4 d5 13. d3 d4 14. Nxb5 Rb8 15. Na3 Rxb4 16. Rxb4 Nxb4 17. Qb3 Nbc6 18. Bd2 e5 19. f4 Be6 20. Qc2 Qc8 21. Nb5 Qd7 22. Qc5 Rb8 23. Rc1 Na5 24. Bxa5 Rxb5 25. Qc7 Qxc7 26. Bxc7 Rb2 27. Bf1 Bg4 28. Kf2 exf4 29. Bxf4 f5 30. e5 Nd5 31. Ke1 Bxe2 32. Bxe2 Nc3 33. Bf1 Kf7 34. Ra1 Rb1+ 35. Rxb1 Nxb1 36. Bg2 Ke6 37. Bb7 Bxe5 38. Bc1 Nc3 39. Ba6 Kf6 40. Bc4 g5 41. Kf2 f4 42. g4 Bd6 43. Kf3 Ke5 44. h3 Bb4 45. Kf2 Kd6 46. Kf3 Kc5 47. h4 h6 48. Be6 Kd6 49. Bg8 Kc6 50. hxg5 hxg5 51. Be6 Kd6 52. Bb3 Ke5 53. Bc4 Na4 54. Bb3 Nb6 55. Bc2 Nd7 56. Bb3 Nf8 1/2-1/2