[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "9"]
[White "Tatai, Stefano"]
[Black "Barendregt, Johan"]
[Result "1/2-1/2"]

1. e4 d6 2. d4 Nf6 3. Nc3 e5 4. Nf3 Nbd7 5. g3 g6 6. Bg2 Bg7 7. O-O O-O 8. Re1 c6 9. a4 Re8 10. h3 Qc7 11. Be3 b6 12. dxe5 dxe5 13. a5 b5 14. Nd2 Nf8 15. b4 Ne6 16. Na2 Ba6 17. Qb1 Red8 18. Nb3 Bf8 19. Qb2 Rd7 20. Rad1 Rad8 21. Qa1 Be7 22. Rxd7 Rxd7 23. Rd1 Rxd1+ 24. Qxd1 c5 25. bxc5 Nxc5 26. Nxc5 Bxc5 27. Bxc5 Qxc5 28. Qf3 Ne8 29. Qc3 Qxc3 30. Nxc3 Nd6 31. f3 Bb7 32. Bf1 Bc6 33. Na2 Nb7 34. a6 Nc5 35. Nb4 Bd7 36. Nd5 Kf8 37. Nc7 b4 38. Nd5 b3 39. cxb3 Nxb3 40. Nf6 Ke7 41. Nxh7 Nd2 42. Bg2 Bb5 43. f4 Bxa6 44. fxe5 Bb7 45. Kf2 Nc4 46. Nf6 Nxe5 47. Nd5+ Bxd5 48. exd5 f5 49. Ke3 Kd6 50. Kd4 Nd7 51. g4 fxg4 52. hxg4 g5 53. Ke4 a5 54. Kf5 Nc5 55. Bf1 Kxd5 56. Bb5 1/2-1/2