[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.28"]
[Round "13"]
[White "Bobotsov, Milko Georgiev"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. d4 g6 2. c4 Bg7 3. Nc3 d6 4. e4 e5 5. Nge2 Nc6 6. d5 Nce7 7. f3 f5 8. Bg5 h6 9. Be3 Nf6 10. Qd2 h5 11. O-O-O fxe4 12. Nxe4 Nf5 13. Bg5 Nxe4 14. fxe4 Qxg5 15. Qxg5 Bh6 16. Qd2 Bxd2+ 17. Kxd2 Nh6 18. h3 Ke7 19. Nc3 Bd7 20. Be2 h4 21. Rdf1 Raf8 22. Rxf8 Rxf8 23. Rf1 Rf4 24. b4 b6 25. c5 dxc5 26. bxc5 Rxf1 27. Bxf1 bxc5 28. Bb5 Nf7 29. Bxd7 Kxd7 30. Na4 c4 31. Nc5+ Kc8 32. Ne6 Nd6 33. Ng5 c6 34. dxc6 Kc7 35. Ke3 Kxc6 36. Nf3 Kc5 37. Nxe5 g5 38. Nf3 Nf7 39. Nd4 a5 40. a3 Nd8 41. Nf3 Ne6 42. Kd2 a4 43. Ke3 Nf4 44. Nxg5 Nxg2+ 45. Kd2 Kd4 46. Kc2 Ne1+ 47. Kd2 Ng2 48. Kc2 Ne3+ 49. Kc1 Kc3 50. e5 Kb3 51. e6 Nd5 52. Nf3 c3 53. Nd4+ Kxa3 54. Kc2 Kb4 55. Ne2 Ne3+ 56. Kd3 Nf5 57. Nxc3 a3 58. Na2+ Kb3 59. Nc3 Ne7 60. Kd4 Nc6+ 61. Kd3 Kb4 62. Na2+ Kc5 63. Nc3 Ne7 64. Kc2 Kc4 65. Nb1 Kb4 66. Nxa3 Kc5 1/2-1/2