[Event "IBM"]
[Site "Amsterdam"]
[Date "1972.??.??"]
[Round "?"]
[White "Enklaar, Bert F"]
[Black "Ivkov, Borislav"]
[Result "1/2-1/2"]

1. d4 e6 2. c4 f5 3. g3 Nf6 4. Bg2 c6 5. Nf3 d5 6. O-O Bd6 7. b3 Qe7 8. Bb2 O-O 9. Nbd2 Bd7 10. Ne5 Be8 11. f3 Bh5 12. Qc2 Nbd7 13. Kh1 Rac8 14. e3 Bc7 15. a4 Rfd8 16. Rfc1 Qe8 17. c5 Nxe5 18. dxe5 Nd7 19. f4 a5 20. Bd4 Rb8 21. Qc3 Qe7 22. Bf1 Rdc8 23. Ra2 Be8 24. Nf3 Ra8 25. Ne1 Bh5 26. Kg2 b6 27. Nd3 Qd8 28. Rac2 Be8 29. Be2 bxc5 30. Nxc5 Nxc5 31. Bxc5 Bb6 32. Qd4 Rcb8 33. Rc3 Ra7 34. Rd1 Bxc5 35. Qxc5 Qe7 36. Rdd3 Qxc5 37. Rxc5 Kf7 38. Kf2 Ke7 39. Ke1 Rb6 40. Kd2 Kd8 41. Kc3 Kc7 42. Kb2 h5 43. Ka3 g6 44. Rdc3 Bd7 45. Rc1 Ra8 46. h3 Rab8 47. R1c3 Ra8 48. Bd1 Rbb8 49. Rc2 Kb6 50. Rc1 Rb7 51. b4 axb4+ 52. Kxb4 Rba7 53. Bb3 Ra5 54. R1c2 R8a7 55. R2c3 Ra8 56. Rc2 R8a7 57. R2c3 1/2-1/2