[Event "IBM"]
[Site "Amsterdam"]
[Date "1968.??.??"]
[Round "9"]
[White "Shamkovich, Leonid Alexandrovic"]
[Black "Zuidema, Coen"]
[Result "1-0"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Nxe4 6. d4 b5 7. Bb3 d5 8. dxe5 Be6 9. c3 Be7 10. Qe2 O-O 11. Bc2 Qd7 12. Rd1 f5 13. Nbd2 Nxd2 14. Bxd2 Na5 15. b3 Nb7 16. b4 a5 17. Nd4 c6 18. a4 axb4 19. cxb4 bxa4 20. Bxa4 Nd8 21. Rdc1 Qa7 22. Be3 Qb8 23. f4 Qxb4 24. Bxc6 Rxa1 25. Rxa1 Nxc6 26. Nxc6 Qb7 27. Qa6 Qc7 28. Rc1 Re8 29. Nb8 Bc5 30. Rxc5 Qxb8 31. h3 Qb3 32. Bf2 d4 33. Rc7 d3 34. Qa7 Bf7 35. Rd7 Qc4 36. Be3 Qa2 37. Qxa2 Bxa2 38. Rxd3 Be6 39. Ra3 Kf7 40. Bc5 Rd8 41. Bd6 Bd7 42. Ra7 Ke6 43. g4 g6 44. Kf2 Rc8 45. Kg3 h6 46. gxf5+ gxf5 47. Bc7 Bc6 48. Kh4 Bg2 49. Ra6+ Kf7 50. Rxh6 Kg7 51. Rh5 Rh8 52. Rxh8 Kxh8 53. Kg5 Bxh3 54. Kg6 Kg8 55. Bd6 Bf1 56. Kxf5 Kf7 57. e6+ 1-0