[Event "IBM"]
[Site "Amsterdam"]
[Date "1966.08.04"]
[Round "9"]
[White "Zuidema, Coen"]
[Black "Van Scheltinga, Theo D"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f4 Be7 10. Nf3 b5 11. Bxf6 gxf6 12. f5 Qb6 13. Bd3 O-O-O 14. Kb1 Ne5 15. Rhf1 Ng4 16. Rde1 Bf8 17. Nd1 Bh6 18. Qc3+ Kb7 19. h3 Rc8 20. Qb3 Ne5 21. Nxe5 fxe5 22. Rf3 Rc7 23. Nf2 Rhc8 24. a3 a5 25. c3 b4 26. axb4 axb4 27. Qxb4 Qxb4 28. cxb4 Bd2 29. Rd1 Rc1+ 30. Rxc1 Rxc1+ 31. Ka2 exf5 32. exf5 Bc6 33. Be4 d5 34. b5 dxe4 35. bxc6+ Kxc6 36. Nxe4 Bb4 37. Kb3 Re1 38. Kxb4 Rxe4+ 39. Kc3 Re2 40. Rg3 Rf2 41. Rg7 Rxf5 42. Rxh7 Rf2 43. Rg7 Kd5 44. h4 e4 45. h5 Rf5 46. h6 Rh5 47. h7 Ke6 48. Kd4 Kf6 49. g4 Rh2 50. Rg8 Rxh7 51. Kxe4 Rh4 52. Kd5 Ke7 53. Kc5 f6 54. b4 Kf7 55. Rd8 Rxg4 56. b5 Rg1 57. Rd2 Rc1+ 58. Kd6 Rb1 59. Rd5 Kg6 60. Kc7 f5 61. b6 Kg5 62. b7 Kg4 63. Rd1 Rb2 64. Rd2 Rb1 65. Rd6 Rxb7+ 66. Kxb7 f4 1/2-1/2