[Event "IBM"]
[Site "Amsterdam"]
[Date "1966.07.31"]
[Round "6"]
[White "Botvinnik, Mikhail"]
[Black "Zuidema, Coen"]
[Result "1-0"]

1. Nf3 Nf6 2. g3 g6 3. Bg2 Bg7 4. O-O O-O 5. c4 d5 6. cxd5 Nxd5 7. d4 c5 8. dxc5 Na6 9. c6
bxc6 10. Nbd2 Qc7 11. a3 c5 12. Nc4 Bb7 13. Qc2 Rac8 14. Rd1 Rfd8 15. Bd2 Nb8 16. Bh3 e6
17. e4 Nb6 18. Bf4 Qc6 19. Nd6 Rxd6 20. Rxd6 Qxe4 21. Qxe4 Bxe4 22. Ng5 Bd5 23. Nxe6 fxe6
24. Rxd5 exd5 25. Bxc8 Nxc8 26. Bxb8 Bxb2 27. Rb1 Bxa3 28. Rb7 c4 29. Be5 Bf8 30. Kf1 Ne7
31. Bd6 Kf7 32. Rxa7 Ke6 33. Ra6 Bg7 34. f4 Kd7 35. Bxe7 Kxe7 36. Ra7+ Kf8 37. Rc7 c3 38.
Ke2 h6 39. Kd3 d4 40. g4 Bf6 41. h4 Kg8 42. Ke4 Bg7 43. g5 hxg5 44. hxg5 Kf8 45. Kd3 Kg8
46. Rc6 Kf7 47. Ke4 Bh8 48. Rc7+ Kg8 49. Rc8+ Kh7 50. f5 gxf5+ 51. Kxf5 Bg7 52. Re8 d3 53.
g6+ Kh6 54. Re3 Bd4 55. Rxd3 c2 56. Rh3+ Kg7 57. Rh7+ 1-0