[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "5"]
[White "Wolthuis, Willem"]
[Black "Enevoldsen, Jens"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. Bg5 h6 8. Bf4 c5 9. d5 a6 10. a4 Ne8 11. Qd2 Kh7 12. O-O b6 13. Rfe1 Ne5 14. Nxe5 dxe5 15. Be3 Nd6 16. a5 Bd7 17. axb6 Qxb6 18. b4 Nb7 19. Reb1 Qc7 20. Na4 Bxa4 21. Rxa4 h5 22. Rba1 cxb4 23. Rxa6 Rxa6 24. Rxa6 b3 25. Qb4 Bh6 26. Bxh6 Kxh6 27. Qxb3 Kg7 28. Rc6 Qd7 29. Qa4 f6 30. Qa7 Rc8 31. Qb6 Nd6 32. f3 Rxc6 33. dxc6 Qc8 34. c7 Kf7 35. Qb8 Qa6 36. Kf2 Qc6 37. Kg3 Qc5 38. h3 g5 39. Qh8 h4+ 40. Kh2 Qxc7 1/2-1/2