[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "11"]
[White "Crabbendam, Henrico"]
[Black "De Rooi, Paul"]
[Result "0-1"]

1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 e5 5. Nb5 a6 6. Nd6+ Bxd6 7. Qxd6 Qf6 8. Qc7 Nge7 9. Nc3 O-O 10. Be3 d6 11. O-O-O Rd8 12. Bc4 Bg4 13. f3 Rd7 14. Qb6 Nc8 15. Qb3 Na5 16. Qa4 Nxc4 17. Qxc4 Be6 18. Qa4 Qd8 19. b3 Ne7 20. Rd2 b5 21. Qa3 Rc8 22. Ne2 a5 23. Rhd1 b4 24. Qb2 a4 25. Kb1 Qc7 26. f4 f6 27. bxa4 Ra8 28. f5 Bf7 29. a5 Rxa5 30. Nc1 Qc6 31. Nb3 Ra3 32. Kc1 Qxe4 33. Nc5 dxc5 34. Rxd7 Qxe3+ 35. Kb1 Bxa2+ 36. Qxa2+ Rxa2 37. Kxa2 Nxf5 38. g4 Nd4 39. Rd3 b3+ 40. Ka3 bxc2 0-1