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

1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. c3 Nf6 5. Qe2 Qb6 6. Na3 a6 7. Bc4 Bg7 8. O-O O-O 9. Nc2 d6 10. d3 Na5 11. Ne3 Nxc4 12. Nxc4 Qc6 13. Bg5 b5 14. Ne3 Ra7 15. Nd2 Ne8 16. f4 b4 17. Rac1 bxc3 18. bxc3 f5 19. Nd5 Nf6 20. c4 Qe8 21. Rb1 fxe4 22. dxe4 Nxd5 23. exd5 Qa4 24. Rb8 Bf5 25. Rxf8+ Bxf8 26. g4 Bc8 27. f5 Qc2 28. f6 exf6 29. Qe8 Bd7 30. Qb8 Bxg4 31. Qxa7 1-0