[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "5"]
[White "De Rooi, Paul"]
[Black "Langeweg, Kick"]
[Result "0-1"]

1. e4 c5 2. Ne2 Nf6 3. Nbc3 d6 4. g3 Nc6 5. Bg2 g6 6. O-O Bg7 7. d3 O-O 8. h3 Ne8 9. Be3 Nd4 10. Kh2 Bd7 11. Qd2 Rc8 12. Rae1 Bc6 13. f4 f5 14. Nd1 e6 15. c3 Nxe2 16. Qxe2 b6 17. Bd2 Nc7 18. Nf2 Qd7 19. g4 Rce8 20. g5 e5 21. fxe5 Bxe5+ 22. Kg1 d5 23. Bc1 Bg3 24. Rd1 Qe6 25. Qc2 dxe4 26. dxe4 Bxf2+ 27. Rxf2 Bxe4 28. Qa4 Bxg2 29. Rxg2 a5 30. h4 f4 31. Bxf4 b5 0-1