[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "9"]
[White "Crabbendam, Henrico"]
[Black "Van den Berg, Carel"]
[Result "0-1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd3 d5 6. Nf3 c5 7. O-O Nc6 8. Ne2 cxd4 9. exd4 dxc4 10. Bxc4 b6 11. Bg5 Be7 12. a3 Bb7 13. b4 Nd5 14. Qd2 Bxg5 15. Nxg5 Nce7 16. Bd3 Nf5 17. Ng3 Qf6 18. Nxf5 exf5 19. Nf3 Rad8 20. Rfd1 Nc7 21. Qf4 Ne6 22. Qxf5 Qxf5 23. Bxf5 Bxf3 24. gxf3 Nxd4 25. Be4 f5 26. Bb7 Rd6 27. a4 Rb8 28. Bc6 Rg6+ 0-1