[Event "IBM"]
[Site "Amsterdam"]
[Date "1968.??.??"]
[Round "4"]
[White "Bouwmeester, Hans"]
[Black "Lengyel, Levente"]
[Result "1-0"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 c5 5. Nf3 d5 6. Bd3 O-O 7. O-O Nbd7 8. cxd5 exd5 9. Qb3 Bxc3 10. Qxc3 b6 11. b3 Bb7 12. Bb2 Rc8 13. dxc5 bxc5 14. Bf5 Re8 15. Rfd1 h6 16. Rac1 Re7 17. Nd2 Qb6 18. Nf1 a5 19. Ng3 a4 20. Bh3 axb3 21. axb3 Ba8 22. e4 Rb8 23. exd5 Qxb3 24. Qxb3 Rxb3 25. d6 Re8 26. Bxf6 Nxf6 27. Rxc5 1-0