[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "7"]
[White "Langeweg, Kick"]
[Black "Byrne, Robert Eugene"]
[Result "0-1"]

1. d4 Nf6 2. Nf3 g6 3. b3 Bg7 4. Bb2 O-O 5. g3 d6 6. Bg2 c6 7. O-O a5 8. a4 Na6 9. Nbd2 Bd7 10. e4 Rb8 11. e5 dxe5 12. Nxe5 Bf5 13. Ndc4 Nd5 14. Qd2 Nab4 15. c3 Na6 16. f4 f6 17. Nf3 b6 18. Nh4 Bc8 19. Rae1 Rf7 20. Qd3 e6 21. Nf3 Bf8 22. h4 b5 23. axb5 cxb5 24. Ncd2 Nac7 25. h5 gxh5 26. Nh4 f5 27. Ndf3 Rg7 28. Ne5 Bb7 29. Ra1 Be7 0-1