[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "1"]
[White "Langeweg, Kick"]
[Black "Donner, Jan Hein"]
[Result "0-1"]

1. Nf3 c5 2. c4 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g3 Bb4 7. Bg2 O-O 8. O-O d5 9. cxd5 exd5 10. Be3 Be6 11. Rc1 Qe7 12. Nxc6 bxc6 13. Na4 Qb7 14. Bc5 Bxc5 15. Nxc5 Qb6 16. Qd4 Bf5 17. Rfd1 Rfe8 18. e3 Rac8 19. Rd2 h6 20. f3 Nd7 21. Nxd7 Bxd7 22. Rc5 Re7 23. b4 Rce8 24. Rd3 Bc8 25. b5 cxb5 26. Rxd5 Be6 27. Qxb6 axb6 28. Rd6 Bc4 29. Rc3 Rxe3 30. Rxe3 Rxe3 31. Rxb6 Re1+ 32. Kf2 Re2+ 33. Kg1 Rxa2 34. f4 Kf8 35. Rb7 Rxg2+ 0-1