[Event "IBM"]
[Site "Amsterdam"]
[Date "1971.07.23"]
[Round "9"]
[White "Ree, Hans"]
[Black "Langeweg, Kick"]
[Result "1-0"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 O-O 5. a3 Bxc3+ 6. Qxc3 b6 7. Bg5 Bb7 8. e3 d6 9. f3 Nbd7 10. Bd3 c5 11. Ne2 Rc8 12. O-O h6 13. Bh4 d5 14. cxd5 cxd4 15. Qxd4 e5 16. Bxf6 Qxf6 17. Qg4 Nc5 18. Be4 Ba6 19. Rf2 Qd6 20. Nc3 Nd3 21. Bxd3 Bxd3 22. Qb4 Qxb4 23. axb4 a6 24. Rd2 Bc4 25. e4 Rfd8 26. Na4 Rb8 27. Rc2 Bb5 28. b3 Kf8 29. Rc7 Rd7 30. Rxd7 Bxd7 31. Nb2 Bb5 32. Rc1 Rb7 33. Rc8+ Ke7 34. Nc4 f6 35. Kf2 1-0