[Event "IBM"]
[Site "Amsterdam"]
[Date "1967.??.??"]
[Round "9"]
[White "Ree, Hans"]
[Black "Zuidema, Coen"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 e6 4. O-O Be7 5. c4 O-O 6. b3 c5 7. Bb2 Nc6 8. cxd5 Nxd5 9. Nc3 Bf6 10. Rc1 Rb8 11. Qc2 Nxc3 12. Bxc3 b6 13. a3 Ba6 14. d3 Nd4 15. Nxd4 Bxd4 16. b4 Bxc3 17. Qxc3 Rc8 18. Qb3 Qd7 19. bxc5 Rxc5 20. Rxc5 bxc5 21. h4 Qb5 22. Rb1 Qxb3 23. Rxb3 Rc8 24. Bf3 1/2-1/2