[Event "IBM"]
[Site "Amsterdam"]
[Date "1967.??.??"]
[Round "4"]
[White "Zuidema, Coen"]
[Black "Donner, Jan Hein"]
[Result "0-1"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. O-O O-O 9. Be3 Qc7 10. a4 b6 11. Qd2 Be6 12. Rfd1 Nbd7 13. f3 Rfd8 14. Nc1 Nf8 15. Nd5 Nxd5 16. exd5 Bf5 17. c4 Nd7 18. a5 bxa5 19. Nb3 a4 20. Rxa4 Nc5 21. Nxc5 dxc5 22. Qa5 Qd6 23. b4 Bc2 24. bxc5 Qg6 25. Rda1 Bxa4 26. Qxa4 Rdb8 27. Rd1 Rb1 28. Bd3 Qxd3 0-1