[Event "IBM"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "4"]
[White "Zuidema, Coen"]
[Black "Bouwmeester, Hans"]
[Result "1/2-1/2"]

1. e4 c6 2. d4 d5 3. Nc3 dxe4 4. Nxe4 Nd7 5. Bc4 Ngf6 6. Ng5 e6 7. Qe2 Nb6 8. Bd3 h6 9. N5f3 c5 10. dxc5 Bxc5 11. Ne5 O-O 12. Ngf3 Nbd5 13. a3 a5 14. O-O b6 15. c4 Ne7 16. b3 Bb7 17. Bb2 Nf5 18. Qc2 Nd4 19. Nxd4 Bxd4 20. Rad1 Bxb2 21. Qxb2 Qe7 1/2-1/2