[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "11"]
[White "Kuijpers, Frans"]
[Black "Wolthuis, Willem"]
[Result "1-0"]

1. Nf3 d5 2. g3 Bf5 3. Bg2 e6 4. O-O Nf6 5. d3 h6 6. c4 c6 7. Nbd2 a5 8. cxd5 exd5 9. e4 dxe4 10. dxe4 Be6 11. e5 Nh7 12. Ne4 Qxd1 13. Rxd1 Nd7 14. Be3 O-O-O 15. Nd6+ Bxd6 16. Rxd6 Kc7 17. Nd4 Nxe5 18. Rxe6 fxe6 19. Bf4 Nf6 20. Bxe5+ Kb6 21. Nxe6 Rd2 22. Bd4+ 1-0