[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "1"]
[White "Johner, Hans"]
[Black "Crabbendam, Henrico"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 c5 3. d5 e5 4. Nc3 d6 5. e4 g6 6. Bd3 Bg7 7. Nf3 O-O 8. O-O a6 9. Ne1 Nbd7 10. Be3 Rb8 11. a4 Ne8 12. Qd2 Nc7 13. f4 exf4 14. Bxf4 Ne5 15. Nf3 Bd7 16. Nxe5 Bxe5 17. Bxe5 dxe5 18. Qh6 Qe7 19. Rf3 b5 20. axb5 axb5 21. Raf1 b4 22. Ne2 Bg4 23. Rg3 Bxe2 24. d6 Qxd6 25. Rh3 Qd4+ 26. Kh1 Bh5 27. Rxh5 gxh5 28. Qg5+ Kh8 29. Qf6+ Kg8 30. Rf3 h4 31. Qg5+ Kh8 32. Qf6+ Kg8 33. Qg5+ Kh8 34. Qf6+ Kg8 1/2-1/2