[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "9"]
[White "Johner, Hans"]
[Black "Wolthuis, Willem"]
[Result "0-1"]

1. c4 c6 2. d4 d5 3. Nc3 Nf6 4. Nf3 dxc4 5. a4 Bf5 6. e3 e6 7. Bxc4 Bb4 8. O-O O-O 9. Ne2 h6 10. Ng3 Bh7 11. Qe2 Nbd7 12. e4 Qe7 13. Rd1 Rad8 14. Bf4 Nb6 15. Bb3 c5 16. a5 Nc8 17. h3 cxd4 18. Nxd4 a6 19. e5 Nd5 20. Bd2 Bc5 21. Nf3 Na7 22. Ne4 Bb4 23. Bxd5 Rxd5 24. Bxb4 Rxd1+ 25. Rxd1 Qxb4 26. Nd6 Nc6 27. Rc1 Rb8 28. Rc4 Qxa5 29. Nxb7 Rxb7 30. Rxc6 Qa1+ 31. Kh2 Bg6 32. Rxa6 Qxb2 33. Ra8+ Kh7 34. Qxb2 Rxb2 35. Kg3 Rb5 36. Ra7 Bh5 37. Kf4 g5+ 38. Ke3 Rb3+ 39. Ke4 Bxf3+ 40. gxf3 Rb4+ 41. Ke3 Kg6 42. Ra1 Rh4 43. Rh1 0-1