[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "10"]
[White "De Rooi, Paul"]
[Black "Johner, Hans"]
[Result "0-1"]

1. c4 Nf6 2. Nc3 g6 3. d4 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. Bg5 e5 8. dxe5 dxe5 9. Qc2 c6 10. O-O Qe7 11. Rfd1 h6 12. Bd2 Nc5 13. Be1 a5 14. b3 Nh5 15. g3 f5 16. Nh4 Nf4 17. f3 Nxe2+ 18. Nxe2 Kh7 19. a3 fxe4 20. fxe4 Qf6 21. Kh1 Bg4 22. Bc3 Bf3+ 23. Nxf3 Qxf3+ 24. Kg1 Nxe4 25. Rd7 Nf2 0-1