[Event "IBM"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "7"]
[White "Donner, Jan Hein"]
[Black "Barendregt, Johan"]
[Result "1-0"]

1. d4 d6 2. Nf3 Nf6 3. c4 Bf5 4. Nc3 Nbd7 5. Nh4 e6 6. g3 Ne4 7. Nxf5 exf5 8. Nxe4 fxe4 9. Bg2 f5 10. f3 d5 11. cxd5 Bb4+ 12. Bd2 Bxd2+ 13. Qxd2 Nf6 14. fxe4 fxe4 15. Qg5 O-O 16. O-O Qd7 17. Rf5 c6 18. Raf1 h6 19. Qg6 Nxd5 20. Bxe4 1-0