[Event "IBM"]
[Site "Amsterdam"]
[Date "1965.??.??"]
[Round "4"]
[White "Barendregt, Johan"]
[Black "Filip, Miroslav"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 e6 3. b4 cxb4 4. d4 Nf6 5. Bd3 Nc6 6. O-O d6 7. c4 bxc3 8. Nxc3 Be7 9. d5 exd5 10. exd5 Nb8 11. Nd4 O-O 12. Re1 Re8 13. Bg5 h6 14. Bh4 g5 15. Bg3 Bf8 16. Rxe8 Nxe8 17. Qf3 Bg7 18. Re1 Nd7 19. Nf5 Ne5 20. Bxe5 dxe5 21. Nxg7 Kxg7 22. Rxe5 Nf6 23. Ne4 Bg4 24. Qg3 Nxe4 25. Rxe4 Bf5 1/2-1/2