[Event "IBM"]
[Site "Amsterdam"]
[Date "1963.??.??"]
[Round "4"]
[White "Barendregt, Johan"]
[Black "Parma, Bruno"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Qe2 Bxb5 5. Qxb5+ Qd7 6. Qxd7+ Nxd7 7. c4 g6 8. Nc3 Ngf6 9. d3 Bg7 10. h3 O-O 11. Be3 Rfc8 12. Ke2 Nb8 13. Rab1 Nc6 14. a3 Nd7 15. Rhc1 a6 16. b4 Nd4+ 17. Bxd4 cxd4 18. Nd1 e6 19. a4 a5 20. b5 Nc5 21. Nb2 f5 22. exf5 gxf5 23. g4 fxg4 24. hxg4 Rf8 25. Rg1 d5 26. Rbc1 Rac8 27. Rg3 e5 28. Nh4 Bf6 29. Nf5 Bg5 30. Rh1 dxc4 31. Nxc4 e4 32. Ncd6 Nxd3 33. Nxc8 Nf4+ 34. Kd1 Rxc8 1/2-1/2