[Event "IBM"]
[Site "Amsterdam"]
[Date "1969.??.??"]
[Round "12"]
[White "Barendregt, Johan"]
[Black "Langeweg, Kick"]
[Result "0-1"]

1. e4 c5 2. Nf3 e6 3. c3 Nf6 4. Bd3 Nc6 5. O-O d5 6. e5 Nd7 7. Re1 Qc7 8. Qe2 b6 9. Na3 a6 10. Bb1 b5 11. Nc2 b4 12. cxb4 cxb4 13. d4 h6 14. Ne3 Be7 15. Nf1 a5 16. Ng3 Ba6 17. Qe3 a4 18. Nh5 Bf8 19. Nf4 Nb6 20. b3 Bb5 21. Bb2 Na7 22. Rc1 Qd7 23. a3 axb3 24. Qxb3 Bc4 25. Qd1 b3 26. Bd3 Na4 27. Qd2 Rc8 28. Bxc4 dxc4 29. Ne2 Nb5 30. Nc3 Nbxc3 31. Rxc3 Be7 32. Rac1 Nxc3 33. Qxc3 O-O 34. Nd2 Qa4 35. Nb1 Bg5 36. Rf1 Bd8 37. Qe3 Ba5 38. Nc3 Qd7 39. Rc1 Rfd8 40. Rd1 Bxc3 41. Qxc3 Qd5 42. f3 Qa8 0-1