[Event "IBM"]
[Site "Amsterdam"]
[Date "1961.??.??"]
[Round "1"]
[White "Langeweg, Kick"]
[Black "Bernstein, Ossip Samuel"]
[Result "1-0"]

1. c4 Nf6 2. Nc3 c5 3. g3 g6 4. Bg2 Bg7 5. Nf3 O-O 6. d4 cxd4 7. Nxd4 Nc6 8. Nc2 d6 9. O-O Bd7 10. b3 Qc8 11. Bb2 Bh3 12. Rb1 Bxg2 13. Kxg2 Qf5 14. f3 h5 15. Qd2 Rac8 16. e4 Qa5 17. Rf2 Kh7 18. Ne3 Bh6 19. Qe1 Ne5 20. Qe2 a6 21. Ned5 Nxd5 22. Nxd5 Qxa2 23. Qd1 Qa5 24. Nxe7 Rce8 25. Nd5 f5 26. exf5 Rxf5 27. f4 Ng4 28. Re2 Qd8 29. Kg1 Bg7 30. Bxg7 Kxg7 31. Qd4+ Kf7 32. Rbe1 Rxe2 33. Rxe2 Nf6 34. Re7+ Kf8 35. Rxb7 Qe8 36. Ne7 d5 37. Qa7 dxc4 38. Rb8 Qxb8 39. Nxg6+ 1-0