[Event "IBM"]
[Site "Amsterdam"]
[Date "1970.07.28"]
[Round "12"]
[White "Langeweg, Kick"]
[Black "Hartoch, Robert G"]
[Result "1/2-1/2"]

1. Nf3 g6 2. e4 Bg7 3. d4 d6 4. Be2 Nf6 5. Nc3 O-O 6. O-O c6 7. a4 a5 8. e5 Nfd7 9. exd6 exd6 10. Bf4 d5 11. Na2 Nf6 12. Ne5 Nbd7 13. Nd3 Ne4 14. c3 Ndf6 15. Qb3 Re8 16. Rae1 Bf8 17. Nac1 Bd6 18. Ne5 Bxe5 19. dxe5 Nd7 20. Nd3 g5 21. Be3 Nxe5 22. Nxe5 Rxe5 23. Bd3 Qe7 24. Qd1 Bf5 25. f4 gxf4 26. Bxf4 Re6 27. Qf3 Bg6 28. Bxe4 Bxe4 29. Qh5 Rg6 30. Rf2 Qe6 31. Qe5 Qxe5 32. Bxe5 f5 33. g3 Kf7 34. Bd4 Ke6 35. Ra1 h5 36. Rf4 Rg4 37. Rxg4 hxg4 38. b4 Kd6 39. Kf2 Re8 40. Bb6 Bf3 41. Ra2 axb4 42. cxb4 1/2-1/2