[Event "IBM"]
[Site "Amsterdam"]
[Date "1973.??.??"]
[Round "4"]
[White "Andersson, Ulf"]
[Black "Langeweg, Kick"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. c4 e6 3. b3 c5 4. g3 Nc6 5. Bg2 Be7 6. O-O O-O 7. Bb2 d5 8. e3 d4 9. exd4 cxd4 10. Re1 d3 11. a3 a5 12. Nc3 Nd7 13. Nb5 Nc5 14. Ne5 Nxe5 15. Bxe5 Bd7 16. b4 Bxb5 17. cxb5 Nd7 18. Bc3 axb4 19. axb4 Qb6 20. Qf3 Rab8 21. Qxd3 Nf6 22. Ra5 Rfd8 23. Qe3 Qxe3 24. fxe3 Nd5 25. Bxd5 Rxd5 26. Rea1 Rdd8 27. Kf2 f6 28. Ke2 e5 29. Rf1 Bd6 30. Raa1 Kf7 31. Rfc1 Ke6 32. e4 1/2-1/2