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

1. Nf3 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 O-O 5. O-O c6 6. Nc3 d5 7. cxd5 cxd5 8. d4 Nc6 9. Ne5 e6 10. Bf4 Nxe5 11. Bxe5 Bd7 12. Qb3 Bc6 13. e3 Qe7 14. Rfc1 Rfc8 15. Bf1 Bf8 16. Bxf6 Qxf6 17. Rc2 Qd8 18. Rac1 Qd7 19. Bb5 Bxb5 20. Nxb5 Rxc2 21. Rxc2 a6 22. Nc3 Rc8 23. Ne2 b5 1/2-1/2