Ivkov, Borislav VS Ree, Hans 1972.??.??

[Event "IBM"]
[Site "Amsterdam"]
[Date "1972.??.??"]
[Round "?"]
[White "Ivkov, Borislav"]
[Black "Ree, Hans"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. e3 O-O 6. Bd2 c5 7. dxc5 Na6 8. cxd5 Nxd5 9. Nxd5 Qxd5 10. Bxa6 bxa6 11. Bc3 Bxc3+ 12. bxc3 Qxc5 13. Qd4 Qa5 14. O-O Bb7 15. Rab1 Bxf3 16. gxf3 Qxa2 17. c4 Rac8 18. Qxa7 e6 19. Ra1 Qxc4 20. Qxa6 Qd5 21. Qe2 Rc4 22. f4 Rfc8 23. Rfd1 Qe4 24. Qb2 Qf5 25. Rdc1 Qg4+ 26. Kf1 Rxc1+ 27. Rxc1 Rxc1+ 28. Qxc1 1/2-1/2