[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.02"]
[Round "7"]
[White "Hort, Vlastimil"]
[Black "Ivkov, Borislav"]
[Result "0-1"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Qc2 c5 5. dxc5 O-O 6. Bf4 Na6 7. a3 Bxc3+ 8. Qxc3 Nxc5 9. Rd1 d5 10. f3 Bd7 11. e3 Rc8 12. b3 Qb6 13. b4 Na4 14. Qc2 a5 15. Kf2 axb4 16. Rb1 dxc4 17. Rxb4 Qa7 18. Rxc4 Nd5 19. Qe4 Nac3 20. Qd4 Qxa3 21. Nh3 f6 22. Rxc8 Rxc8 23. Bc4 b5 24. Bd3 e5 25. Bxe5 fxe5 26. Qh4 e4 27. fxe4 Rf8+ 0-1