[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.07.24"]
[Round "1"]
[White "Ivkov, Borislav"]
[Black "Mecking, Henrique"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be6 8. O-O Be7 9. f4 Qc7 10. f5 Bc4 11. a4 O-O 12. Kh1 Nbd7 13. a5 Bb5 14. Nxb5 axb5 15. Bg5 b4 16. Bd3 Nc5 17. Qe1 Nxb3 18. cxb3 Rxa5 19. Rxa5 Qxa5 20. Bc4 Rc8 21. Qe2 h6 22. Bxf6 Bxf6 23. g3 Rc5 24. Kg2 b5 25. Bd5 Qc7 26. Kh3 Qa7 27. Qd2 Qa5 28. Qd1 Kf8 29. Qh5 Rc7 30. Rc1 Bg5 31. Rxc7 Qxc7 32. Qe2 Qa5 33. Qh5 Qc7 34. Qe2 Qa5 35. Qh5 1/2-1/2