[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.04"]
[Round "9"]
[White "Tan, Lian Ann"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Bd3 Nc6 6. Nxc6 bxc6 7. O-O d5 8. exd5 cxd5 9. c4 Be7 10. cxd5 Qxd5 11. Nc3 Qb7 12. Bg5 Bd7 13. Qe2 Bc6 14. Bb5 O-O 15. Bxc6 Qxc6 16. Rac1 Qb7 17. Rc2 h6 18. Bh4 Rfd8 19. Rfc1 Rd4 20. Bg3 Rad8 21. h3 Rd3 22. Be5 a5 23. Bxf6 Bxf6 24. Ne4 Be7 25. Rc7 Rd1+ 26. Rxd1 Rxd1+ 27. Qxd1 Qxc7 28. Qd4 f5 29. Nc3 Bc5 30. Qd2 Kf7 31. Ne2 Bb4 32. Qe3 Kf6 33. Nf4 Qd6 34. Nd3 Qd5 35. Nxb4 Qd1+ 36. Kh2 Qd6+ 37. f4 axb4 38. a3 g5 39. g3 bxa3 40. bxa3 Qd5 41. fxg5+ hxg5 1/2-1/2