[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.13"]
[Round "15"]
[White "Keres, Paul"]
[Black "Panno, Oscar"]
[Result "1/2-1/2"]
1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Qxd7 5. c4 e5 6. Nc3 Nc6 7. d3 g6 8. Nd5 Nce7 9. O-O Bg7 10. Rb1 Nxd5 11. cxd5 Ne7 12. b4 b6 13. bxc5 bxc5 14. Qb3 O-O 15. Qb7 Rad8 16. Bd2 Nc8 17. Ba5 Nb6 18. Qxd7 Rxd7 19. Bxb6 axb6 20. Rxb6 Ra8 21. Ra1 Ra3 22. Rb3 Rda7 23. Rxa3 Rxa3 24. Kf1 f5 25. Ne1 c4 26. dxc4 fxe4 27. Nc2 Ra4 28. Ne3 Bh6 29. Ke2 Kf7 30. Kd2 Ra3 31. Kc2 Bxe3 32. fxe3 Ke7 33. Kb2 Rxe3 34. a4 Kd8 35. a5 Kc7 36. Rf1 Rd3 37. Kc2 Rd4 38. Kc3 Kb7 39. Re1 Ka6 40. Kb4 Rd2 41. Rxe4 Rb2+ 1/2-1/2