[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.13"]
[Round "15"]
[White "Savon, Vladimir A"]
[Black "Portisch, Lajos"]
[Result "1/2-1/2"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4 c5 6. c3 Nc6 7. Ndf3 Qa5 8. Kf2 b5 9. Bd3 b4 10. Ne2 Nb6 11. Kg3 bxc3 12. bxc3 Ba6 13. h4 Be7 14. h5 Bxd3 15. Qxd3 Qa4 16. f5 Qc4 17. Qxc4 Nxc4 18. h6 g6 19. fxe6 fxe6 20. Rb1 O-O 21. Nf4 Nd8 22. Nh3 Rc8 23. Re1 cxd4 24. cxd4 Na3 25. Rb3 Nc2 26. Rd1 Rc4 27. Bg5 Nc6 28. Rb7 Rf7 29. Rdb1 Rb4 30. Bxe7 Rxb7 31. Rxb7 Nxe7 32. Rb8+ Rf8 33. Rxf8+ Kxf8 34. Nhg5 Nf5+ 35. Kf4 Ke7 36. Nxh7 Nxh6 37. g4 Nf7 38. Nhg5 Nd8 39. Nh4 Nxd4 40. Nxg6+ Ke8 1/2-1/2