[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.07.30"]
[Round "6"]
[White "Hug, Werner"]
[Black "Portisch, Lajos"]
[Result "0-1"]

1. e4 e6 2. d4 d5 3. Nd2 Nf6 4. e5 Nfd7 5. f4 c5 6. c3 Nc6 7. Ndf3 cxd4 8. cxd4 Nb6 9. Bd3 Bd7 10. Ne2 h5 11. O-O g6 12. Bd2 Nb4 13. Bxb4 Bxb4 14. a3 Be7 15. Nc3 Kf8 16. Ng5 Rc8 17. Qf3 Nc4 18. Nxd5 exd5 19. Qxd5 Be6 20. Nxe6+ fxe6 21. Qxd8+ Bxd8 22. Rac1 Nb6 23. Bxg6 Rxc1 24. Rxc1 Nd5 25. Be4 Bb6 26. Bxd5 exd5 27. Rd1 Ke7 28. Kf2 Rc8 29. Rd2 Ke6 30. g3 Rc4 31. Ke3 Rc1 32. Kd3 Re1 33. Rc2 Rd1+ 34. Ke2 Rxd4 35. Rc8 Rc4 36. Re8+ Kf5 37. Kd3 Rd4+ 38. Kc3 Re4 39. Rg8 Re2 40. Rg5+ Ke4 41. e6 Bd4+ 42. Kb4 Rxb2+ 43. Ka4 Bc3 44. Re5+ Kd4 0-1