[Event "Interzonal-09b"]
[Site "Petropolis"]
[Date "1973.08.02"]
[Round "7"]
[White "Portisch, Lajos"]
[Black "Kagan, Shimon"]
[Result "1-0"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 c6 6. Be3 Nbd7 7. Bd3 a6 8. Nge2 O-O 9. O-O b5 10. Qd2 e5 11. Rad1 Qc7 12. Rc1 b4 13. Nd1 c5 14. dxe5 dxe5 15. Bg5 Nb8 16. Ne3 Nc6 17. Nd5 Qd6 18. Bb1 Kh8 19. Rfd1 Nd7 20. Qe1 Qb8 21. Qh4 f6 22. Bd2 Nb6 23. f4 Ra7 24. Rf1 Raf7 25. Ng3 Bd7 26. f5 g5 27. Qg4 Nd4 28. Ne2 Nxd5 29. exd5 Nxe2+ 30. Qxe2 Qd6 31. Be4 Re7 32. h4 gxh4 33. Qh5 Rg8 34. Qxh4 Bf8 35. Bxb4 Reg7 36. Bd2 Rg4 37. Qe1 Qb8 38. b3 Qe8 39. Rc3 Bd6 40. Rh3 Qf7 41. Qe2 Qe7 42. Rh2 Qg7 43. Bh6 Qf7 44. Bd2 Qg7 45. Rf3 Rg3 46. Rxg3 Qxg3 1-0