[Event "Interzonal-11b"]
[Site "Rio de Janeiro"]
[Date "1979.10.17"]
[Round "18"]
[White "Portisch, Lajos"]
[Black "Kagan, Shimon"]
[Result "0-1"]
[WhiteElo "2640"]
[BlackElo "2445"]

1. Nf3 d6 2. d4 g6 3. c4 Bg7 4. Nc3 Nd7 5. e4 e5 6. Be2 Ne7 7. dxe5 dxe5 8. b3 O-O 9. O-O b6 10. Ba3 Re8 11. h4 Bb7 12. Ng5 h6 13. Nf3 Nc6 14. h5 g5 15. Nh2 Nd4 16. Ng4 Nf6 17. Nxf6+ Qxf6 18. Bg4 Bf8 19. Bb2 c6 20. Ne2 Rad8 21. Nxd4 exd4 22. Qd3 c5 23. Rae1 Bd6 24. g3 Re7 25. Re2 Rde8 26. Rfe1 a6 27. Bf5 Qg7 28. Kh2 Bc8 29. Bxc8 Rxc8 30. Bc1 Re5 31. Kg2 Rce8 32. Bd2 g4 33. Bf4 R5e6 34. Qd2 Be5 35. Qd3 Qf6 36. Bd2 Qg7 37. Rh1 Rf6 38. b4 Rf3 39. Qb1 d3 40. Ree1 Bd4 41. Rhf1 Qe5 42. Be3 Bxe3 0-1