[Event "Interzonal-12a"]
[Site "Las Palmas"]
[Date "1982.07.29"]
[Round "13"]
[White "Petrosian, Tigran V"]
[Black "Karlsson, Lars"]
[Result "1/2-1/2"]
[WhiteElo "2605"]
[BlackElo "2500"]

1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Be7 7. Nc3 Ne4 8. d5 Nxc3 9. Bxc3 Bf6 10. Rc1 O-O 11. O-O d6 12. Nd2 Bxc3 13. Rxc3 Kh8 14. Qc2 Nd7 15. e4 a6 16. Rd1 Qe7 17. Nf1 Nc5 18. Ne3 a5 19. b3 e5 20. Qb1 Rae8 21. Bh3 g6 22. Rd2 Qg5 23. a3 a4 24. b4 Nb3 25. Rb2 f5 26. exf5 Bc8 27. Bg2 gxf5 28. Nf1 f4 29. Qe1 Qh5 30. f3 Nd4 31. g4 Bxg4 32. fxg4 Qxg4 33. Qe4 Rg8 34. h3 Qd1 35. Kh2 Qa1 36. Qb1 Qxb1 37. Rxb1 e4 38. Re1 e3 39. Nxe3 fxe3 40. Rexe3 Ref8 1/2-1/2