[Event "Olympiad-23"]
[Site "Buenos Aires"]
[Date "1978.11.10"]
[Round "14"]
[White "Petursson, Margeir"]
[Black "Aldrete, Jorge"]
[Result "1-0"]
[WhiteElo "2350"]
[BlackElo "2310"]

1. c4 Nf6 2. Nc3 g6 3. e4 d6 4. d4 Bg7 5. f3 O-O 6. Be3 e5 7. d5 a5 8. Bd3 Nbd7 9. Nge2 Nc5 10. Bc2 Bd7 11. Qd2 Rb8 12. a3 b6 13. b4 Nb7 14. Rb1 axb4 15. axb4 Ra8 16. O-O Kh8 17. Nc1 Ng8 18. Nd3 f5 19. f4 exf4 20. Bxf4 h6 21. e5 Ra3 22. Rf3 g5 23. Bg3 f4 24. Bxf4 gxf4 25. Nxf4 Ne7 26. e6 Be8 27. Re1 c5 28. dxc6 Rxf4 29. Rxf4 Rxc3 30. cxb7 Qc7 31. Ref1 Rxc2 32. Qxc2 Bg6 33. Rf8+ Kh7 34. b8=Q Qxb8 35. Qxg6+ Kxg6 36. Rxb8 Nc6 37. Rg8 Kh7 38. Rc8 1-0