[Event "Interzonal-09a"]
[Site "Leningrad"]
[Date "1973.06.07"]
[Round "4"]
[White "Quinteros, Miguel Angel"]
[Black "Estevez Morales, Guillermo"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. c4 b6 3. d3 g6 4. e4 d6 5. Nc3 Bg7 6. d4 O-O 7. Bd3 Bg4 8. Be3 Nfd7 9. Be2 c5 10. d5 Na6 11. h3 Bxf3 12. Bxf3 Nc7 13. Be2 e6 14. O-O exd5 15. exd5 f5 16. Qd2 Qe7 17. Rfe1 Rae8 18. Kh1 Qh4 19. f4 Rf7 20. Bd3 Bh6 21. Rf1 Rfe7 22. Rf3 Bg7 23. Bf2 Qh6 24. Re1 Ne5 25. Rfe3 Qxf4 26. Bf1 Bf6 27. Qc2 Nxc4 28. Rxe7 Rxe7 29. Rxe7 Bxe7 30. Qa4 Qxf2 31. Bxc4 Bg5 32. Ne2 b5 33. Bxb5 Nxb5 34. Qxb5 Qf1+ 35. Kh2 Bf4+ 36. g3 Qf2+ 37. Kh1 Qf3+ 38. Kh2 Qf2+ 39. Kh1 Qf3+ 40. Kh2 Be5 41. Qe8+ Kg7 42. Qe7+ Kh6 43. Qh4+ Kg7 44. Qe7+ Kh6 1/2-1/2