[Event "Interzonal-09a"]
[Site "Leningrad"]
[Date "1973.06.09"]
[Round "6"]
[White "Byrne, Robert Eugene"]
[Black "Estevez Morales, Guillermo"]
[Result "1-0"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 e6 6. g4 h6 7. h3 a6 8. Bg2 Bd7 9. Be3 Nc6 10. Qe2 Rc8 11. f4 Nxd4 12. Bxd4 Qa5 13. e5 dxe5 14. Qxe5 Qb4 15. a3 Qd6 16. Bxb7 Rb8 17. Bxa6 Bc6 18. O-O Qd8 19. Bb5 Bxb5 20. Nxb5 Rc8 21. Rac1 Be7 22. Na7 1-0