[Event "Interzonal-09a"]
[Site "Leningrad"]
[Date "1973.06.17"]
[Round "11"]
[White "Karpov, Anatoly"]
[Black "Byrne, Robert Eugene"]
[Result "1/2-1/2"]

1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be6 8. f4 Qc7 9. f5 Bc4 10. a4 Nbd7 11. Be3 Be7 12. a5 O-O 13. O-O b5 14. axb6 Nxb6 15. Kh1 Rfc8 16. Bxb6 Qxb6 17. Bxc4 Rxc4 18. Qe2 Rac8 19. Ra2 Bd8 20. Rfa1 Qb7 21. Ra4 Rxa4 1/2-1/2