[Event "Interzonal-07"]
[Site "Sousse"]
[Date "1967.11.09"]
[Round "19"]
[White "Ivkov, Borislav"]
[Black "Byrne, Robert Eugene"]
[Result "1/2-1/2"]

1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 c5 5. a3 Bxc3+ 6. bxc3 Qc7 7. Nf3 Ne7 8. a4 b6 9. Bb5+ Bd7 10. O-O Bxb5 11. axb5 a5 12. Ng5 h6 13. Nh3 Nd7 14. Nf4 O-O 15. Nh5 Kh8 16. Qg4 Rg8 17. Qh3 Nf8 18. Qf3 Neg6 19. Ba3 Nh7 20. Rae1 Rac8 21. Bc1 cxd4 22. cxd4 Nh4 23. Qf4 Ng6 24. Qf3 Nh4 25. Qf4 Ng6 1/2-1/2