[Event "Interzonal-09a"]
[Site "Leningrad"]
[Date "1973.06.07"]
[Round "4"]
[White "Byrne, Robert Eugene"]
[Black "Smejkal, Jan"]
[Result "1/2-1/2"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bb7 7. d4 Nxd4 8. Nxd4 exd4 9. c3 Nxe4 10. Re1 Be7 11. Qg4 O-O 12. Rxe4 Bxe4 13. Qxe4 Bf6 14. Bd2 Re8 15. Qf3 c6 16. cxd4 d5 17. Nc3 Bxd4 18. Rc1 Qf6 19. Qxf6 Bxf6 20. Kf1 Rac8 21. Bc2 g6 22. Bd3 c5 23. Nxd5 Bxb2 24. Rc2 Bd4 25. Ba5 Kg7 26. Be2 Rc6 27. Bf3 Rd6 28. g3 g5 29. Nc3 c4 30. Ne4 Rg6 31. g4 Be5 32. Ng3 Bxg3 33. hxg3 Rd6 34. Bb4 Rd3 35. Be2 Rd7 36. a4 f6 37. a5 Re6 38. Bc5 Rd5 39. Be3 Rd7 40. Ke1 Red6 41. Bc5 1/2-1/2