[Event "URS-ch39 Semifinal"]
[Site "Daugavpils"]
[Date "1971.06.??"]
[Round "?"]
[White "Karasev, Vladimir I"]
[Black "Ruderfer, Mark B"]
[Result "1-0"]

1. e4 e5 2. Nf3 Nc6 3. Bb5 d6 4. O-O Bd7 5. c4 g6 6. d4 exd4 7. Nxd4 Bg7 8. Bxc6 bxc6 9. Nc3 Nf6 10. Bg5 h6 11. Bh4 Qb8 12. Nb3 Be6 13. e5 dxe5 14. Bxf6 Bxf6 15. Qf3 Bg7 16. Nc5 O-O 17. Nxe6 fxe6 18. Qxc6 Qxb2 19. Nb5 Kh7 20. Rad1 Rab8 21. Qxc7 a6 22. Nd6 Qe2 23. Rde1 Qxa2 24. c5 Rb4 25. c6 Rd4 26. Qe7 Qd5 27. Ne8 1-0