[Event "URS-ch25 Semifinal"]
[Site "Sverdlovsk"]
[Date "1957.11.15"]
[Round "4"]
[White "Polugaevsky, Lev"]
[Black "Prokhorovich, Taras E"]
[Result "1/2-1/2"]

1. d4 d5 2. c4 c6 3. e3 Bf5 4. cxd5 cxd5 5. Qb3 Bc8 6. Nf3 e6 7. Bd3 Nf6 8. Nc3 Be7 9. O-O O-O 10. Ne5 b6 11. Bd2 Bb7 12. Rac1 Ne4 13. Nxe4 dxe4 14. Bb5 Bd5 15. Bc4 f6 16. Bxd5 Qxd5 17. Qxd5 exd5 18. Nc6 Nxc6 19. Rxc6 Rfd8 20. Rfc1 Bd6 21. f3 Kf7 22. Be1 f5 23. Bh4 Rd7 24. Kf2 f4 25. Bg5 fxe3+ 26. Bxe3 Re8 1/2-1/2