[Event "URS-ch25 Semifinal"]
[Site "Leningrad"]
[Date "1957.12.07"]
[Round "17"]
[White "Shamkovich, Leonid Alexandrovic"]
[Black "Krogius, Nikolai V"]
[Result "1/2-1/2"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 b6 6. f3 Ba6 7. e4 d5 8. cxd5 Bxf1 9. Kxf1 exd5 10. e5 Ng8 11. Ne2 Qd7 12. g4 Nc6 13. Kg2 O-O-O 14. Ng3 f6 15. Re1 Re8 16. f4 Nh6 17. h3 f5 18. g5 Nf7 19. h4 g6 20. h5 Nfd8 21. Qd3 Kb7 22. Kf3 Ne6 23. Ra2 Na5 24. Rh1 Nc4 25. a4 a5 26. Qd1 Rhg8 27. hxg6 hxg6 1/2-1/2