[Event "URS-ch25 Semifinal"]
[Site "Leningrad"]
[Date "1957.11.20"]
[Round "7"]
[White "Krogius, Nikolai V"]
[Black "Estrin, Yakov Borisovich"]
[Result "1-0"]

1. c4 e6 2. d4 Nf6 3. Nc3 d5 4. Bg5 Nbd7 5. e3 c6 6. cxd5 exd5 7. Bd3 Be7 8. Qc2 Nf8 9. Nf3 Ne6 10. Bh4 g6 11. h3 Nh5 12. Bxe7 Qxe7 13. O-O-O Nhg7 14. g4 Nc7 15. Kb1 Be6 16. Na4 O-O-O 17. Nc5 Nce8 18. Ne5 Nd6 19. Rc1 Kb8 20. Qa4 f6 21. Nf3 Bc8 22. Rc3 Qc7 23. Rhc1 Ne6 24. Ra3 b5 25. Qb4 Nxc5 26. dxc5 Nf7 27. Nd4 a6 28. Ra5 Ne5 29. Be2 Bb7 30. a4 Rhe8 31. axb5 axb5 32. Rc3 Kc8 33. b3 Kd7 34. f4 Nf7 35. Bxb5 Ra8 36. Rxa8 Rxa8 37. Rc2 Qa5 38. Qxa5 Rxa5 39. Be2 Nd8 40. Ra2 Rxc5 41. Kb2 Ne6 42. Nxe6 Kxe6 43. b4 1-0