[Event "URS-ch25 Semifinal"]
[Site "Leningrad"]
[Date "1957.12.04"]
[Round "16"]
[White "Krogius, Nikolai V"]
[Black "Ravinsky, Grigory Ionovich"]
[Result "1-0"]

1. c4 e6 2. Nc3 d5 3. d4 Nf6 4. cxd5 exd5 5. Bg5 Be7 6. e3 O-O 7. Bd3 Nbd7 8. Qc2 Re8 9. Nf3 Nf8 10. O-O c6 11. Rab1 a5 12. a3 Bg4 13. Ne5 Bh5 14. b4 axb4 15. axb4 Ng4 16. Bxe7 Qxe7 17. Nxg4 Bxg4 18. b5 Rad8 19. bxc6 bxc6 20. Ne2 Rd6 21. Ng3 Qg5 22. Rb6 Bd7 23. Bf5 Bxf5 24. Qxf5 Qd8 25. Rfb1 Rf6 26. Qc2 Qd6 27. Qa4 Rg6 28. Qb4 Qe6 29. Rb8 Nd7 30. Rxe8+ Qxe8 31. Qb7 Re6 32. Ra1 Nf8 33. Ra8 Qe7 34. Qxe7 Rxe7 35. Rc8 Re6 36. Ne2 g5 37. Ng3 f6 38. Nf5 h5 39. h3 g4 40. hxg4 hxg4 41. Kh2 Kf7 42. Kg3 Kg6 43. Nh4+ 1-0