[Event "URS-ch23 Semifinal"]
[Site "Leningrad"]
[Date "1955.11.11"]
[Round "1"]
[White "Krogius, Nikolai V"]
[Black "Estrin, Yakov Borisovich"]
[Result "1/2-1/2"]

1. Nf3 Nf6 2. g3 d5 3. Bg2 Bf5 4. O-O c6 5. d3 h6 6. Nbd2 Bh7 7. c4 e6 8. b3 Nbd7 9. Bb2 Be7 10. Rc1 O-O 11. Qc2 a5 12. a3 Qb6 13. h3 Nh5 14. Kh2 Bc5 15. e3 Qc7 16. Qc3 Qd6 17. Ra1 Qe7 18. Rfe1 Nhf6 19. Kg1 Rfd8 20. e4 d4 21. Qc2 e5 22. Nh4 Qe6 1/2-1/2