A nice tactic that I've seen several times in training but I missed it OTB. Black to move and win.

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[Event "Rated game"]
[Site "http://lichess.org/zpgy3yrt"]
[Date "2013.12.06"]
[White "Vassyliy1942"]
[Black "QxV"]
[Result "1-0"]
[WhiteElo "1715"]
[BlackElo "1752"]
[PlyCount "47"]
[Variant "Standard"]
[TimeControl "300+5"]
[ECO "D31"]
[Opening "Queen's Gambit Declined, Charousek (Petrosian) Variation"]
[Annotator "lichess.org"]

1. d4 d5 2. c4 e6 3. Nc3 Be7 { Queen's Gambit Declined, Charousek (Petrosian) Variation } 4. Nf3 c6 5. Bf4 dxc4?! { (0.32 → 0.88) Inaccuracy. The best move was Nf6. } (5... Nf6 6. e3 Nbd7 7. cxd5 cxd5 8. Bd3 Nh5 9. Be5 O-O 10. O-O) 6. a4 Nf6 7. e4 Bb4 8. Qc2 b5 9. Be2 Qa5?! { (0.52 → 1.37) Inaccuracy. The best move was O-O. } (9... O-O 10. O-O Qb6 11. b3 cxb3 12. Qxb3 Bxc3 13. Qxc3 b4 14. a5) 10. O-O Bxc3? { (1.33 → 2.82) Mistake. The best move was Qb6. } (10... Qb6 11. Bd2 Be7 12. axb5 cxb5 13. b3 b4 14. Na4 Qc6 15. e5) 11. bxc3 Qb6?! { (2.56 → 3.39) Inaccuracy. The best move was Qd8. } (11... Qd8 12. Rfb1 Ba6 13. axb5 Bxb5 14. Bc1 Nbd7 15. Ba3 Nb6 16. Nd2) 12. Bd6? { (3.39 → 2.32) Mistake. The best move was Rfb1. } (12. Rfb1 a5 13. Bxc4 Ba6 14. axb5 cxb5 15. Bxb5+ Bxb5 16. c4 Nc6) 12... Nbd7? { (2.32 → 3.39) Mistake. The best move was Qd8. } (12... Qd8 13. e5 Nd5 14. Nd2 a5 15. Ne4 Na6 16. Qa2 b4 17. Qxc4) 13. Rfd1? { (3.39 → 2.26) Mistake. The best move was Rfb1. } (13. Rfb1 a6 14. Bxc4 Qd8 15. Bd3 Nb6 16. e5 Nfd5 17. a5 Nc4) 13... c5?? { (2.26 → 5.33) Blunder. The best move was a5. } (13... a5 14. Nd2 Qd8 15. Rdb1 Ba6 16. e5 Nd5 17. Ne4 f5 18. exf6) 14. dxc5 Nxc5 15. axb5?? { (5.89 → 0.00) Blunder. The best move was a5. } (15. a5 Qb7 16. Bxc5 Qxe4 17. Qb2 Ba6 18. Ba3 Qb7 19. Ng5 Nd5) 15... Nfxe4? { (0.00 → 1.71) Mistake. The best move was Ncxe4. } (15... Ncxe4 16. Bg3 Nxg3 17. hxg3 Qxb5 18. Nd4 Qc5 19. Ra4 O-O 20. Rxc4) 16. Bxc4?? { (1.71 → -3.65) Blunder. The best move was Bxc5. } (16. Bxc5 Nxc5 17. Ne5 O-O 18. Nxc4 Qb8 19. Nd6 Qb6 20. Qb2 Bd7) 16... Nxd6 17. Rd4 Nxc4 18. Rxc4 O-O 19. Rh4 f5 20. Ne5?! { (-4.88 → -5.49) Inaccuracy. The best move was Rb4. } (20. Rb4 Bb7 21. Nd4 Bd5 22. Rd1 a5 23. bxa6 Qxa6 24. Nb5 Be4) 20... Ne4 21. Qe2?! { (-5.19 → -6.00) Inaccuracy. The best move was Qb2. } (21. Qb2 Rfd8 22. Rxe4 fxe4 23. Nc6 Rd6 24. Qc1 Qxb5 25. Ne7+ Kf8) 21... Qc5 22. Qh5? { (-5.91 → -8.56) Mistake. The best move was Nc6. } (22. Nc6 Bd7 23. Qh5 Bxc6 24. Qxh7+ Kf7 25. Qh5+ Ke7 26. bxc6 g5) 22... Qxf2+ 23. Kh1 Qg1+?? { (-8.88 → 10.42) Blunder. The best move was h6. } (23... h6 24. Ng6 Bb7 25. Qf3 Qc5 26. Rf1 Rf6 27. Nf4 Qxb5 28. Qd3) 24. Kxg1 { Black resigns } 1-0

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