Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 d5 3. Nc3 e6 4. Bg5 h6 5. Bxf6 Qxf6 6. Nf3 dxc4 7. e4 b5 8.
Nxb5 Bb4+ 9. Nd2 Qe7 10. Bxc4 a6 11. Nc3 Qg5 12. O-O e5 13. Nf3 Qf4 14. Nd5
Qxe4 15. Nxb4 Qg6 16. Nxe5 Qb6 17. Bxf7+ Kf8 18. a3 Bf5 19. Qf3 Qf6 20. Qxa8
Ke7 21. Nec6+ Kxf7 22. Nxb8 Rd8 23. N4c6 Re8 24. Rfe1 Rxe1+ 25. Rxe1 Qg5 26.
Re7+ Kg6 27. Ne5+ Kh7 28. Nbc6 *
Position (FEN): Q7/2p1R1pk/p1N4p/4Nbq1/3P4/P7/1P3PPP/6K1 b - - 6 28
Black to move.
Themes:  Endgame Back Rank Mate, Mate in 1 
Puzzle rating: 677
Best move: Qc1#