Chess puzzle (Checkmate)
Moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Bc5 4. Bc4 d6 5. d3 Na5 6. Bb3 Nxb3 7. axb3 c6 8.
Qe2 Bg4 9. h3 Bh5 10. Be3 Qf6 11. g4 Bg6 12. Bxc5 dxc5 13. Qe3 b6 14. Na4 Ne7
15. Nxb6 O-O 16. Nxa8 Rb8 17. Nc7 Rb7 18. Na6 c4 19. Nc5 Rb8 20. dxc4 Qd6 21.
Rxa7 f5 22. gxf5 Nxf5 23. exf5 Bxf5 24. Rg1 Bxc2 25. Rgxg7+ Kf8 26. Raf7+ Ke8
27. Nxe5 *
Position (FEN): 1r2k3/5RRp/2pq4/2N1N3/2P5/1P2Q2P/1Pb2P2/4K3 b - - 0 27
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 577
Best move: Qd1#