Chess puzzle (Checkmate)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Scandinavian_Variation
Moves: 1. e4 d5 2. exd5 Qxd5 3. d4 Nc6 4. Nf3 Bg4 5. Be2 O-O-O 6. c4 Qf5 7. Be3 h5 8.
Nc3 Nf6 9. h3 Bxf3 10. Bxf3 g5 11. Qa4 Nxd4 12. O-O-O e5 13. Qxa7 *
Position (FEN): 2kr1b1r/Qpp2p2/5n2/4pqpp/2Pn4/2N1BB1P/PP3PP1/2KR3R b - - 0 13
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1051
Best move: Qc2#