Chess puzzle (Checkmate)
Opening: Nimzowitsch_Defense, Nimzowitsch_Defense_Colorado_Countergambit
Moves: 1. e4 Nc6 2. Nf3 f5 3. Nc3 fxe4 4. Nxe4 d5 5. Ng3 e5 6. d3 Bg4 7. h3 Be6 8. Be2
Qf6 9. Bg5 Qg6 10. Qd2 Be7 11. Bxe7 Ngxe7 12. O-O-O e4 13. dxe4 dxe4 14. Nh4
Qf7 15. b3 O-O 16. f3 Qf6 17. Nxe4 *
Position (FEN): r4rk1/ppp1n1pp/2n1bq2/8/4N2N/1P3P1P/P1PQB1P1/2KR3R b - - 0 17
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1057
Best move: Qa1#