Chess puzzle (Checkmate)
Opening: Horwitz_Defense, Horwitz_Defense_Other_variations
Moves: 1. d4 e6 2. Nc3 Nc6 3. Bf4 Bd6 4. Bxd6 cxd6 5. Nf3 Nf6 6. Nb5 Qa5+ 7. Nc3 e5 8.
dxe5 dxe5 9. e3 d6 10. Qxd6 Ne4 11. Qd3 Bf5 12. O-O-O Nxc3 13. Qxc3 Qxa2 14.
Bd3 e4 15. Qxg7 O-O-O 16. Ne5 exd3 17. Nxd3 Nb4 18. Nxb4 *
Position (FEN): 2kr3r/pp3pQp/8/5b2/1N6/4P3/qPP2PPP/2KR3R b - - 0 18
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1101
Best move: Qa1#