Chess puzzle (Checkmate)
Opening: Russian_Game, Russian_Game_Three_Knights_Game
Moves: 1. e4 e5 2. Nf3 Nf6 3. Nc3 d5 4. exd5 Nxd5 5. Nxe5 Nxc3 6. dxc3 Qe7 7. Qe2 Bf5
8. Nd3 Nc6 9. Be3 O-O-O 10. O-O-O h5 11. g3 Be4 12. f3 Bd5 13. Nf4 Bxa2 14. b3
*
Position (FEN): 2kr1b1r/ppp1qpp1/2n5/7p/5N2/1PP1BPP1/b1P1Q2P/2KR1B1R b - - 0 14
Black to move.
Themes:  Opening Mate in 1 
Puzzle rating: 860
Best move: Qa3#