Chess puzzle (Checkmate)
Opening: Scandinavian_Defense, Scandinavian_Defense_Modern_Variation
Moves: 1. e4 d5 2. exd5 Nf6 3. Nc3 Nxd5 4. d3 Bf5 5. Nxd5 Qxd5 6. Nf3 c5 7. Be3 Nc6 8.
Qd2 e6 9. O-O-O Qxa2 10. Qc3 c4 11. dxc4 Bb4 12. Qb3 *
Position (FEN): r3k2r/pp3ppp/2n1p3/5b2/1bP5/1Q2BN2/qPP2PPP/2KR1B1R b kq - 2 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 885
Best move: Qa1#