Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Alapin_Variation
Moves: 1. e4 c5 2. c3 Nc6 3. Bb5 d5 4. Bxc6+ bxc6 5. Qh5 e6 6. e5 g6 7. Qf3 Bg7 8. d4
cxd4 9. cxd4 Qa5+ 10. Bd2 Qb5 11. b3 Ba6 12. a4 *
Position (FEN): r3k1nr/p4pbp/b1p1p1p1/1q1pP3/P2P4/1P3Q2/3B1PPP/RN2K1NR b KQkq - 0 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1251
Best move: Qf1#