Chess puzzle (Checkmate)
Opening: Sicilian_Defense, Sicilian_Defense_Kan_Variation
Moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 a6 5. Nc3 Qc7 6. Be3 Bb4 7. Bd2 Bc5 8.
Nb3 Ba7 9. Bd3 Nf6 10. O-O h5 11. h3 Ng4 12. Qf3 *
Position (FEN): rnb1k2r/bpqp1pp1/p3p3/7p/4P1n1/1NNB1Q1P/PPPB1PP1/R4RK1 b kq - 2 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 800
Best move: Qh2#