Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Semi-Tarrasch_Defense
Moves: 1. d4 e6 2. Nf3 d5 3. c4 c5 4. Bg5 Nf6 5. Nc3 Be7 6. e3 cxd4 7. exd4 Qb6 8. Qc2
Nbd7 9. c5 Qc7 10. Bd3 Nf8 11. Ne5 Ng6 12. Nxg6 fxg6 13. O-O O-O 14. Rae1 Ng4
15. h3 *
Position (FEN): r1b2rk1/ppq1b1pp/4p1p1/2Pp2B1/3P2n1/2NB3P/PPQ2PP1/4RRK1 b - - 0 15
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 789
Best move: Qh2#