Chess puzzle (Checkmate)
Opening: Queens_Gambit_Declined, Queens_Gambit_Declined_Marshall_Defense
Moves: 1. d4 d5 2. c4 Nf6 3. cxd5 Qxd5 4. Nc3 Qa5 5. Bd2 Qb6 6. Nf3 h6 7. Qc2 a6 8. e3
c6 9. Bd3 Bg4 10. Ne5 Nbd7 11. Nxg4 Nxg4 12. O-O e6 13. h3 Ngf6 14. a4 g5 15.
Rab1 g4 16. hxg4 Nxg4 17. b4 Be7 18. b5 Qc7 19. bxc6 *
Position (FEN): r3k2r/1pqnbp2/p1P1p2p/8/P2P2n1/2NBP3/2QB1PP1/1R3RK1 b kq - 0 19
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 825
Best move: Qh2#