Chess puzzle (Checkmate)
Moves: 1. e4 d5 2. exd5 Nf6 3. Nf3 Bg4 4. Be2 Qxd5 5. Nc3 Qa5 6. d3 Nc6 7. Bd2 Qf5 8.
h3 Bxf3 9. Bxf3 e5 10. O-O Bc5 11. Ne4 Nxe4 12. Bxe4 Qe6 13. Qf3 Nd4 14. Qg4 f5
15. Qxg7 Rg8 16. Qxc7 Rc8 17. Qxb7 fxe4 18. Qxe4 Qxh3 19. g3 Ne2+ 20. Qxe2
Qxg3+ 21. Kh1 *
Position (FEN): 2r1k1r1/p6p/8/2b1p3/8/3P2q1/PPPBQP2/R4R1K b - - 1 21
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 839
Best move: Qg2#