Chess puzzle (Checkmate)
Moves: 1. Nf3 Nc6 2. g3 e5 3. d3 d5 4. Nbd2 Nf6 5. e4 d4 6. Bg2 Bd6 7. O-O Be6 8. Re1
h6 9. h3 Qd7 10. g4 g5 11. Nf1 O-O-O 12. a4 Rdg8 13. Ng3 Bb4 14. Bd2 Bxd2 15.
Qxd2 h5 16. Nxg5 hxg4 17. Nxe6 Qxe6 18. hxg4 Nxg4 19. Nf5 Nh2 20. Qe2 Nf3+ 21.
Qxf3 Qg6 22. b4 Qh7 23. b5 *
Position (FEN): 2k3rr/ppp2p1q/2n5/1P2pN2/P2pP3/3P1Q2/2P2PB1/R3R1K1 b - - 0 23
Black to move.
Themes: Pin Middlegame Mate in 1 
Puzzle rating: 1919
Best move: Qh1#