Chess puzzle (Checkmate)
Moves: 1. f4 d6 2. Nf3 Nf6 3. e3 Bg4 4. Be2 Nc6 5. O-O Qd7 6. b3 O-O-O 7. Bb2 e5 8.
fxe5 Nxe5 9. Nxe5 Bxe2 10. Qxe2 dxe5 11. Bxe5 Ng4 12. Bb2 Bd6 13. h3 h5 14.
hxg4 hxg4 15. Kf2 Qc6 16. Nc3 Rh2 17. Rg1 f5 18. d4 Qe8 19. Rae1 Qh5 20. Qf1 *
Position (FEN): 2kr4/ppp3p1/3b4/5p1q/3P2p1/1PN1P3/PBP2KPr/4RQR1 b - - 4 20
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1379
Best move: g3#