Chess puzzle (Checkmate)
Moves: 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Qc2 Bb4 5. Nf3 Nc6 6. Bg5 dxc4 7. e3 Qd5 8.
Bxf6 gxf6 9. Be2 Bd7 10. O-O Bxc3 11. bxc3 Na5 12. e4 Qd6 13. e5 Qe7 14. exf6
Qxf6 15. Ne5 O-O-O 16. Rab1 Bc6 17. Nxc6 Nxc6 18. Bxc4 Rhg8 19. Qb3 Rxg2+ 20.
Kxg2 Rg8+ 21. Kh1 *
Position (FEN): 2k3r1/ppp2p1p/2n1pq2/8/2BP4/1QP5/P4P1P/1R3R1K b - - 2 21
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 1010
Best move: Qf3#