Chess puzzle (Checkmate)
Opening: Slav_Defense, Slav_Defense_Czech_Variation
Moves: 1. d4 d5 2. Nf3 Nf6 3. c4 c6 4. Nc3 dxc4 5. a4 Bf5 6. Ne5 Nbd7 7. Nxc4 Qc7 8.
g3 e5 9. dxe5 Nxe5 10. Bf4 Nfg4 11. h3 Qe7 12. hxg4 *
Position (FEN): r3kb1r/pp2qppp/2p5/4nb2/P1N2BP1/2N3P1/1P2PP2/R2QKB1R b KQkq - 0 12
Black to move.
Themes: Pin Middlegame Mate in 1 
Puzzle rating: 1509
Best move: Nf3#