Chess puzzle (Checkmate)
Opening: Slav_Defense, Slav_Defense_Other_variations
Moves: 1. d4 d5 2. c4 c6 3. Nc3 dxc4 4. e3 b5 5. a4 b4 6. Ne4 a5 7. Bxc4 Bf5 8. Qf3 e6
9. Nc5 Bxc5 10. dxc5 Nf6 11. h3 Bc2 12. Ne2 *
Position (FEN): rn1qk2r/5ppp/2p1pn2/p1P5/PpB5/4PQ1P/1Pb1NPP1/R1B1K2R b KQkq - 2 12
Black to move.
Themes:  Middlegame Mate in 1 
Puzzle rating: 670
Best move: Qd1#