Chess puzzle (Crushing)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. Nf3 c5 4. e3 Nc6 5. c3 Qb6 6. Qc2 Bf5 7. Qc1 e6 8. Nbd2
Rc8 9. dxc5 Bxc5 10. Nb3 Be7 11. Qd2 Ne4 12. Qd4 *
Position (FEN): 2r1k2r/pp2bppp/1qn1p3/3p1b2/3QnB2/1NP1PN2/PP3PPP/R3KB1R b KQk - 5 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1218
Best move: Nxd4