Chess puzzle (Crushing)
Opening: Zukertort_Opening, Zukertort_Opening_Sicilian_Invitation
Moves: 1. Nf3 c5 2. g3 d6 3. Bg2 Nf6 4. O-O e5 5. d3 d5 6. Nxe5 Bd6 7. Nf3 O-O 8. d4
cxd4 9. Qxd4 Nc6 10. Qd1 Qc7 11. Nd4 Bd7 12. f4 *
Position (FEN): r4rk1/ppqb1ppp/2nb1n2/3p4/3N1P2/6P1/PPP1P1BP/RNBQ1RK1 b - - 0 12
Black to move.
Themes:  Middlegame  
Puzzle rating: 1477
Best move: Nxd4