Chess puzzle (Crushing)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Stonewall_Attack
Moves: 1. d4 d5 2. e3 Nf6 3. Bd3 c5 4. c3 Nc6 5. f4 b6 6. Nd2 a5 7. Ngf3 Ba6 8. Bc2 e6
9. Kf2 *
Position (FEN): r2qkb1r/5ppp/bpn1pn2/p1pp4/3P1P2/2P1PN2/PPBN1KPP/R1BQ3R b kq - 1 9
Black to move.
Themes:  Opening  
Puzzle rating: 1543
Best move: Ng4+