Chess puzzle (Advantage)
Opening: Queens_Pawn_Game, Queens_Pawn_Game_Accelerated_London_System
Moves: 1. d4 d5 2. Bf4 Nf6 3. e3 g6 4. Nf3 Bg7 5. Be2 O-O 6. h3 Nbd7 7. Nbd2 c6 8. c3
Re8 9. O-O Nf8 10. Re1 N6d7 11. e4 dxe4 12. Nxe4 Ne6 13. Bc4 *
Position (FEN): r1bqr1k1/pp1nppbp/2p1n1p1/8/2BPNB2/2P2N1P/PP3PP1/R2QR1K1 b - - 2 13
Black to move.
Themes: Hanging Piece Opening  
Puzzle rating: 821
Best move: Nxf4