Chess puzzle (Advantage)
Opening: Kings_Pawn_Game, Kings_Pawn_Game_Napoleon_Attack
Moves: 1. e4 e5 2. Qf3 Nf6 3. Bc4 d6 4. Qb3 Qe7 5. d3 Nc6 6. Bd2 Nd4 7. Qc3 c6 8. Nf3
b5 9. Nxd4 *
Position (FEN): r1b1kb1r/p3qppp/2pp1n2/1p2p3/2BNP3/2QP4/PPPB1PPP/RN2K2R b KQkq - 0 9
Black to move.
Themes:  Opening  
Puzzle rating: 1143
Best move: exd4