Chess puzzle (Advantage)
Opening: Scotch_Game, Scotch_Game_Scotch_Gambit
Moves: 1. e4 e5 2. Nf3 Nc6 3. d4 exd4 4. Bc4 Nf6 5. e5 d5 6. exd6 Bxd6 7. Nxd4 *
Position (FEN): r1bqk2r/ppp2ppp/2nb1n2/8/2BN4/8/PPP2PPP/RNBQK2R b KQkq - 0 7
Black to move.
Themes:  Opening  
Puzzle rating: 1634
Best move: Nxd4