Chess puzzle (Advantage)
Opening: Russian_Game, Russian_Game_Italian_Variation
Moves: 1. e4 e5 2. Nf3 Nf6 3. Bc4 Nxe4 4. Qe2 d5 5. Bb3 Nc6 6. d3 Nd4 *
Position (FEN): r1bqkb1r/ppp2ppp/8/3pp3/3nn3/1B1P1N2/PPP1QPPP/RNB1K2R w KQkq - 1 7
White to move.
Themes:  Opening  
Puzzle rating: 1344
Best move: Nxd4