Four Knights Game: Scotch Variation, Krause Gambit, Leonhardt Defense

The Four Knights Game: Scotch Variation, Krause Gambit, Leonhardt Defense is a chess opening classified under ECO code C47 in the Open Games & French Defense family, beginning with 1.e4 e5 or 1.e4 e6, including the Italian Game, Ruy Lopez, and French Defense. It is reached after 5 moves: 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 Bb4 5. Nxe5 Qe7. The resulting position leaves white to move.