Bishop's Opening: Boden-Kieseritzky Gambit, Lichtenhein Defense

The Bishop's Opening: Boden-Kieseritzky Gambit, Lichtenhein Defense is a chess opening classified under ECO code C27 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 4 moves: 1. e4 e5 2. Nf3 Nf6 3. Bc4 Nxe4 4. Nc3 d5. The resulting position leaves white to move.