Vienna Gambit, with Max Lange Defense: Cunningham Defense

The Vienna Gambit, with Max Lange Defense: Cunningham Defense is a chess opening classified under ECO code C25 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. Nc3 Nc6 3. f4 exf4 4. Nf3 Be7. The resulting position leaves white to move.