French Defense: Diemer-Duhm Gambit Accepted

The French Defense: Diemer-Duhm Gambit Accepted is a chess opening classified under ECO code C00 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 3 moves: 1. e4 e6 2. d4 d5 3. c4 dxe4. The resulting position leaves white to move.