French Defense: Tarrasch Variation, Guimard Defense, Thunderbunny Variation

The French Defense: Tarrasch Variation, Guimard Defense, Thunderbunny Variation is a chess opening classified under ECO code C03 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 e6 2. d4 d5 3. Nd2 Nc6 4. c3 dxe4 5. Nxe4 e5. The resulting position leaves white to move.