French Defense: Rubinstein Variation, Fort Knox Variation

The French Defense: Rubinstein Variation, Fort Knox Variation is a chess opening classified under ECO code C10 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. Nc3 dxe4 4. Nxe4 Bd7 5. Nf3 Bc6. The resulting position leaves white to move.