Philidor Defense: Nimzowitsch Variation, Sokolsky Variation

The Philidor Defense: Nimzowitsch Variation, Sokolsky Variation is a chess opening classified under ECO code C41 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 e5 2. Nf3 d6 3. d4 Nf6 4. dxe5 Nxe4 5. Nbd2. The resulting position leaves black to move.