Petrov's Defense: Modern Attack, Symmetrical Variation

The Petrov's Defense: Modern Attack, Symmetrical Variation is a chess opening classified under ECO code C43 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 e5 2. Nf3 Nf6 3. d4 d5. The resulting position leaves white to move.