French Defense: Winawer Variation, Petrosian Variation

The French Defense: Winawer Variation, Petrosian Variation is a chess opening classified under ECO code C16 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 4 moves: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. e5 Qd7. The resulting position leaves white to move.