French Defense: Winawer Variation, Winckelmann-Reimer Gambit

The French Defense: Winawer Variation, Winckelmann-Reimer Gambit is a chess opening classified under ECO code C15 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 6 moves: 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. a3 Bxc3+ 5. bxc3 dxe4 6. f3. The resulting position leaves black to move.