French Defense, Winawer Variation

The Winawer arises after 1.e4 e6 2.d4 d5 3.Nc3 Bb4. In algebraic notation, Bb4 moves Black's bishop from f8 to b4. The bishop pins the c3-knight: if the knight moves, the diagonal toward White's king on e1 is opened.

The pin increases pressure on e4 because the c3-knight is one of that pawn's defenders. White often advances 4.e5, and Black answers with ...c5 to attack d4. In many lines, a3 forces the bishop to decide, and Black plays Bxc3+, exchanging the bishop for the knight.

After bxc3, White may have doubled c-pawns, meaning two same-colored pawns on one file. In return, White keeps the bishop pair, both bishops, along with central space and attacking chances. Black tries to attack c3 and d4 and open queenside lines. Because Black gave up the bishop that traveled on dark squares, Black must also watch those squares around the king. White’s damaged structure and active resources form one balance.

The pin leads to a tradeoff between structure and bishop pair

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StartNc3Bb4e5c5a3Bxc3+bxc3

3.Nc3 develops the knight and adds a defender to the e4-pawn.

3.Nc3 allows the reply that defines the Winawer

The knight develops actively but becomes aligned with the king along the b4→e1 diagonal.

1. 3.Nc3 develops the knight and adds a defender to the e4-pawn.
2. 3.Nd2 keeps the knight out of the ...Bb4 diagonal and leads to the Tarrasch.
3. 3.e5 closes the center before developing the knight and enters the Advance Variation.

The Classical Variation answers 3.Nc3 with ...Nf6 and keeps the bishop. The Winawer chooses ...Bb4 and accepts an unbalanced position early, with different strengths for each side, within the French Defense.