411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e6/2. d4/2...d5/3. Nc3/3...Bb4/4. e5/4...c5/5. a3/5...Bxc3/6. bxc3/6...Ne7
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Winawer variation C17-C19 Winawer variation
6...Ne7
Black places the knight on its best square.
Although Black's c5 pawn is not defended, White rarely chooses this continuation /7. dxc5/, because then White's tripled pawns on the c-file are very weak and Black has an easy time regaining the pawn with 7...Nd7. White's usual continuation from this position is the aggressive /7. Qg4/, which threatens to capture Black's undefended g7 pawn.
Alternatively White can also play the solid /7. Nf3/ in order to prepare kingside castling, or they can play /7. a4/ with the aim of developing their dark-squared bishop to a3.
Theory table
Main line 7. Qg4 7. Nf3 7. a4 7. dxc5 -
References
French Defence