Key ideas
- Black's light-squared bishop often develops to f5 or g4 before ...e6, which solves the problem piece of the Queen's Gambit Declined.
- In the main line Black takes on c4 and holds the pawn for a while, forcing White to spend time to win it back.
Plans for White
Build a strong centre with e3 or e4 and target the slight weaknesses that ...dxc4 leaves on Black's queenside.
Plans for Black
Develop the bishop outside the pawn chain, then complete development with ...e6, ...Nbd7 and castling.

