411 REFERENCE · Wikibooks
Chess Opening Theory/1. d4/1...d5/2. c4/2...dxc4/3. Nf3/3...Nf6/4. e3/4...e6
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Queen's Gambit Accepted D25-D29
4...e6
This move prepares to release the f8-bishop into action. The light-squared bishop is supposed to go to b7, but sometimes has to settle for the passive d7-square.
White should follow up on their previous moves and capture the pawn on c4 with /5. Bxc4/.
Theory table
5. Bxc4 c5 6. O-O a6
See also
Queen's Gambit Accepted