Queen's Gambit Accepted - Bogolyubov variation
1. d4 d5 2. c4 dxc4 3. Nf3 Nf6 4. Nc3 a6 5. e4
White pushes the queen's pawn to d4. Black pushes the queen's pawn to d5. White advances the c-pawn to c4.
Black captures on c4 with the queen's pawn. White develops the knight to f3. Black develops the knight to f6.
White moves the knight to c3. Black pushes the a-pawn to a6. White moves the king's pawn to e4.