Queen's Gambit Declined Slav defence - Alekhine variation
1. d4 d5 2. c4 c6 3. Nc3 dxc4 4. e4
White advances the queen's pawn to d4. Black pushes the queen's pawn to d5. White advances the c-pawn to c4.
Black advances the c-pawn to c6. White develops the knight to c3. Black captures on c4 with the queen's pawn.
White plays the king's pawn to e4.