Queen's Gambit Declined Slav - Winawer counter-gambit
1. d4 d5 2. c4 c6 3. Nc3 e5
White plays the queen's pawn to d4. Black moves the queen's pawn to d5. White moves the c-pawn to c4.
Black plays the c-pawn to c6. White develops the knight to c3. Black moves the king's pawn to e5.