Queen's Gambit Declined - Albin counter-gambit - 5.g3
1. d4 d5 2. c4 e5 3. dxe5 d4 4. Nf3 Nc6 5. g3
White moves the queen's pawn to d4. Black pushes the queen's pawn to d5. White pushes the c-pawn to c4.
Black plays the king's pawn to e5. White captures on e5 with the queen's pawn. Black pushes the queen's pawn to d4.
White develops the knight to f3. Black develops the knight to c6. White moves the g-pawn to g3.