Queen's Gambit Declined - Tarrasch defence
1. d4 d5 2. c4 e6 3. Nc3 c5 4. cxd5 exd5 5. Nf3
White pushes the queen's pawn to d4. Black pushes the queen's pawn to d5. White advances the c-pawn to c4.
Black plays the king's pawn to e6. White develops the knight to c3. Black pushes the c-pawn to c5.
White captures on d5 with the c-pawn. Black captures on d5 with the king's pawn. White moves the knight to f3.