Queen's Gambit Declined - Semi-Tarrasch
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5 5. cxd5
White advances the queen's pawn to d4. Black plays the queen's pawn to d5. White moves the c-pawn to c4.
Black plays the king's pawn to e6. White develops the knight to c3. Black develops the knight to f6.
White develops the dark-squared bishop to g5. Black plays the c-pawn to c5. White captures on d5 with the c-pawn.