Queen's Gambit Declined - exchange - positional line
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. cxd5 exd5 5. Bg5
White pushes the queen's pawn to d4. Black plays the queen's pawn to d5. White plays the c-pawn to c4.
Black pushes the king's pawn to e6. White develops the knight to c3. Black develops the knight to f6.
White captures on d5 with the c-pawn. Black captures on d5 with the king's pawn. White develops the dark-squared bishop to g5.