Queen's Gambit Declined - 4.Bg5 Be7 - 5.e3 O-O

White plays the queen's pawn to d4. Black advances the queen's pawn to d5. White plays the c-pawn to c4.

Black advances 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 develops the dark-squared bishop to e7. White plays the king's pawn to e3.

Black castles kingside.