Queen's Gambit Declined Slav - exchange variation - 6.Bf4 Bf5

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

Black pushes the c-pawn to c6. White develops the knight to f3. Black develops the knight to f6.

White captures on d5 with the c-pawn. Black captures on d5 with the c-pawn. White transfers the knight to c3.

Black moves the knight to c6. White develops the dark-squared bishop to f4. Black develops the light-squared bishop to f5.