London System
1. d4 d5 2. Nf3 Nf6 3. Bf4
White moves the queen's pawn to d4. Black moves the queen's pawn to d5. White develops the knight to f3.
Black develops the knight to f6. White develops the dark-squared bishop to f4.
White moves the queen's pawn to d4. Black moves the queen's pawn to d5. White develops the knight to f3.
Black develops the knight to f6. White develops the dark-squared bishop to f4.