English - Caro-Kann defensive system - Bogolyubov variation
1. c4 c6 2. Nf3 d5 3. b3 Bg4
White plays the c-pawn to c4. Black moves the c-pawn to c6. White develops the knight to f3.
Black moves the queen's pawn to d5. White advances the b-pawn to b3. Black develops the light-squared bishop to g4.