Queen's Indian - 4.g3 Bb7

White pushes the queen's pawn to d4. Black develops the knight to f6. White moves the c-pawn to c4.

Black moves the king's pawn to e6. White develops the knight to f3. Black pushes the b-pawn to b6.

White moves the g-pawn to g3. Black develops the light-squared bishop to b7.