What is the theory behind center control? Center control is an important aspect of playing chess, most openings are built around controlling the center, but why? Is center control really that important for winning a game?
The center is the crossroads of the board. Controlling it will give you access to every other part of the board. At the same time, it will drive a wedge in the opponent's position that hampers communication between king and queen side.

Control of the center is usually a decisive advantage in your favor; unless your opponent has heavy compensation (e.g. more than a pawn of material advantage), or a violent attack against your king.