Check Side Meaning in Billiards

Check side is a type of spin used to slow down the cue ball after it hits a rail. It is achieved by hitting the side of the cue ball that is opposite to the direction it is traveling. When the ball strikes the cushion, this spin acts like a brake, narrowing the angle of the bounce. It is the opposite of ‘running side,’ which makes the ball travel faster and wider. For example, a player applies right spin when hitting the left rail to keep the cue ball from rolling too far. This delicate control is vital for keeping the cue ball in a small area for the next shot. It is a fundamental tool for advanced position play.