sentences:  If the ball on is a colour that is snookered by another colour after a foul, all reds must have been already potted; thus the free ball still has to be a colour ball.Interesting situations could occur if somehow both the free ball and the real ball on are potted.If a colour were the ball on (all reds were potted), and both the free ball and the actual ball on are potted, only the ball on is scored.