sentences:  A foul and a miss will be called if a player does not hit the ball "on" first (a foul) and is deemed by the to have not made the best possible attempt (a miss).In this case, the opponent has the option to request that all balls on the table be returned to their position before the foul, and require the fouling player to take the shot again.The rule was introduced to prevent players from playing (i.e., deliberately fouling so as to leave the balls in a safe position, reducing the risk of giving a frame-winning chance to the opponent).