It is challenging for any level of player, and cue ball control is critical. Be the first to touch every ball on the table in succession with the cue ball. In a turn, a player gets exactly one shot in which to advance as many balls as possible. Players advance by touching their target ball with the cue ball, or when their target ball is pocketed. Even within a shot, balls must be advanced in order.
Advancement occurs at the time of contact, or at the moment the target ball is pocketed.
Cue ball collisions with non-target balls do not effect advancement. All pocketed balls remain pocketed. A player automatically advances past any balls that are not on the table when they are reached. Shots are not called. The other player then chooses whether to begin with the 1 or with the 15 and breaks.