Any number of pins hit by a ball found to be ineffective will not count. The pins are reset and the player (after the reason for the ball to be ineffective has been removed) continues his attempt.
A ball is not counted if one of the following circumstances occurs:
– the player plays not on his own lane or out of turn;
– another player, spectator or any moving object interferes with the player;
– one or more pins are missing in the original combination or are displaced;
– the player’s ball comes into contact with any foreign object.