Mosconi has the official high run on a 5 x 10 with 353 balls...he also unofficially ran 365 on a 5 x 10.
What made the one official was there a ref or a constant viewer or was it in a tournament. His big run was an exhibition and I have no idea if the big run was shot counting all ball fouls there is even dispute on whether he quit or missed at the end yet it is still considered official.
Anyway what made one run more official than the other?