No player can register for a tournament if his rating exceeds the limit. However, if their rating changes before the tournament starts, they remain registered. The tournament director can remove them as he sees fit.
As for the rating changes, please learn about the Glicko system, paying special attention to rating deviations.
Tournament rating limits are a pathetic joke , players can register while 100 to 200 points above the limit, no questions asked .one unrated player increased 238 points after 1 tournament win ? after 2nd game win , rating increased by 87 rating points ? two t/directors have advised participants not to play a move against opponents way above the rating limit/ and would remove them. paying for diamond membership i might just as well play standard. Is Murdock the chairman of this chess online club?