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I see that some tournaments with prizes are limited to low rated players. Given that travel requires planning, I expect entry to the tournament is processed some time before the 1st day of the tournament.
So what happens if a person does very well in another tournament shortly before and hence get an increased rating?
The rules are specific to each tournament. For example 2021 U.S. Class Chess Championships specified "July 2021 Rating Supplement used for pairings and Prizes".
