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The regulations state that applications from participants with a 1599 rating will be considered on an individual basis. (meaning that according to this criterion, the application is accepted by a vote among the 5 tournament organizers and judges)
The main rule is that the registration date must be before June 1, 2015, and there must be at least 50 rated games.
For example, Warden has a low rating, but he finishes the tournaments, and meets the main criterion, so I am "for" his participation.