Last year it was grade based with an age cut off of May 1. Several teams had to leave the kids who were not age eligible home and that is what should happen when you win only by loading your team with older kids and holdbacks. Last year the rule changed from pure 2020 w a 9/1 cut off to 5/1 to try and accommodate Crabs or at least let them get more of their kids there. They still had to leave a few home but were able to field a team with the date change and adding a few kids from other teams.