From: www.adcombat.com

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Everyone knows that the ADCC strives to be fair giving
everyone an equal field to compete in the greatest and most prestigious
grappling event in the world. That is why the committee developed a different
set of rules that incorporates the best and most efficient moves from various
grappling modalities. Over the years the committee has constantly sought
feedback from athletes, coaches and referees using their input in their review
process to further improve these rules.

From that process the committee recent meetings yielded a rule regarding weight
limits. Starting immediately, athletes will be weight in just before they enter
the mat for competing. This assures that said athletes do not go to extreme
weight cutting and then “tank” (gaining weight) before their matches
thus assuring the athletes will be competing closest to the weight limit of
their category. This process will be done on both days! Additionally referees
will be spot checking during the competition for anyone that is
“tanking”, any athlete can be spot checked at any time and required
to re-weight, if they are over 2KG above their weight class limit they will be
immediately disqualified.

The object of this rule change is to discourage extreme and dangerous weight
cutting and to insure that all athletes compete in “their natural weight
class” assuring the fairest competition conditions for all.