After its use to success by Yarden Gerbi in 2014, the IJF clarified that the "Gerbi choke" (suso-jime1) is illegal in judo:
Shime-waza - forbidden
Shime-waza is not allowed with either your own or your opponents belt or bottom of the jacket, or using only the fingers.
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Is the Gerbi choke legal if you use your opponent's jacket?
I had assumed not, given the wording of the rules, but my coach demonstrated it recently and said it was legal and he had personally used it/seen it used multiple times in competition.
Is there some subtlety between applying the choke with your wrist/the skirt itself (similar to the justification for the baseball choke being legal), or between using the 'bottom' of the skirt or a portion higher up while just gripping the bottom?
1. Fighting Judo, Katsuhiko Kashiwazaki (1985) (47. Suso-jime (裾絞 "apron choke"))