The Most Powerful Armlock in Judo: Jujigatame - The Cross Armlock

Another by Sensei Ohlenkamp. About him:

Neil Ohlenkamp is a martial arts teacher and founder of the internationally acclaimed judo Website: www.judoinfo.com. He holds a seventh degree black belt in Judo and a sixth degree black belt in jujitsu and has over 31 years of training and experience in various martial arts as a competitor, instructor, team coach, and tournament official. He is a certified United States Judo Association instructor, referee, master rank examiner, and master coach (the highest level of certification), and he was awarded United States Judo Coach of
the Year for 1999. Ohlenkamp is an advisor to FightingArts.com and has been a regular contributor of articles on judo and related topics.