This week, Professor Madama has concentrated his instruction on variations of the kimura bent armlock, set-ups, and escapes.
This week marks the 63rd anniversary of the famous jiu-jitsu match in which Helio Gracie was defeated by Masahiko Kimura. Kimura used a bent armlock (ude garami) to break Helio's arm. Since that day, that specific bent armlock has been called the "kimura."
Read about the history of the kimura at Fightland.