Kimura (Gyaku ude-garami) The kimura lock (Reverse Ude Garami), applied on Hélio Gracie by Masahiko Kimura. The arm is twisted unusually far because Gracie refused to submit.
Kimura (Brazilian Jiu-Jitsu), chicken wing/double wristlock (wrestling), or reverse keylock are terms used to specify a medial keylock known in judo as gyaku ude-garami (reverse arm entanglement) or simply as ude-garami.
The application is similar to the americana, except that it is
reversed. It needs some space behind the opponent to be effective, and
can be applied from the side control or guard. Contrary to the
americana, the opponent's wrist is grabbed with the hand on the same
side, and the opposite arm is put behind the opponent's arm, again
grabbing the attacker's wrist and forming a figure-four.
By controlling the opponent's body and cranking the arm away from the
attacker, pressure is put on the shoulder joint, and depending on the
angle, also the elbow joint (in some variations the opponent's arm is
brought behind their back, resulting in a finishing position resembling
that of the hammerlock outlined below). The kimura was named after the judoka Masahiko Kimura, who used it to defeat one of the founders of Brazilian Jiu-Jitsu, Hélio Gracie.