This Brazilian Jiu-jitsu Technique is Written and Demonstrated by Gene Simco from NYMAG (New York Martial Arts Gym). Gene is available for private lessons by contacting INFO@jiu-jitsu.net
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In this situation, I am in the side control (top) position. To begin my attack, I will 'open' my opponent's gi collar, pushing it to the floor on the opposite side of his body. I have made some additional space (more space than if I were performing the choke in a 'real' situation) so that you can see the details of the movement.
transfer my opponent's left collar to my left hand, which is under my opponent's neck. At this point, you must be sure to maintain control of your opponent so he does not escape to his knees or regain his guard by replacing his right leg under your body.
To ensure that my opponent does not escape as I continue this movement, I will grab his pants (at his right leg) as shown here. Note how I continue to control my opponent's collar under his neck.
While continuing to control my opponent's collar and leg, I place my left foot at the left side of my opponent's head as shown.
To finish the choke, I will twist my body to the right, sliding my shin under my opponent's chin. I will drive my left knee to the floor as I lift up with my left hand - still controlling my opponent's right leg with my right hand.
At his point, my opponent may try to remove my leg from his face as shown …
I place my left arm under my opponent's right arm as show, with my left hand cupping my opponent's tricep. It is important to 'lift' his arm up to your body.
squat down as shown, almost sitting on my opponent's face. I am still holding his right leg for control. I grab my own gi collar with my left hand in order to secure my opponent's arm and set up the straight armlock.
To finish, I sit down, keeping my left leg over my opponent's face and my opponent's elbow between my legs by my stomach. My knees are squeezed together around my opponent's arm to keep pressure off my groin and 'vice' the arm. I keep his thumb pointed up by squeezing his wrist with my left bicep and twisting my body to the right or left - depending on what way he resists. I continue to hold the leg so my opponent does not roll away and escape. To finish, I simply left my hips up as I perform all the previously described elements. This armlock is called Juji-gatame in Japanese and Chave de Braco in Brazilian Portuguese.