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Step 1
Wait until your opponent presses both hands against your chest. It doesn't matter whether you are on the top or the bottom. You need his arms in order to perform the jiu jitsu under arm choke.
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Step 2
Grab one of your opponent's gi lapels. Make this a same-side grab over the top of his arm. If you are using your left hand then clutch your opponent's right lapel. Pull it toward you. Your opponent will probably resist. This will open up his gi.
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Step 3
Loop your other arm around the outside of your opponent's other arm. Slide it across his chest and grab the opposite-side gi lapel that you just opened up. Grip it as close to your opponent's neck as you can and pull it across your body. This traps his arm.
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Step 4
Let go with the hand that first grabbed the gi. Continue to hold the gi tight with the other hand. Reach your just-released hand across your opponent's body and grab his gi at the side of his neck. Do this with a thumb-down overhand grab. Your arms are now crossed.
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Step 5
Press the knife edge of your thumb-down hand against your opponent's carotid artery in his neck. This is in the gap next to his Adam's apple.
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Step 6
Crank the choke. Pull both arms outward as you draw your opponent toward you. Raising your head makes this easier. This motion immediately cuts off your opponent's blood supply to his brain. He will either tap out or pass out within a few seconds.






