This only works with the gi or at least sleeves, when someone is in your guard and using bicep control, bring your elbow to your ribs trapping their hand in your armpit, lay the hand of you trapping arm on your opposite peck. The motion to make it tight is tricky but your going to raise your trapping arm to bend their wrist upward and inward.
From top side, when someone is framing up, if they place their palm flat on your chest to frame, trap their elbow against their ribs and simply lean your weight on to the trapped wrist. You can also do this if they aren't framing against your chest, just trap the far side elbow against their body and thus the matt and apply pressure with your free hand, bend their wrist back (extension not flexion)
When your opponent has your back with seat belt control, fall to the side of the underhook and trap their elbow against the mat, gooseneck style wrist lock.
Hand fighting inside the guard. Grasp their hand with your opposite hand so that your fingers are curled around their pinky finger side. Press their hand to their chest. With your other hand (same side as their trapped hand) reach through space between their side and elbow up to your trapping hand, you can either use this hand to add more torque or grasp their wrist to prevent them from straightening their arm across their body.
There are a few when someone is clasping their hands to defend an armbar. I have never gotten them to work without mma gloves personally, for the most part, I find I need the arm controlled from the elbow to the wrist to make wrist locks work unless you are completely dry.
Of course the kimura can be done as a wrist lock more than a shoulder lock and the americana can also be done with the back of their hand pressed against the matt to make it a wrist lock but without rotation (deviation) some people are immune.
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