There are a number of compression locks in grappling, which function with tori placing a limb (acting as a fulcrum) in the crook of one of uke's joints, and applying pressure to flex the joint over the limb, simultaneously crushing the muscles/ligaments either side of it and hyper-flexing the joint around it. While
- Achilles Locks (ashi-hishigi, targetting the ankle joint)
- Calf/Thigh Slicers (hiza-hishigi etc, targeting the knee joint)
- and even Neck Locks (kubi-hishigi etc)
are historic judo techniques (if banned in randori/competition for over a century), I have never seen the Biceps Slicer described as an explicit technique in any Kodokan material.1 2
Is a biceps slicer a legal technique (since it is a joint lock targeting the elbow), and if not, was it ever taught in judo?