I have a reverse grip with the right hand (upper hand) gripping an extended putter against the length of my left forearm. My whole left arm, including above the elbow is well away from my body giving a free pendulum motion.
My right elbow is, for shorter putt,s tucked into my torso, for longer putts I allow more freedom and take it off my body.
I don’t have yips but developed this style back in the mid 80’s and love it.
Will I be illegal in 2016?
I don’t think so