[Matthew F]

I still don't see how this move deceives the runner - anytime that pivot foot moves, it's back to the base. Heck, it's more deceptive to have the pitcher, while coming set, stepping and then snapping a throw towards first than that slow and exaggerated disengagement of the rubber.

That being said, I can accept this rule interpretation. I really wish Evans would have given some guidelines with this interp. For the sake of enforcement, if the pivot foot comes up to the other leg's knee, I'll call it (taking into consideration unusual mound conditions).