Backcourt or not

[bob jenkins]

Originally Posted by Kansas Ref

And dare I say here---non-jumping players continually moving around and shuffling prior to the tap

Some (perhaps most) of that movement is legal.

I tried to put together a little chart, but I can't get it to format properly.

As a practical matter, moving off the circle is always allowed.

You can't move on or around or break the plane after the official is ready, but most of the time this movement happens as the official is moving in, and the official will just re-set.

Once the ball is tossed, you can move on or around, but you can't take an occupied space or break the plane. Those two things rarely happen.