[RefBob]

Thanks for all the clarifying points. Clearly the three point analogy is not a good idea for thinking about over and back violations - because I now see that it is wrong. Good point about the player at the division line holding the ball with one foot in the back court and one in the front court. As soon as he lifts his backcourt foot he is now in the frontcourt - no need for both feet to actually touch into the front court as for a dribbler.

Thanks again.