Interference

[Buck912]

Here's my opinion to your situations. As for #1, our association does not use the double base, so on that one, I'll pass. However on #2..my position is rather simple. The batter does not have to vacate the batter's box to make it easier for the catcher to make a play on a runner stealing a base. (most of the time, it involves 3rd base.) The batters box belongs to the batter. However, she must not make any movment (for example, leaning back or forward) that would prevent the catcher from making the throw. The same thing would apply if the batter does move out of the box, she can't get in the way of or do anything that would hinder the catcher in making the play. Now if there's a play at the plate (like a passed ball and the pitcher is covering home) then the batter must get out of the box or risk an interference call. For #3, I agree with everyone else on that being your judgment as to interference or not.