Catcher moves up into the batter's box

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The catcher's box is 10ft in length from the rear outside corners of the batter's box. According to POE -8, the catcher must remain in the box till pitch is released, however, if the batter moves to the front of the box the cather may move up without penalty. However, the batter still has the right to the enotre batter's box, and can move back at anytime. It's up to the catcher to avoid obstructon.