Thanks, I thought that might be the case, could not quite work the pattern out.It's a really thick pile carpet (i thought too nice a quality for a play room... but i got out voted), so those lines are hover marks so carpet fibers going in different directions. It's so thick we can't close the door and need to plane it...
May I make a little suggestion to think about as opposed to wrecking the door for future needs?
Just change the hinges for some of these type and no messing with wood cutting and door bottom repaint?
Rising butt hinges (rise & fall hinges) in zinc, brass or stainless steel. They allow doors to open & raise up to clear carpets. From ONLY £3.29!