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Ball (or ball-marker) moved - During backswing or stroke
If your ball at rest begins moving after you have begun the stroke or the backswing for a stroke and you go on to make the stroke:
- The ball must not be replaced, no matter what caused it to move.
- Instead, you must play the ball from where it comes to rest after the stroke.
- On the putting green, there is no penalty unless you deliberately caused the ball to move before the stroke (see Rule 9.4b).