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Provisional ball - Announcing play of provisional ball
Before the stroke is made, you must announce that you are going to play a provisional ball.
It is not enough for you only to say that you are playing another ball or are playing again.
You must use the word “provisional” or otherwise clearly indicate that you are playing the ball provisionally under Rule 18.3.
If you did not announce this (even if you intended to play a provisional ball) and played a ball from where the previous stroke was made, that ball is your ball in play under penalty of stroke and distance.