20-7. Playing from Wrong Place
For a ball played from outside the teeing ground or from a wrong teeing ground — see Rule 11-4 and -5.
a. Match Play
If a player plays a stroke with a ball which has been dropped or placed in a wrong place, he shall lose the hole.
b. Stroke Play
If a competitor plays a stroke with his ball in play (i) which has been dropped or placed in a wrong place or (ii) which has been moved and not replaced in a case where the Rules require replacement, he shall, provided a serious breach has not occurred, incur the penalty prescribed by the applicable Rule and play out the hole with the ball.
If, after playing from a wrong place, a competitor becomes aware of that fact and believes that a serious breach may be involved, he may, provided he has not played a stroke from the next teeing ground or, in the case of the last hole of the round, left the putting green, declare that he will play out the hole with a second ball dropped or placed in accordance with the Rules. The competitor shall report the facts to the Committee before returning his score card; if he fails to do so, he shall be disqualified. The Committee shall determine whether a serious breach of the Rule occurred. If so, the score with the second ball shall count and the competitor shall add two penalty strokes to his score with that ball.
If a serious breach has occurred and the competitor has failed to correct it as prescribed above, he shall be disqualified.
Note: If a competitor plays a second ball, penalty strokes incurred solely by playing the ball ruled not to count and strokes subsequently taken with that ball shall be disregarded.