Ball buried under your own ball

[LBH]

My fellow competitor hit his second on a par 4 on the left side of the green on the edge of a wooded area. He finds his ball and it's playable. He hits it and .... surprise... there was another golf ball buried in the mud underneath his.

His ball makes it half-way to the green from where he was and the second ball moved a few feet.

Any penalty? Play original ball as it lies?

[gbower]

LBH, I hope this will explain your situation.

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15/2 Player’s Stroke at Own Ball Dislodges Concealed Ball

Q. A player plays a stroke with his own ball in the rough and also hits an old abandoned ball which was hidden beneath his ball. Since he struck the hidden ball, did he play a wrong ball?

A. No. The player played a stroke with his own ball, not with the hidden ball. Since he did not play a stroke with the hidden ball, Rule 15-3 is not applicable. The player must play his ball as it lies.