Is he penalized?

Yes. Tony is penalized one stroke and he is required to replace the ball (Rule 18-2).

The penalty would also apply to Tony if his caddie or partner in a team match causes the ball to move. If anyone else moves the ball while searching for it, there is no penalty. In match play, a player is not penalized for moving an opponent's ball during a search, nor is there a penalty in stroke play for moving a fellow competitor's ball. Therefore, if anyone is to use a club or foot to root around in deep rough for a lost ball, it should be an opponent or fellow competitor. A few things to note:

• Other than during a search, a player is penalized one stroke for moving or touching an opponent's ball; there is never a penalty for moving a fellow competitor's ball in stroke play.

• A player is not penalized for accidentally touching his ball if the ball does not move (sinking into the grass counts as movement).

• There are some exceptions where a player is not penalized for accidentally causing his ball to move, mostly to do with lifting, replacing, measuring, and removing a movable obstruction.

Now What If?

Tony's ball is so deeply buried in a bunker that it cannot be seen. He probes for it with his foot and moves the ball.

Is he penalized?

No. When the ball is in a hazard (bunker or water hazard), there is no penalty for accidentally moving it during a search. The ball must be replaced and the lie restored, with only enough sand removed so that part of the ball is visible. There is also no penalty for moving a ball while searching for it in casual water or ground under repair.