22. If a ball in motion be stopped or deflected by any agency outside the match, or by the forecaddie, the ball must be played from where it lies, and the occurrence submitted to as a "rub of the green." If a ball lodge in anything moving, a ball shall be dropped as near as possible to the place where the object was when the ball lodged in it, without penalty. If a ball at rest be displaced by any agency outside the match, excepting wind, the player shall drop a ball as near as possible to the place where it lay, without penalty. On the putting-green the ball shall be replaced by hand, without penalty.
23. If the player's ball strike, or be moved by an opponent or an opponent's caddie or clubs, the opponent shall lose the hole.
24. When a player has holed out and his opponent has been left with a putt for the half, nothing that the player can do shall deprive him of the half which he has already gained.
25. If a player's ball strike, or be stopped by himself or his partner, or either of their caddies or clubs, his side shall lose the hole.
26. If the player, when not intending to make a stroke, or his partner, or either of their caddies, move his or their ball, or by touching anything cause it to move when it is in play, the penalty shall be one stroke. If a ball in play move, after the player has grounded his club in the act of addressing it, or, when in a hazard, if he has taken up his stand to play it, he shall be deemed to have caused it to move, and the movement shall be counted as his stroke.
27. Except from the tee a player shall not play while his ball is moving, under penalty of the loss of the hole. If the ball only begin to move while the player is making his upward or downward swing, he shall incur no penalty for playing while it is moving, but is not exempted from the penalty stroke which he may have incurred under Rules 9, 17, or 26, and in a foursome a stroke lost under Rule 26 shall not, in these circumstances, be counted as the stroke of the player so as to render him liable for having played when his partner should have done so.
28. If the player when making a stroke strike the ball twice, the penalty shall be one stroke, and he shall incur no further penalty by reason of his having played while his ball was moving.
29. If a player play the opponent's ball, his side shall lose the hole, unless (1) the opponent then play the player's ball, whereby the penalty is cancelled, and the hole must be played out with the balls thus exchanged, or (2) the mistake occur through wrong information given by the opponent or his caddie, in which case there shall be no penalty, but the mistake, if discovered before the opponent has played, must be rectified by placing a ball as near as possible to the place where the opponent's ball lay.
If a player play a stroke with the ball of a party not engaged in the match, and the mistake be discovered and intimated to his opponent before his opponent has played his next stroke, there shall be no penalty; but if the mistake be not discovered and so intimated until after the opponent has played his next stroke, the player's side shall lose the hole.
30. If a ball be lost, except as otherwise provided for in the Rules, the player's side shall lose the hole; but if both balls be lost, the hole shall be considered halved.