Rule 13. Ball Played as It Lies
All defined terms are in italics and are listed alphabetically in the Definitions section.
13-1. GeneralThe ball must be played as it lies, except as otherwise provided in the Rules.
(Ball at rest moved - see Rule 18.)
13-2. Improving Lie, Area of Intended Stance or Swing, or Line of PlayA player must not improve or allow to be improved:
+ the position or lie of his ball,
+ the area of his intended stance or swing,
+ his line of play or a reasonable extension of that line beyond the hole, or
+ the area in which he is to drop or place a ball,
by any of the following actions:
+ pressing a club on the ground,
+ moving, bending or breaking anything growing or fixed (including immovable obstructions and objects defining out of bounds),
+ creating or eliminating irregularities of surface,
+ removing or pressing down sand, loose soil, replaced divots or other cut turf placed in position, or
+ removing dew, frost or water.
Rule 18. Ball at Rest Moved
18-2. By Player, Partner, Caddie or Equipment a. General
When a player's ball is in play, if:
(i) the player, his partner or either of their caddies lifts or moves it, touches it purposely (except with a club in the act of addressing it) or causes it to move except as permitted by a Rule, or
(ii) equipment of the player or his partner causes the ball to move, the player incurs a penalty of one stroke.
If the ball is moved, it must be replaced, unless the movement of the ball occurs after the player has begun the stroke or the backward movement of the club for the stroke and the stroke is made.