The Official Rules of Golf appear on the About.com Golf site courtesy of the USGA, are used with permission, and may not be reprinted without the permission of the USGA.

24-1. Movable Obstruction
A player may take relief without penalty from a movable obstruction as follows:

a. If the ball does not lie in or on the obstruction, the obstruction may be removed. If the ball moves, it must be replaced, and there is no penalty provided that the movement of the ball is directly attributable to the removal of the obstruction. Otherwise, Rule 18-2a applies.

b. If the ball lies in or on the obstruction, the ball may be lifted and the obstruction removed. The ball must through the green or in a hazard be dropped, or on the putting green be placed, as near as possible to the spot directly under the place where the ball lay in or on the obstruction, but not nearer the hole.

The ball may be cleaned when lifted under this Rule.

When a ball is in motion, an obstruction that might influence the movement of the ball, other than link url=http://golf.about.com/cs/rulesofgolf/g/rules_equipment.htm]equipment[/link] of any player or the when attended, removed or held up, must not be moved.

(Exerting influence on ball — see [link url=http://golf.about.com/cs/rulesofgolf/a/rule1.htm]Rule 1-2.)

Note: If a ball to be dropped or placed under this Rule is not immediately recoverable, another ball may be substituted.

24-2. Immovable Obstruction
• a. Interference
Interference by an immovable obstruction occurs when a ball lies in or on the obstruction, or when the obstruction interferes with the player’s stance or the area of his intended swing. If the player’s ball lies on the putting green, interference also occurs if an immovable obstruction on the putting green intervenes on his line of putt. Otherwise, intervention on the line of play is not, of itself, interference under this Rule.

• b. Relief
Except when the ball is in a water hazard or a lateral water hazard, a player may take relief from interference by an immovable obstruction as follows:

  (i) Through the Green: If the ball lies through the green, the player must lift the ball and drop it without penalty within one club-length of and not nearer the hole than the nearest point of relief. The nearest point of relief must not be in a hazard or on a putting green. When the ball is dropped within one club-length of the nearest point of relief, the ball must first strike a part of the course at a spot that avoids interference by the immovable obstruction and is not in a hazard and not on a putting green.
  (ii) In a Bunker: If the ball is in a bunker, the player must lift the ball and drop it either:
    (a) Without penalty, in accordance with Clause (i) above, except that the nearest point of relief must be in the bunker and the ball must be dropped in the bunker; or
    (b) Under penalty of one stroke, outside the bunker keeping the point where the ball lay directly between the hole and the spot on which the ball is dropped, with no limit to how far behind the bunker the ball may be dropped.
  (iii) On the Putting Green: If the ball lies on the putting green, the player must lift the ball and place it without penalty at the nearest point of relief that is not in a hazard. The nearest point of relief may be off the putting green.
  (iv) On the Teeing Ground: If the ball lies on the teeing ground, the player must lift the ball and drop it without penalty in accordance with Clause (i) above.

The ball may be cleaned when lifted under this Rule.

(Ball rolling to a position where there is interference by the condition from which relief was taken — see Rule 20-2c(v).)

Exception: A player may not take relief under this Rule if (a) it is clearly unreasonable for him to make a stroke because of interference by anything other than an immovable obstruction or (b) interference by an immovable obstruction would occur only through use of an unnecessarily abnormal stance, swing or direction of play.

Note 1: If a ball is in a water hazard (including a lateral water hazard), the player may not take relief from interference by an immovable obstruction. The player must play the ball as it lies or proceed under Rule 26-1.

Note 2: If a ball to be dropped or placed under this Rule is not immediately recoverable, another ball may be substituted.

Note 3: The Committee may make a Local Rule stating that the player must determine the nearest point of relief without crossing over, through or under the obstruction.

Continued on Next Page ...