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Rub of the Green
A “rub of the green’’ occurs when a ball in motion is accidentally deflected or stopped by any outside agency (see Rule 19-1).
Outside Agency
An “outside agency’’ is any agency not part of the match or, in stroke play, not part of the competitor’s side, and includes a referee, a marker, an observer and a forecaddie. Neither wind nor water is an outside agency.
Obstructions
An “obstruction’’ is anything artificial, including the artificial surfaces and sides of roads and paths and manufactured ice, except:
a. Objects defining out of bounds, such as walls, fences, stakes and railings;
b. Any part of an immovable artificial object that is out of bounds; and
c. Any construction declared by the Committee to be an integral part of the course.
An obstruction is a movable obstruction if it may be moved without unreasonable effort, without unduly delaying play and without causing damage. Otherwise it is an immovable obstruction.