The player may deem his ball unplayable at any place on the
course except when the ball is in a water hazard. The player is
the sole judge as to whether his ball is unplayable.
If the player deems his ball to be unplayable, he must, under
penalty of one stroke:
a. Play a ball as nearly as possible at the spot from which the
original ball was last played (see Rule 20-5); or
b. Drop a ball behind the point where the ball lay, keeping that
point directly between the hole and the spot on which the ball
is dropped, with no limit to how far behind that point the ball
may be dropped; or
c. Drop a ball within two club-lengths of the spot where the
ball lay, but not nearer the hole.
If the unplayable ball is in a bunker, the player may proceed
under Clause a, b or c. If he elects to proceed under Clause b
or c, a ball must be dropped in the bunker.
The ball may be lifted and cleaned when proceeding under
this Rule.