The situation: a ball moves before the putter reaches it
On 27 October 2026, GOLF.com's Rules Guy addressed a reader's hypothetical case: while putting downhill and downwind, the ball began rolling after the player's backswing had already started. The player went ahead and completed the stroke. Is there a penalty because the ball moved closer to the hole? This is an explanation of established Rules of Golf, not a new rule change.
Timing determines the ruling
Rule 10.1d generally prohibits making a stroke at a moving ball. Its first exception, however, applies when a ball starts moving only after the player has begun the backswing for the stroke. In that case, Rule 9.1b controls. If the player completes the stroke, the ball is not replaced, regardless of the original cause of movement; play continues from where the ball comes to rest after that stroke.
This exception does not give players permission to deliberately wait for wind to improve the lie. Nor does it apply if the ball was already rolling before the backswing began.
Who caused the movement?
Under Rule 9.2b, whether the player caused a stationary ball to move is judged using the “known or virtually certain” standard. In the reader's account, there was no evidence that the player had caused the movement. The player had not grounded the putter beside the ball, although grounding a club by itself is not proof of causation. Wind was therefore treated as the cause, so no penalty applied.
Even if a player accidentally moves their own ball on the putting green, Rule 9.4b has a specific no-penalty exception. The correct procedure still depends on precisely when the movement occurred and whether the stroke was completed.
What if the ball moves before the backswing?
A ball previously lifted and replaced on the putting green must be replaced again if wind moves it before the backswing, under Rule 13.1d. If a ball has not been lifted and replaced, natural forces moving it before the stroke generally mean playing from its new location under Rule 9.3.
These distinctions come from the current R&A Rule 9, Rule 10 and Rule 13. The October 2026 column illustrates existing rules rather than announcing an amendment.
