Page type: Glossary / definition
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Meaning
A moved ball leaves its original spot and comes to rest elsewhere, with movement visible to the naked eye. Once movement is known or virtually certain, the Rules distinguish causes such as natural forces, a player, an opponent or an outside influence.
How it matters in match play
In match play, the cause matters. If Alex moves their own ball, Rule 9.4 normally adds one penalty stroke and requires replacement. If Ben, the opponent, moves Alex's ball, Rule 9.5 normally gives Ben one penalty stroke and Alex replaces the ball. Accidental movement during a search, on the putting green, or while applying a Rule can be an exception; a concession can also permit lifting without penalty.
Table
| Quick reference | Detail |
|---|---|
| Term | Moved Ball |
| Category | rules |
| Applicable rule | Rules of Golf Rule 9, especially Rules 9.2, 9.4 and 9.5 |
| Related concepts | Ball at Rest, Ball in Motion, Accidental Movement, Replacing the Ball, Concession |
Worked example
On the seventh hole, Alex accidentally kicks their ball 30 centimetres while addressing it; Alex adds one penalty stroke and replaces the ball, while Ben's match lead is otherwise unchanged.
Rule reference: Rules of Golf Rule 9, especially Rules 9.2, 9.4 and 9.5
Sources: www.randa.org , www.randa.org , www.usga.org
Common questions
Does a ball have to move far before it counts as moved?
It must leave its original spot and come to rest on another spot, with movement visible to the naked eye. If it is only possible that the ball moved, and that is not known or virtually certain, it is treated as not having moved.
What happens when an opponent moves my ball in match play?
Under Rule 9.5, the opponent normally gets one penalty stroke and your ball must be replaced on its original spot. Exceptions include moving it while conceding a stroke, hole or match, or moving it at your request so you can apply a Rule.
Is there always a penalty when I accidentally move my ball?
No. Rule 9.4 has exceptions, including accidental movement before the ball is found, accidental movement on the putting green, and accidental movement while taking reasonable actions to apply a Rule. Outside those exceptions, causing your ball to move normally costs one penalty stroke.