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313. At any given time, up to one player has Focus.

313.1. Focus is the permission to take appropriately timed Discretionary Actions when the turn is in a Showdown Open State. See rule 307. States of the Turn for more information.
313.2. A player who gains Focus also gains Priority.
313.3. A player who passes Priority retains Focus.
313.4. A player may not make discretionary actions with Focus unless they also possess Priority.
313.5. If the turn is in a Neutral State , no player has Focus.