502.6. Players must acknowledge changes to public information that result from their cards and effects as those effects would have an observable impact on the game. see 506.3.d. for examples of observable impact.
502.7. Players must answer honestly any questions regarding public information.
502.8. Players must not represent public or derived information incorrectly.
502.9. Players must point out discrepancies between announced and recorded public information.
502.10. Judges are encouraged to help players determine public information, but not derived information.