|"Of Slain Kings on Checkered Fields"|
|Airdate:||May 10, 2003|
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"The Currency of Doubt"
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"Foes Don't Forgive"
Of Slain Kings on Checkered Fields was the eighteenth episode of Fillmore! to be produced and the twelfth to air. It was originally broadcast on May 10, 2003.
When Checkmatey, X Middle School's number one chess player, is being threathened Fillmore and Ingrid are assigned to take care of him and discover who is out to get Checkmatey. Could it be rival finalist, Nelson, or is Checkmatey hiding something?