But the first requirement for these categories is "can be played with a standard chess set", which isn't true?
I have now changed this. Since most of the Usual-* categories could be useful for other games if not for the Usual Equipment requirement, and since we only really need one category for Usual Equipment, I added a new UsualEquipment category, then I added it to any Item with a Usual-* category that was a 2D game on an 8x8 board but was not in the Small or Large categories. After doing that, I created new versions of the Usual-* categories with the Diff- prefix instead of Usual-, changed them all in the database, and updated some scripts that modify categories. I think I need to modify queryinc.php next.
I have now changed this. Since most of the Usual-
*categories could be useful for other games if not for the Usual Equipment requirement, and since we only really need one category for Usual Equipment, I added a new UsualEquipment category, then I added it to any Item with a Usual-*category that was a 2D game on an 8x8 board but was not in the Small or Large categories. After doing that, I created new versions of the Usual-*categories with the Diff- prefix instead of Usual-, changed them all in the database, and updated some scripts that modify categories. I think I need to modify queryinc.php next.