On the Brain Trust discord (a discord community based around the Brain Trust podcast and its creators), there was a conversation that occurred about FKR games (Free Kriegsspiel Revolution), and the amount of freedom to create surrounding games where the rules are not wholly defined at the games outset.
This lead me to be inspired and write my own incredibly basic base set of rules to be used for FKR games but that was also inspired by other games that I like (Barons of Braunstein) and games that I play (Red Markets & Dungeon World).
Anyways, here is the PDF of the two short digest pages of rules. Feel free to use them and modify them for your own games and products.
(PDF: http://thomas-novosel.com/wp-content/uploads/2021/07/SomeShortRulesV1.pdf)