I'm big fan of alternative history discussions, you know, starting from a "what if" and create, along the posts, a common and vivid, yet strange world.
So i've been thinking for a long time in a set of rules to help people who are not used too, or bring more tools for structuring.
Basically my idea is about making the implicit explicit : building on existing practices on the forum
For exemple, the "Butterly effect" https://www.alternatehistory.com/wiki/doku.php?id=alternate_history:butterfly_effect
1- Phase of agreement : All the social contract about what the participants are going to do. It include the kind (grade) of butterfly effect. they could also define it with numeric parameters
- First strengh (crush an ant vs kill Napoleon)
2- Butterfly effect, as a tool in the game, could have a priority (before or after other rules) and a definite way to affect events.
For exemple :
- The more time passes, the more it spreads in terms of geographic scale
- The more time passes, the more the alea factor (chance, dice) can be important (on some events to define)
There could be other rules, like a way to absorb it (for exemple, if his effect is under a given level during a given period)