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<@U7RGCMZPU> Let's say you have a model of the game rules + player capabilities + team capabilities + weather + randomness.  You create a model.  Your friend creates a model.  You run the simulation for an entire game, play-by-play, allow for in-game adjustments in accordance with the rules (ex, no changing the weather).

In a peer-to-peer system,one of you runs the game and transmits updates to the other.  You'll do some kind of message passing to share the initial models, in-game adjustments, and display updates.

When it comes time to save something, you'll have an object model that's the basis for the simulation.  This can be saved in total in a format like JSON which will be very close to your object model.  If you need to save something -- say the computer restarts -- you can save this as a file and optionally send it to your friend and/or the cloud.

An RDMBS could be used to support the service registry which manages the accounts.  This way the two game players can find each other.