Does any one know what formula is used when u press "instant resolve" ?

I did a lot of testing but still can't predict how it will end up, so it feels rly risky to press that button with out knowing what u will lose

Does somone know the exact mathematical formula for it ?

I don't know about the formula, but each unit (or rather each unit class) has an auto-resolve battle strength value assigned, which you check with Modding Tools, under the Unit Database :

example below, with the "Animal Class" : they have a -1 combat strength applied for auto-resolve.

From what I've seen, it ranges from -1 to 1, and applies to all classes, but I haven't checked it thoroughly.

Intresting,but that does not explain why the samw units can get different results.

3 scouts vs vs mamut can give anything from:

"Lose all 3 scouts" to " have 4 units afther battle"

Doesn't it just conduct the battle with both sides controlled by AI? This seems to me the only sensible way. Anyway, I don't click auto-resolve if it's possible that one of my units suicides.