Diplomacy overexpansion penalty?

[prokolyo]

I'm pretty sure the amount and exact behavior is different in Caster of Magic and MoM 1.50 by now.
I found the CoM version in the changelog at 5.28 :

-New overextension warning formula for diplomacy.
Players are allowed to have 5 cities plus one more per year elapsed in the game without any effect on Fair land size. This amount increases/decreases by 25% for each level of land size setting. Players exceeding this amount will receive a warning from all other nonallied, contacted wizards, that has a strength of (3+difficulty), plus 20% for each additional city they exceed that amount by.
-Overextension warning chance is now rolled separately for each enemy wizard instead of one roll triggering the warning from all other wizards at the same time.

So it was 5+years, I wasn't sure if it's 3 or 7, well, neither.
One thing that's not specified here though is WHEN this triggers, I mean how often. Obviously it's not every turn, it even mentions that.

Just checking if this is outdated or I'm miscalculating - I had 9 cities in Dec 1410, small land, and conquered a new one. According to the formula (should be 10 elapsed years), (5+10)x0.75=11.25. So I should be able to have up to 11 cities. I got warnings by both other wizards though. What gives?

EDIT: I also tried another thing - waited a turn, which brought the date to Jan 1411. That should have made another year pass but I still got the warnings.

[prokolyo]

And another question about overextension - do AIs try to stay within the constraint of the formula? Maybe based on personality? And do these warnings go out amongst them, or it's only AI to human warning?

[Seravy]

No, they don't hold back on expansion but yes the warnings do apply between AI as far as I remember, well, the relation penalty part of it anyway, as AI's don't actually have a warning system (no one will see the text anyway).