Anybody knows the minimum requirements to have a rival?

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byebytoad

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Basically I got to a point where I have no rival since 30 years.
I kept my armies far below their limit hoping I'd get a rival to select (Ottomans is the only one nearby that could come close).

Does anybody what are exactly the criteria involved?
I thought they were army size x their strength and navy size x their strength.
I'm not really sure anymore if this is the case.
Ottomans have like like 290k troops while I have 370k troops.
On the navy side the difference is much wider , 48 vs 331 (heavies is 7 vs 42) , but I had rivals with similar differences in navy in the past.
Actually last time I was able to select Ottomans in this campaign as rival their navy strength was 10% of mine and the army strength was 50% of mine. I don't get why now with less gap between us I still can't select them.
 

Atlantians

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Can any of these values be modded?
 

HydroAC

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Also tech level matters. I've seen a neighbor tech up, then they are valid rivals again. It is interesting to farm Power Projections with a rival becoming invalid, then valid again.
 

Aythne

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Also tech level matters. I've seen a neighbor tech up, then they are valid rivals again. It is interesting to farm Power Projections with a rival becoming invalid, then valid again.

Tech level usually has to do with military strength, though, as modifiers and morale/tactics grow.