Trusted allies in 1.02

[FactionHeir]

Its somewhere in the hardcode I think.
As for ally auto declare, that was part of 1.02L. Allies would declare war on mutual enemies unless allied to the faction you go to war with, in which case its random who they break alliance with (they won't declare war just yet then until a bit later)

[dopp]

Sea invasion is handled by "can_force_invade=true" in the code.

Ally auto-declare is disabled in official v1.2 for reasons unknown.

I strongly, strongly suspect that in official v1.2 the reputation of your ally must be mixed or higher for them to honor the alliance agreement, while in leaked v1.2 their reputation made no difference.

Also, there's a series of random checks present in official v1.2 (dunno about leaked) that allows the computer to backstab you anyway if they are failed.

- If you are a trusted ally: 90% chance no invasion.
- If you are an ally and he's trustworthy (0.5): 80% chance no invasion.
- If you are an ally and he loves you (0.5) and he's not a backstabber (-0.1): 80% chance again.
- If you are an ally and he sort of likes you (0.25) and he's not a treacherous git (-0.25): 65% chance no invasion.
- If you are an ally and he doesn't mind you (0.0) and he's not the sneaky type (-0.25): 50% chance no invasion (naval/scripted invasions allowed).
- If you are neutral and he loves you (0.5): 75% chance no invasion (naval/scripted invasions allowed).
- If you are neutral and he sort of likes you (0.25): 50% chance no invasion (naval/scripted invasions allowed).
- If you are neutral and he doesn't mind you (0.0): 25% chance no invasion (naval scripted invasions allowed).
- If you have been allied or under ceasefire for less than 10 turns and he is trustworthy (0.25): No invasion.
- If you have been allied or under ceasefire for less than 3 turns: No invasion.
- Otherwise, look to your border defenses, production rating and deep strategic reserves to dissuade the enemy from attacking.

As you can see, no foolproof alliances. You have to work on keeping relations high, making sure your borders are strong and never trust a successful AI faction (the more successful they are, the more likely they have done enough sacking/extermination/assassination/spying/diplomatic insulting/random invasions to cause their reputation to plummet) to keep its word for more than 3 turns.

[Tran]

Sea invasion is handled by "can_force_invade=true" in the code.

Does it mean if we change the code into "can_force_invade=false" the ally or other faction won't backstab/attack in a non-sense way by sea?

- If you are a trusted ally: 90% chance no invasion.

What's the clasification or requirement for being a trusted ally?

[dopp]

Yes. Naval invasions are considered 'forced' invasions.

How you (the player) can spot a trusted ally as of official v1.2:

- You must love him (0.5). Not necessary in the case of human player.
- He must love you (0.5).
- You must not be a backstabber (-0.1).
- He must not be a backstabber (-0.1).

[FactionHeir]

He still must like you more than 0 though (note -1 to +1, where 0 is dead center)

While naval invasions are part of force_invade, turning it off means AI factions won't ferry troops on ships anymore last I heard

[dopp]

(-0.1) seems to be the default for 'neutral' reputation throughout the file. Leaves a bit of wiggle room for diplomatic insults and perhaps the odd sacking or two.

[FactionHeir]

Well diplomatic insults don't hurt your rep, only your relations. I meant 0.0 for relations anyway :p
Rep -0.1 is the level between mixed and the next one I think. Still displays as mixed unless the levels were changed from 0.2 increments.

[dopp]

Yeah first threshold for negative rep to display is dubious (-0.2), so -0.1 still displays as mixed.