Hearts of Iron IV

Hearts of Iron IV

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Improved AI Research
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20 Jan, 2019 @ 11:53am
9 Sep @ 11:00am
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Improved AI Research

Description
Improved AI Research
*Supported game version: 1.14.8

This is my personal AI mod that tweaks AI behavior and makes it a bit better (or less stupid at least). It alters what AIs research and when, improves production of many countries, improves templates & unit variety, fixes some bugs, and introduces more scripts to major AIs, so they can deal better with some common situations. It also modifies some historical AI focus paths to better match history.

This mod is generally compatible with other mods that don't modify vanilla tech tree.
NOT Ironman Compatible. Should not be combined with other AI mods, like Expert AI.

General Changes:
- More accurate historical focuses / wars – Phoney War happens
- Many AI countries have had their research priorities and unit templates altered. They should mostly focus on and build what they did historically (while also being a bit more of a challenge)
- All AIs now know what a Motorized division is and how to build it
- AIs will pick certain appropriate Spirits in historical mode (and not just pick them entirely at random)
- Improved how AIs research Naval/Air/Tank modules, they should now have all the required techs in time to be able to produce the historical preset designs
- Turkey will stop joining allies in 1944 automatically (can now choose either faction depending on who's winning)
- Fixed Denmark triggering an unhistorical war between Soviets and Japan (by declaring independence)
- Fixed the Aircraft designer often assigning wrong icons/models
- Modified the aircraft presets (to be hist.accurate) and added some new ones, including post ww2 (for most majors)


Germany
- More historical AI behavior – will not invade Benelux immediately following a war with Poland, but Denmark first and Benelux later = Phoney war (about 09-1939 – 04-1940)
- won't call Axis minors and Italy to war too early (in historical mode)
- if Italy fails to pacify Ethiopia, will avoid a faction with it to not get drawn into offensive war too early
- historical AI will prefer certain historical advisors/companies more and focus on building submarines
- will research and use heavy fighters (and later jets), heavy tanks, tank destroyers, mechanized etc...
- slightly improved buildup strategy – build order, advisors, army training & template priorities
- AI will produce much more Aircraft overall, which should make it a more long-lasting opponent
- AI should try to avoid losing all aircraft fighting UK
- AI will be more likely to try a naval invasion of UK
- will be more aggressive towards Greece and try to capitulate it before attacking USSR (hist.focus)
- AI will stop sending its army on sightseeing sea trips around the world, when they're needed in Europe
- reduced German AI desire to accept central/south american minors into its faction, while still being at peace (so something like warmongering Mexico attacking El Salvador does not draw Germany into early war with other majors)
- added some scripts so it should no longer declare war on 8 different nations ('One at a time')
- will build more synthetic refineries on demand

USSR
- Changed the AI historical focus path, so it includes some historical things
- added many real Aircraft Designer presets replacing the generic it used
- AI will hire some useful advisors/companies and not waste all PP on colorful propaganda posters
- Soviet AI taught what Anti-soviet pact means and that fighting Poland helped by Germany, Japan, Allies, and half of world at the same time in 1939 is a bad idea
- AI won't mindlessly prospect for resources it already has plenty of (frees up lot of CIVs)
- AI should take the decision to remove Anti-Soviet debuffs, if it's losing a war
- AI should occasionally use the other decisions to decrease paranoia as well during the purge
- AI should mobilize its economy and increase conscription faster during a war

USA
- USA focuses more on Air/Naval techs
- will research & build synthetic refineries, if Indochina rubber sources are threatened
- will now use the prospecting decisions and get more resources
- AI will keep higher Military/Civilian Factory ratio when at war
- will build a larger Air Force, including a lot of strategic bombers and long range heavy fighters
- will produce more armored divisions and some motorized divisions

Japan
- will pursue Naval Techs & Doctrines more
- More historical Japan behavior – will attack USA later (not in spring 1941)
- will select Supremacy of Will focus instead of Supr. of Technology (seems more historical)
- AI will replace lost convoys
- improved what AI builds and when

The United Kingdom
- Will produce more Fighters and aircraft in general
- Will research and use heavy fighters more
- Will produce strategic bombers in large numbers
- Will keep more of their troops in the home isles when enemy invasion is possible

France
- AI historical focus changed to be more in line with actual history
- will think twice before declaring any war if it still has 'disjointed government' idea (non-historical games)

Other changes
- Improved how AI changes economy/trade laws (AIs will stop limiting/closing economy for no reason)
- AI should now prio Manpower/Economy/Trade laws in this order, not the other way around
- AIs should care more about low stability and will always try to improve it above 50%
- AI should use War Bonds decision more
- AI will not ignore the one-time war support decisions
- AI should not ignore army mutinies/other crises if the first attempt to solve it fails
- AI should waste less PP on various things if they need it for manpower/economy laws
- AI Countries should again send volunteers to Spain (for those without La Résistance)
- Minor nations won't be repeatedly seizing civilian trains for no reason and just because they can (and lose lot of stability in the process)
- AI Countries won't raise recruitment higher than Service by Req., when capitulated (so that their industry actually works when liberated, they can't switch back from Scrapping the barrel)
- Nationalist Spain & Vichy France - will send volunteers to Germany against the Soviet Union
- Italy should leave Switzerland alone (hist.focus), it should also build more light tanks and not delete them immediately
- Poland & Czechoslovakia - will not be AFK until tanks invade them, will train more units and try to improve their unit templates sooner
- Ireland will always choose a neutrality path (hist.focus)
- Switzerland will remain neutral (If you lack 'BBA' DLC)
- Hungary – increased focus on motorization
- Many more tiny AI fixes and tweaks that don't fit here

My other mods:
1939 Start Fixed (Fully compatible)
Popular Discussions View All (2)
3
19 Oct, 2023 @ 5:30pm
Problems
Riekopo
6
4 Apr, 2023 @ 2:45pm
Questions
Riekopo
138 Comments
Hitokiri Battōsai 13 Sep @ 2:49pm 
It works with non historical AI?
Crispin 12 Sep @ 12:57pm 
Thank you.
KubiG  [author] 9 Sep @ 2:25pm 
I've uploaded a new mod version, -per update notes- if you encounter CTDs while using this mod, I recommend starting a new game (not loading a save), that fixes the issue. The latest war effort patch made changes to a game file this mod needs and it made the game unstable. Unfortunately saved games keep the original and it causes problems...
KubiG  [author] 25 Aug @ 9:55am 
The Allies are a bigger threat, and USSR certainly is a bit more durable, but I'm afraid as Germany if you know what you're doing, unless you buff the enemy AIs considerably, and/or deliberately avoid any meta designs and AI exploits/weaknesses, they'll have a very hard time 'defeating' you. Mods can improve the AI only to a limited degree.
Speed Racist 24 Aug @ 3:40pm 
Does this make the Allied better in dealing with the Axis in Europe and Africa? I'm looking for any mod that can make the Allies win in their respective theaters and not be stuck sending countless divisions to die in naval invasions in Northern Italy, Greece or Romania in 1942. I'm basically looking for a way of losing as Germany historically
KubiG  [author] 22 Aug @ 7:34am 
Japan seems fine. Yes Germany struggled quite a bit for some time, the latest 2 mod updates were aimed at fixing that. It seems I found a solution that works for the AI and I'm happy with it.

I never really found out why was it happening. My theory:
Part 1: The Phoney War makes it more difficult for Germany to prepare (less time, less equipment)
Part 2: The Allies fight back more and had a tendency to wipe out Luftwaffe (which is kinda historical), but if they lost too many planes they couldn't defeat USSR's airforce quickly enough, Part 3: Germany's templates weren't very good
Part 4: Soviets play better in this mod and are harder to defeat (at least I think, some people commented they are harder to kill)
donald.grape 21 Aug @ 1:52pm 
Correction: Sorry for the mistake, Japan does indeed get Ichi Go. So how about make Germany stronger in the east? They can barely reach Minsk and Kiev, that's worse than without the mod where they reach Leningrad and Moscow.
donald.grape 21 Aug @ 1:08pm 
Could you make Japan pick Ichi Go decision to have an easier time in China?
modelcitizen 30 Jul @ 8:21pm 
Thanks for another update. As usual, great work!
TERRAKOTTA 7 Jun @ 4:48am 
Improved AI Research compatible with Reworked Air Designer?