Yeah you really gotta give Charly some credit here. Remember that my first Cuir attempt was routed by him. It instilled in me a sense of awe for his production, technological and cultural prowess for the rest of the game. Also recall that a lot when wrong with the second Cuir attempt. I was initially plotting on Monty, and attacked the turn before an AP vote. Then, after 10 turns, he vassals to freaking Capac. Meaning I had to move my whole stack all the way up to SB. In hindsight, he should have been my first target. His land was the best, and that capital is just insane. It's my number 1 city in almost every respect. Super soft target and really easy to assimilate. So I could have conquered him in the 1200s. That would have been a completely different game. But with all of the contingencies, by the time I capped Capac, cuits weren't going to cut it against Ragnar and Charly. So that's that. But the game is still perfectly winnable.Shame you didn't complete the cuirs rush. It's an interesting map that did force you to rush an AI early on. The AI have performed quite well here. HRE quietly getting on with things.
Giving the AI a lot of free techs can just catapult them to getting much stronger.
Never really use espionage. I should probably be targeting a single AI on my games. Can be nice to steal techs on higher levels. Would I aim for a great spy as a strategy. No. If you build Great Wall it's harder to ignore.
I do look at the city details screen in my games. To make sure no cities are running city governor or have added random specialists. Pretty much most captured cities will be using city governor. City Details is the second drop down option on the city overview screen that lists all your cities.
I think one of the most striking differences between emperor and immortal to me is that on the latter, the game is never really over. AI that you let sit around become insane fortresses. I remember this one game with Darius, one of my better immortal wins so far, the last AI, Gilga, wiped out a stack of 30-40 tanks on turn 1 of the war with antitank guns. It didn't matter, because I ended up winning Diplo shortly after, but it's not like emperor (or immortal quechua rush) where at some point you're basically playing on sandbox mode. Immortal is never sandbox, you can actually undo your own advantage pretty easily.
Btw, I didn't know about that city details screen, will check it out!