I played another game as the US, Immortal, standard speed, huge Communitu_79a with Terra.
My plan was to grab and hold as much land as possible early on and to then expand to the second continent later on.
This was somewhat complicated by Songhai who managed to take over the territories of Austria, Siam, and parts of Byzantium, making them the strongest player in the Medieval and Renaissance Era.
At the height of their power Songhai controlled 21 Cities; it was pretty stressful to fend off their attacks, especially with a River leading into my territory.
However, since I for once wasn't the most hated player in the game I was able to sanction Songhai through the World Congress; because Songhai had almost no extra votes they never got to appeal the resolution.
Eventually I was able to outscale Songhai and I killed them with Landships, Artillery, and Lebensraum.
Everyone now hated me but with ~40 Cities under my control the game was basically over.
I eventually achieved a Culture Victory when I killed the only player that I wasn't yet influential with.
Some thoughts:
- The AI has seen significant improvements on the tactical level. I think a good way to complement this improvement would be to also work on long-term strategic planning; There is no point in being good at fighting battles if you're fighting battles where you're already at a disadvantage. In particular the logic for City placement could be improved. I think the AI currently does not do a good job at evaluating geographic barriers. They frequently settle Cities that are basically impossible to defend because it is separated by sea from their other Cities. I think the AI should prefer founding Cities on Tiles where there are geographic barriers pointing towards the Cities of other players and no geographic barriers pointing towards their own Cities. Also I think the AI are still not building enough Roads for military purposes. I think the optimal strategy would be to just build a Road on every Tile near a border to an enemy, but even just more connections between Cities would be a significant improvement. Currently the AI Road networks are something like a line or a star, a mesh would be better.
- When I formed Defensive Pacts against Songhai a weak Tradition Civ that I had made sure would like me so that I would have a trading partner suddenly declared war on one of the Civs that I had a Defensive Pact with. I think this was a really bad decision on their part because based on my own judgement of the diplomacy logic they would have never dared to declare war on just me. Case in point: they died.
- The AI seems to more frequently kill City States if they are affected by Open Door (and maybe Sphere of Influence?). I like this. It makes the AI feel like they are dynamically adjusting to the situation.
- The AI seems to have become better at using bombers. A few patches ago they would use them mostly to attack Cities, now they use them to focus down Units. The AI have also become better at intercepting bombers with fighters. What the AI are still struggling with are Carriers. They place them too close to the front lines which allows human players to easily focus them down and kill 4 Units at once.
- The AI is bad at utilizing Spies as Thieves. On huge maps where the number of Spies per Era is doubled this is particularly noticeable. The first problem seems to be that the AI do not seem to move their Great Works to their Capital where they cannot be stolen. The second problem seems to be that the AI either do not send enough Spies as Thieves or do not keep them in Cities long enough to steal a GW. Especially AI that are trying to achieve a Cultural Victory should be trying to steal more GWs I think.
- I didn't get constantly DOWed from the other side of the world but I also had a huge military so I don't know how things would have been if I had tried to get by with less Units.
- The Inquisition Enhancer Belief is pretty good. I usually take Zealotry for the extra Unit production but more Gold/less Unhappiness is also very useful.
- The AI has gotten pretty good at placing their Citadels.