I asked the question about how the AIs can do so well at research while building so many cities at the same time. Here's a specific example of a multi-player game my buddie and I are playing against two AIs:
* I am playing Huayna Capac (Ican) who is Industrious and Financial.
* My buddy is playing Elizabeth (Philosophical and Financial)
* One of the AIs is Ottoman, Suleiman (Imperialistic and Financial)
* The other AI is Korean, Wang Kon (Financial and Protective)
As soon as one of us gets alphabet, we exchange techs (my buddy and me), yet we can't keep up with Suleiman. Both he and the Korean build cities like crazy, and when we try that, our research and economy drop so low, we can't keep up. By the way, we are all playing at Noble level.
The victory condition in this game is only "Space Race Victory". When we played this game the first time, Suleiman got there first. I had started building my space ship, but was not close to finishing.
We are playing on a huge flat land map with inland sea, starting at ancient tech, and playing in quick mode.
In this game I built almost every wonder you can think of, yet still could not manage to keep up with the AIs with their city spamming. Each of us started so far away from each other that we could not launch an early attack without stretching our forces too thin. No one ever declared war on anyone in this game.
We re-started the game at the beginning and are trying a little different strategy. We want to attach the Ottoman as soon as possible, but we are not even close to being able to do this and he is already ahead of us in tech.
So, what is the best strategy in this particular game for my buddy and I to use against these two tough AI opponents? Thanks for your input.