now I have a question. how does you have wisely chosen your civics bonus work. I guess it doesnt work with pyramids because the info screen show req. constitution for representation bonus. Maybe i should put it more precise
-We dont have the required techs but have pyramids can we get the bonus
Yes:
For example, either you or the AI Leader that has Representation as a favorite civic must have Constitution; the other doesn't need Constitution if it owns The Pyramids. Same thing for Hereditary Rule: either you or the AI Leader must have the enabling Technology of Monarchy or own The Pyramids. Thus it doesn't matter how you or the AI Leader are able the run the favorite civic as long as both of you are running it.
Note that the required Technology to run the favorite civic is very important in itself though. It determines which in eras a favorite civic is viable. Early favorite civics like Organized Religion are viable only from the Classical Era until AIs start running Free Religion. Here again, Representation is a good example of a favorite civic that is viable only from the Renaissance Era to Modern Era.
-the longer we stay on that civic the more bonus we get right?
Yes:
One gets a favorite civic bonus with an AI Leader only as long as both you and the AI are running their favorite civic. The bonus starts at +1 and increments every 10t to the AI Leader's maximum favorite civic bonus.
-what about AI civic choice. Does the AI have to adopt the same civic so we can get the bonus. If so what happens if the ai changes the civic. If it is not about civic choice do they have to meet the tech requirements to love us.
and the most interesting one
As soon as you or the AI Leader switch to a different civic, you lose the entire bonus. If you or the AI Leader switch back quickly you should regain your previous favorite civic bonus. However, the resumption bonus will decline over time the longer both of you are not running the AI Leader's favorite civic.
-do they love me more if I am the only one that adopts that civic or it is irrevelant. Say if I have all the leaders with who have heridatery rule as fav. civic which give +1-4 bonus. Do I get the same or more if have five leaders with five different favourite civics(+1-4 bonus) and adopt all those civics.
The favorite civic bonus improves only every 10t and only to the specific AI Leader's maximum. It doesn't matter how many or how few AI Leader's share the favorite civic, the bonus is the same up to each AI Leader's maximum bonus for favorite civic.
Additional thoughts:
You can have a maximum of five different civics, one per each civic category. However, you can have multiple AI Leaders with the same favorite civic. For example, Hatshepsut, Ramesses II, Suryavarman II and Brennus all have Organized Religion as their favorite civic. However, it is usually only practical to have two of these four in any game, since their peace weights range from the highest (9), Hatshepsut, to the lowest (0), Brennus. Hatshepsut (9) and Ramesses II (6) usually get along ok. Also, Suryavarman II (1) and Brennus (0) will get along with each other as well as any pair of low peace weight leaders does.
Only a single civic matters for the favorite civic bonus, the AI Leader's favorite civic. No other civic matters for the favorite civic bonus to apply and no other civic will increase the bonus nor does the # AI Leaders running the favorite civic have any effect on the size of the bonus.
Note that is may be possible to bribe an AI Leader to adopt its favorite civic (as long as its been at least 5 turns since this AI Leader has done a civics change). This tactic may have limited effectiveness when the AI Leader doesn't really want to stay in its favorite civic, such as Hatshepsut staying in Organized Religion when she wants Free Religion, because she has 3-4 religions in every city and badly wants the Happiness bonus. Sometimes the cost of the bribe is free when the AI Leader would have done it on its own, eventually; but why wait, when a zero cost bribe will do the trick?
Sun Tzu Wu