I am playing a lot now, and it seems to me that AI in ver.15 is weaker than it was in ver.14. What I noticed: *Units in city do not even attempt to resist. *Enemy tries to attack one or two times, after this becomes passive. *Invasion armies are smaller *Catapults meets no resistance at all Maybe I've found a sort of general strategy flaw, e.g. my side develop better army and A.I. intentionaly decides to give up. Also I noticed that in ver.15 I can win with less resources than enemy has.