About the AI: i releasently played a network game with my brother and an we both lost the game (was 2
against 4, non-exhausting mines) :-D. There are surely possible improvements, but all in all, it's great
work in my opinion (i say that from programmer's and player's point of view). Anyway, if you need a really
challanging fight you should either make the AI cheating or play against human players - that counts for
most if not all of the strategy games.
About the seafaring system: i actually like it the way it is. I don't think there's a "perfect" solution
for that, but you need a way to attack from one island to another. However, there are real "economical"
problems on sea-maps, which i think have to do with pathfinding. E.g. lumber from wood-cutters on one
island is brought to the saw-mill of another island, which leads to a 0%-saw-mill on the first island. The
same effect appears for lots of other building when i play. (okey, rather an offtopic point, better for