ai caravan: skip unknown cities
Don't consider trade route revenue with a city the AI player haven't seen. This is an optimization, not the fix to an info leak to the AI player. The caravan evaluation will detect that the target city is at an unknown tile and abort.
(Maybe the Cheating AI could be given the "Reveal_Cities" effect if it should be able to consider establishing a trade route with a city on a tile it never has seen before.)
#1 Updated by Marko Lindqvist 11 months ago
The fact the city is at known tile, does not prove the city itself is known. Also, you still don't make AI to consider destroyed cities it does not know to be destroyed. As you don't make limiting AI knowledge consistently, I would rather keep current feature that AI can use its omniscience to plan traderoute anywhere.