DISCUSSIONS on “Rules for online games in HoMM3 and formulas for calculating player rating.”

rebellious, there is a logical passage that can physically be multiple, a logical multiple passage (each part of which, if not a teleport/portal, can be physically multiple – although I haven't checked). And this is not to mention the possibility of several parallel guards and the subjective desire to interpret the rules in one's favor (a quite real and understandable phenomenon). Even the newest players, and they also need to be considered, have only recently learned about templates and passages.

How can red know where the opponent's main city is?

Perhaps, we should leave it to the players' discretion to define "where the increase can affect the result"? I am sure that in 99.9% of cases, there will be no disagreements.
[off]Although, for the Arbitration Committee, only those 0.1% are important, for which they are contacted, and it is better for them to do it poorly, but reliably.[/off]