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The day before yesterday, around midnight, I suddenly encountered another instance of AI cheating! Here's what happened: during Arlash's (green) turn, he landed on the island, entered the seer's hut, and... shamelessly flew around the white border gates, capturing my 2 Portal of Glory! After a little investigation, I exposed him: according to the rules, he couldn't have done that!
On either side of the Portals of Glory, there are obstacles arranged in such a way that without Flight / Dimension Door / Angel Wings, you can only reach them through the white border gates. But:
1) There is only one white tent on the map, on my starting location, and no enemy has visited it yet!
2) The Flight and Dimension Door spells are prohibited on the map!
3) There are artifacts on the map that grant the ability to fly, but I already knew that Green hadn't reached them. And two days later (he was stuck on the island the whole time: the poor guy ran out of mana:)), I reached him, defeated him, and obtained proof: he only had the Amulet of Clairvoyance!
4) The seer is also not involved: he requests the Angel Alliance, which Arlash does not have.
Here, I offer everyone who wants to see for themselves:
1) a screenshot of the island (for clarity, I removed the magic clouds) with highlighted paths;
2) an autosave, from which the described outrage occurs when the turn is passed;
3) a save made two days later: you can defeat Arlash yourself, and his artifacts will become yours.