AI cheating on single-player maps.

On a random map (XL, 8 slots, no underground, islands), one of the AI opponents, without a single obelisk on their island (out of approximately 20!!!) and only 1 day's travel from the city to the teleport on the island where there were only 2!! obelisks and the Grail was stored, somehow managed to dig up the Grail on the 1st attempt and bring it to their city in just 3 weeks, as witnessed by my observation (I was located nearby). This involved 2 heroes with 7 Phoenixes each + 2 Firebirds in the castle for 4 weeks (2 in the first week, +4 in the second week, +4 in the third week, and only with the Grail +6 in the fourth week – they couldn't hire any more, as the necessary buildings were missing). And that's not even considering the economic aspect...