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The Grail is not prohibited. It's not stated in the rules.
Those who don’t remember should carefully read post #29 of the thread “Reports on victories and defeats”
here is a link to it /topic/at/84678/
Added 16 minutes ago
And I join in. I dug up the GRAIL and placed it. And let someone try to dispute my right to do so.
On this "map," playing Barbarians against Castle is like banging your head against a wall. And my plan was precisely to use the Grail to win. First, I opened all the obelisks, including those on the opponent's respawn (sacrificing my main hero with 2 Behemoths, 2 Phoenixes, and some other minor units).
If it weren't for the Grail, there would be no options. No artifacts, no Dragon Utopia. A pure dueling map. And as some write, that this isn't an indicator of skill – then what is an indicator of skill? A battle against hundreds of archers and a crowd of monks, with expert blessing and shooting from a hundred orcs. Or: how to kill an Archangel?
It was a tactical plan that brought me victory.
We played for six and a half hours. And I don't have the opportunity to replay this game with Tieru!!! I already sacrificed a day off. Sorry!
Skill lies in duels ;)
This is the most important thing you should have adhered to! To dig up the Grail, specifically by opening all the obelisks (in this case, of course, if they are placed honestly - which is exactly the case on this map) is not so simple.