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Regarding the Grail.
According to the rules, it is forbidden to dig it up before 6 weeks, i.e., to retrieve the Grail from the ground. The player acts as a minesweeper here; if the Grail is dug up before 6 weeks, they may be given a technical defeat. Of course, they are not prohibited from attempting to dig it up, but one wrong move that leads to the Grail being dug up before 6 weeks means game over.
I interpret the rules this way.