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The Grail is nonsense on L-maps, especially since it can be dug up starting from 111 :)
Either ban placing it in Tower and Conflux, then it wouldn't matter.
Perhaps it's worth adding a rule to the Grail digging conditions, stating that it can only be dug up from the moment the player has uncovered a tile with a cross on the riddle map.
Otherwise, in fact, Redwhite just dug for it at random.

UTC+03:00, icq 593626431