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Well, now I'm starting to doubt whether it's "okay to play with the Grail?" - but the fact that you opened all the obelisks is really commendable... even though there are no complaints that you dug it up on the first try ;) , because sometimes people dig it up on the first try even without a "map-riddle," which is quite suspicious.
And what's so suspicious about that? It's as if you haven't found yourself in this situation before...
Yes, and one more thing: you're writing about a duel... - so what? That's exactly what it is: a fair competition for the player, within the existing rules, and whoever digs it up first doesn't make it an "anti-duel," but rather shows the skill level of that person. What's wrong with that?
"Единственное, что можно сказать с уверенностью об удаче - она изменит..."