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won in the Facebook group, but it turned out he violated the rules – there were two paths to the center, he cleared one and, fully confident that he could move around freely, scouted the second path (which, due to the visibility, revealed the entire center and flanks). Apparently, a long period of inactivity in Heroes affected him, because it didn't even occur to him to clear the second path as well (of course, setting up a chain to clear it wouldn't have been a problem).
The opponent kindly offered a rematch, and suggested posting this game as a draw.