In the board game Thud!, how many trolls does it require to capture a lone dwarf? I can show a solution with nine. Can't quite get eight.
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...except for a L-shaped arrangement of three, which threatens a region not possible with any three separate trolls.
(Of course, in the "real" game, bunching together is more useful than in this problem.)
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Note that it isn't necessary to for the trolls threaten the *entire* board (which I don't think is possible even with nine of them)...
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Since the lone dwarf *must* move, it suffices to threaten the whole board except for one square...
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