Here's another Thud! endgame solution. Eight carefully arranged trolls trap the lone remaining dwarf in one of the free spacespic.twitter.com/OKjmPTx7jv
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Alternatively, if the dwarf is in one of the groups of three spaces, they have free run of that little area but cannot reach the other.
Without loss of generality, let's suppose the dwarf is trapped in the top left group of three spaces.
Move the top right troll left. Move the uppermost troll left. Move the bottom left troll up. Move the leftmost troll up. The trap closes.
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