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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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.
Eight trolls is slightly too few to threaten the entire Thud! board, but just creating isolated free pockets seems to be effective.
Ensuring that those pockets are isolated is tricky. Closing the trap, once created, also tricky. Still...
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