I guess I'm a allow learner, but
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×I already thought of that solution. But... The three tiles that you want to block don't touch. So I have available: Beethro's body (check), the roach (check). And now my sword can't reach the third hot tile
Steam of consciousness comment below, guess I solved it, but can't check because I have no computer here.
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× Solution (I think): three sword can block of a tile, even if it can't hover above the tile itself.
Thnx for the nudge, Bent.
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Autocorrect is
not my friend. Apologies for the typos.