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  • $\begingroup$ Similar: puzzling.stackexchange.com/questions/62780/… $\endgroup$ Commented Mar 10, 2024 at 2:58
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    $\begingroup$ The analysis of the linked puzzle works on this one too, at least to some extent, so the 7 empty spots in a 42-piece solution are very restricted in their arrangement. The coordinates of each space is either all even or all odd, and no two spaces have any coordinate in common. $\endgroup$ Commented Mar 10, 2024 at 10:34