Rapids may not cross holes already cut. On an instrument panel, mounting
holes either side of a cutout become unreachable from each other once
the cutout is cut, so the holes must come first. The contour-by-contour
search backtracks chronologically through every entry combination of
the last holes before it changes their order, and ran out of budget.
Supplied-blank doors fell to an unverified safest route.
Three changes:
- Contour recovery, the part solver that memoizes failed states, now
runs for display-perimeter parts too: their holes are the whole part,
with no outside cut to finish on.
- A door alone on its sheet gets the recovery pass first. Any other
lone part keeps the plain search, whose routes are shorter.
- Recovery learns, as whole-part ordering does: a hop onto a hole that
crosses holes of the chain teaches "cut it before them" (skipping any
rule that closes a cycle) and restarts the chain, with holes still
waiting for a prerequisite ranked last. Rules only order candidates;
no hole is skipped. Until a rule is learned the chain is unchanged.
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