The techniques
The technique shelf: the algorithms and pruning ideas that recur in every serious Eternity II solver, each with what it is, what it costs, and what it actually bought when measured on this puzzle.
pageUpdated 2026-07-02
The technique shelf: the algorithms and pruning ideas that recur in every serious Eternity II solver, each with what it is, what it costs, and what it actually bought when measured on this puzzle.
The technique shelf: the algorithms and pruning ideas that recur in every serious Eternity II solver, each with what it is, what it costs, and what it actually bought when measured on this puzzle.
New here, or want the whole territory at once? Start with a map of every known approach: every family of attack on one page, what each reached, and where it walls out.
These are not Eternity II inventions: they come from constraint programming, combinatorics and cryptanalysis, and each page names its inventor and cites the original paper. What this shelf adds is the candid part: how each technique behaves when pointed at this particular puzzle, with the project's own measurements where they exist and a plain "unmeasured" where they do not. Every page teaches by doing: an interactive lab you can poke at, a step-by-step walkthrough on the same instance, and what the algorithm actually costs.
The solver catalogue shows how record engines assemble these parts; the dead ends page lists the techniques that sounded just as good and didn't survive contact.