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eternity-ii

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Xam3k / diamond_dilemma_puzzle_solvers

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Solvers, records, and negative results for the never-solved gold challenge of the Diamond Dilemma (1988 prize puzzle): 142/160 tiles placed perfectly, 208/240 edges matched, and a documented map of every approach ( exhaustive C solver with CP-SAT oracle, large-neighbourhood optimizers,...)..

puzzle constraint-programming local-search combinatorial-optimization or-tools eternity2 unsolved cp-sat-or-tools edge-matching-puzzle eternity-ii
  • Updated Jul 22, 2026
  • Python

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