Artificial Intelligence / AI 0195 · Atom · ~20 seconds
"More Rules Make It Harder"
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More rules can mean fewer solutions exist and, at the same time, less work to find one — because every rule announces impossibilities the solver can cash in.
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Sparse Sudoku puzzles are the brutal ones: few clues, little to propagate, long stretches of trial.
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The hard region is the middle: enough constraints to kill most assignments, too few to expose the killings cheaply.
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