Game technique · Sudoku
ALS-XZ in Sudoku
An almost-locked set has one more candidate digit than cells. Two such sets can interact through a restricted common digit.
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An almost-locked set has one more candidate digit than cells. Two such sets can interact through a restricted common digit.
Example
If the restricted digit must occur in one set, another shared digit can be removed from cells that see all its positions in both sets.
Key point
An almost-locked set has one more candidate digit than cells. Two such sets can interact through a restricted common digit.