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The most basic strategy to solve a Sudoku puzzle is to first write down, in each empty cell, all possible entries that will not contradict the One Rule with respect to the given cells. If a cell ends up having only one possible entry, it is a "forced" entry that you should fill in.

The Math Behind Sudoku: Solving Strategy - Department of Mathematics

pi.math.cornell.edu : ~mec : Summer2009 : Mahmood : Solve

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The 45 Rule\n\n An essential Killer Sudoku solving technique is the "45 rule". This uses the fact that every row, column and block must contain each of the numbers 1 to 9 once. Therefore, the total of all numbers in one row, column or block will always be 45.

Killer Sudoku Solving Techniques and Tips - Sudoku Solver

sudokusolver : play : killer

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