There are just 3 rules to Sudoku.
Each row must have the numbers 1-9 occuring just once.
Each column must have the numbers 1-9 occuring just once.
And the numbers 1-9 must occur just once in each of the 9 sub-boxes of the grid.
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Almost Finned SwordFish example
Every digit from 1 to 9 must appear:
In each of the columns,
in each of the rows,
and in each of the nine boxes.
Some Handy links are:
entry on Sudoku.
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