As well as producing our own proofs, we also accept (and encourage!) submissions from players. If you have a proof that you would like to share, then send us an email so we can work something out.
Tough Sudoku, 14/Sept/2005.
Tough Sudoku, 18/Sept/2005 (Bruno).
Tough Sudoku, 18/Sept/2005 (Andrei).
For more sudoku proofs check out
Bruno's Sudoku Proofs
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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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