Sudoku Correction

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Sudoku Correction

Postby Pyrrhon » Thu Nov 16, 2006 9:54 pm

On the page of Inaba Naoki I found a puzzle type called number correction. I've it sudokified and here is a puzzle:

Change some digits in the grid so that every row, every column, and every 3x3 box contains the digits 1 through 9 and so that no pair of changed digits is horizontal or vertical adjazent (diagonally adjazent changed cells are allowed).

Image
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Postby Smythe Dakota » Sat Nov 18, 2006 1:40 pm

So, in theory you could change as many as 41 cells?

Bill Smythe
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Postby udosuk » Sun Nov 19, 2006 3:07 am

Smythe Dakota wrote:So, in theory you could change as many as 41 cells?

Yes, but not in this one...

Hint:

If you see a cell touching 2 other cells containing the same digit in a row/column/box, that cell must stay unchanged.

:idea:
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