The New Sudoku Players' Forum

[Pyrrhon]

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).

[Smythe Dakota]

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

Bill Smythe

[udosuk]

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.