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How do you tackle a sudoku puzzle? (lemmy.ml)

submitted 1 year ago by aRatherDapperFox@lemmy.ml to c/asklemmy@lemmy.ml

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When you first crack open a new sudoku puzzle, do you look at the rows or columns first? Or do you work in blocks? What's your strategy?

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[–] Gurfaild@feddit.de 1 points 1 year ago* (last edited 1 year ago)

For each number, I mark all cells where I know I can't put it.

If one block, column or row has only one possible cell where a number can be, I put it there and then update all cells where I now know I can't put it anymore.

This algorithm probably isn't the fastest, but it's easy to do manually and it has the advantage that you don't need to backtrack.