Solving by guessing


Is it possible to solve all soduku without guessing?

I don't think so but am open to be shown wrong.

Indicate which comments you would like to be able to see

Hi Graysmith,

IMO, it is possible to solve ALL sudokus without guessing - if you know, understand and can use ALL of the solving techniques currently known (I don't).

Obviously, the sudoku compilers/creators try their hardest to require new solving techniques.

30/Dec/10 9:15 PM
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I almost never resort to guessing. If I can't solve one without guessing, I start over and usually can get it.
31/Dec/10 4:04 AM
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IMO it depends on your definition of "guessing" and "solving". This may seem pedantic but has been the cause of many arguments previously.

Solving tends to be two categories:-
1 - Find a solution
2 - Prove that yours is the only solution

Defining guessing More...
09/Jan/11 11:39 PM
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Yes I was wrong that you have to guess. I have found Andrew Stewart's site SUDOKUWIKI.ORG.
I am amazed at the number of techniques available and will probably never master them all but so far I have used X WING and UNIQUE RECTANGLES to good effect.
In relation to Jimmy's comment I have a More...
17/Jan/11 10:27 AM
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Hi Graysmith,

Yes, Unique Rectangles are useful; if you like those, you certainly will find Steve's recent blog on uniqueness tecniques very useful.
27/Feb/11 10:51 PM
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