Solving by guessing

Submitted By: GRAYSMITH from NEWCASTLE

Is it possible to solve all soduku without guessing?

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

5 Comments
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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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