# 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.

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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 |  |
 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 |  |
 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 solution2 - Prove that yours is the only solution Defining guessing More... 09/Jan/11 11:39 PM |  |
 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 |  |
 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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