The New Sudoku Players' Forum

[Bernard Stay]

The following "very hard" puzzle is offered on one of the Su Doku software sites:-

*43|*8*|25*
6**|***|***
***|**1|*94

9**|**4|*7*
***|6*8|***
*1*|2**|**3

82*|5**|***
***|***|**5
*34|*9*|71*

I resorted to the "x-wing" technique to solve it, though I don't know whether that was entirely necessary. Perhaps someone else would like to have a go and confirm (or otherwise).

[Sue De Coq]

IMHO, you couldn't do it without an X-Wing (in the 6s).

[su_doku]

Bernard this is the same puzzle which IJ initiated and which brought out the x-wings theory - see under the Times puzzles postings - and in which you participated - your comment below to jog your memory

MB


Bernard Stay

Posted: Tue Mar 29, 2005 6:56 pm Post subject:

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Well, (my pennyworth) I can't see any way beyond the position shown.

Wayne?

[I solved it by trying first 7 then 6 in r1c6 - in the latter case it comes out]

I'd be very interested in a true logical solution - if there is one.

[Bernard Stay]

So it is! Silly me, I should have checked.