Stuck on difficult sudoku - help required!

Advanced methods and approaches for solving Sudoku puzzles

Stuck on difficult sudoku - help required!

Postby gasdoc » Sun Jun 05, 2005 8:09 pm

Yes, yet another newbie who's discovered the sudoku craze.

This one has got me stumped. Can any of you sudoku experts explain how I should proceed?

Oh, and I cannot fathom out that xwing business!

Paul

0 0 0 0 5 0 0 0 0
0 0 9 0 4 6 8 0 5
0 5 7 0 0 0 2 4 0
0 8 0 9 0 4 0 0 0
2 0 0 0 6 0 0 8 3
0 0 0 3 0 8 0 1 0
0 4 8 0 0 0 3 5 0
0 0 1 4 0 0 7 0 0
0 0 0 0 9 0 0 0 0
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Postby Animator » Sun Jun 05, 2005 9:02 pm

Take a close look at box 5. Then look at row 5, if you done a good job by looking at box 5 then you are able to fill in a number in that row...
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Postby gasdoc » Sun Jun 05, 2005 10:19 pm

do you mean the 4 in column 3 row 5?

Go on, explain the x wing thing properly then!!!

Thanks,

Paul
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Postby gasdoc » Sun Jun 05, 2005 10:38 pm

Completed it now - thanks again!

Don't you just hate it when you've missed something!
I must have been looking at that one for an hour until you gave me the hint & it was staring me in the face!
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Postby pueblo » Fri Jun 10, 2005 8:21 pm

Concentrating on box 5 and row 5, I got the 4 in r5c3, and a 9 in r5c7.

But now I am stuck again. Any hints as to where I should look? I feel it might still be box or row 5, or I must be missing the obvious.
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Postby Animator » Fri Jun 10, 2005 9:03 pm

You are missing one obvious move... take a close look at the number 4 and after that the number 8, and after that again the number 4 and then the number 2.

(There also is a somewhat harder move involving the number 3)
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Postby pueblo » Fri Jun 10, 2005 9:53 pm

Yes, the 4 and 8 were the obvious ones I was missing. Too many pencil marks on my page.
Thanks!
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