Well and truly stuck - Can anyone help please?

Advanced methods and approaches for solving Sudoku puzzles

Well and truly stuck - Can anyone help please?

I wonder whether any Sudoku fans who are brighter than me might be able to help me with a small clue as to the next step on the Very Hard shown below.

* 4 * * 3 7 2 6 *
1 2 * * * * * 7 3
* 3 7 2 * 8 9 * *
* * * * * 3 * * 6
2 6 * * * * 7 3 4
4 * 3 7 * * * * *
* * 2 5 * 1 3 * *
* 5 * * * * * * 2
* 1 * * 9 2 * 5 *

I've been puzzling over it for days without any joy and I suspect I'm missing something really obvious. Any help would be most gratefully received.

Regards to all.

Zeb
zebedee

Posts: 26
Joined: 27 March 2005

There is an X-wing in the number 4.

When you see that, and do all things this X-wing imply (as in, remove candidates from cells), then there will be only one place for the number 4 in box 5.
Animator

Posts: 469
Joined: 08 April 2005

Note though that there is also an X-wing in the numer 6...
Animator

Posts: 469
Joined: 08 April 2005

wat do you mean by an x wing
Guest

where is the x-wing?

How about a hint: what are the 4 verticies of the x-wing?
Thanks
chipe

Posts: 6
Joined: 26 April 2005

The x-wing of 4's - R3C5/C8 and R7C5/C8
joolslee

Posts: 29
Joined: 05 May 2005

thanks

thanks joolslee, I see it now, though the 4's x-wing didn't seem to accomplish much. Working with the 6's x-wing (row 3, columns 1 and 5; and row 7, columns 1 and 5) gave better results. Thanks again. ... ...... I finished it.
chipe

Posts: 6
Joined: 26 April 2005

Many thanks for the X-wings tips Animator. I have now managed to solve the puzzle. The X-wing in the 6s was the most useful hint.

Thanks again.

Zeb
zebedee

Posts: 26
Joined: 27 March 2005