Advanced methods and approaches for solving Sudoku puzzles

Please can someone offer me some help with this very hard puzzle. It has occupied my whole weekend and I am seriously frustrated !

*8*|746|329
632|**9|***
794|32*|16*

**8|63*|*1*
***|2**|6**
*26|*94|8**

*67|9*3|48*
***|8**|*36
853|462|**1

This is as far as I could get and I have checked and this is correct so far. Any assistance would be much appreciated
Nick

Posts: 2
Joined: 20 April 2005

Looks like an X-wing - digit 1, cols 2 & 6.
Guest

And when you found that one you find another X-Wing (with the number 5), or atleast I did...

Second X-Wing: look at column 4 and column 8
Animator

Posts: 469
Joined: 08 April 2005

Thanks, it's easy with a little help!!
Nick

Posts: 2
Joined: 20 April 2005

Through T & E:

The pair "7" and "9" are the only numbers for r9c7 and r9c8

r9c7 must be "9".

Then the su doku puzzle can be solved.

If you place a "7" in r9c7, you will end up with an empty cell with no
pencil marks in r8c1.
Guest