Challenger Sudoku help

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Challenger Sudoku help

Postby JeJ » Tue Jan 11, 2011 2:27 am

This is the last puzzle in the Challenger section in the World Sudoku magazine from Spring 2007, so i guess it is the most complicated.
The original game is:
Code: Select all
. . 2|. . 3|. . .
9 . .|. . 8|. 1 7
. . .|2 . .|3 . 4
-----------------
. . 1|7 . .|. 6 .
2 . .|. 4 .|. . 3
. 5 .|. . 6|1 . .
-----------------
5 . 3|. . 9|. . .
7 8 .|1 . .|. . 2
. . .|3 . .|9 . .


And what I have so far after having found a hidden pair (1,9) and eliminating many pencilmarks is:
Code: Select all
18   147  2   |45   19   3   |568  589  569
9    3    45  |456  56   8   |2    1    7
168  17   56  |2    19   57  |3    589  4
--------------------------------------------
3    9    1   |7    28   25  |4    6    58
2    6    8   |59   4    1   |57   579  3
4    5    7   |89   3    6   |1    2    89
--------------------------------------------
5    124  3   |68   278  9   |678  478  16
7    8    9   |1    56   4   |56   3    2
16   124  46  |3    278  257 |9    4578 15


I am hoping the solution is not some pair I haven't seen. I have tried some forcing chains that haven't worked. Could someone please tell me how to finish this? Thanks.
JeJ
 
Posts: 76
Joined: 06 January 2011

Re: Challenger Sudoku help

Postby daj95376 » Tue Jan 11, 2011 3:42 am

Worse ... check [b2].
daj95376
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Re: Challenger Sudoku help

Postby JeJ » Tue Jan 11, 2011 4:57 am

daj95376 wrote:Worse ... check [b2].

You lost me. What is wrong with that 3 in [b2]? All the 3's in every section are already there.
JeJ
 
Posts: 76
Joined: 06 January 2011

Re: Challenger Sudoku help

Postby daj95376 » Tue Jan 11, 2011 5:40 am

JeJ wrote:
daj95376 wrote:Worse ... check [b2].

You lost me. What is wrong with that 3 in [b2]? All the 3's in every section are already there.

Sorry for the brevity. I was asking you to check the contents of box 2. There, you will find a solitary "7".
daj95376
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Re: Challenger Sudoku help

Postby JeJ » Tue Jan 11, 2011 7:43 pm

ARRRGGHHHHH!! I can't believe I didn't see that 7. Sorry for bothering you with such a silly request.
JeJ
 
Posts: 76
Joined: 06 January 2011


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