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Nov 26 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 686
Location: Dar es Salaam Tanzania

PostPosted: Fri Nov 25, 2011 10:22 pm    Post subject: Nov 26 VH Reply with quote

XY-Wing 29 23 39 pivoted in r5c6; r4c2<>9 solves it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5180
Location: Rochester, NY, USA

PostPosted: Sat Nov 26, 2011 1:46 am    Post subject: Reply with quote

With my usual reluctance, it solved with basics, both with pencil and paper and then on Draw/Play.
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arkietech



Joined: 31 Jul 2008
Posts: 1733
Location: Northwest Arkansas USA

PostPosted: Sat Nov 26, 2011 10:09 am    Post subject: Reply with quote

I got here with basics. I see a 23 w-wing
Code:
 
 *--------------------------------------------------*
 | 1    379  39   | 5    8    24   | 6    23   47   |
 | 5    37   8    | 24   6    1    | 9    23   47   |
 | 2    4    6    | 3    7    9    | 1    8    5    |
 |----------------+----------------+----------------|
 | 6    39   5    | 29   4    8    | 7    1    239  |
 | 7    1    39   | 6    5    23   | 8    4    239  |
 | 4    8    2    | 79   1    37   | 5    6    39   |
 |----------------+----------------+----------------|
 | 3    6    7    | 1    2    5    | 4    9    8    |
 | 8    2    1    | 47   9    47   | 3    5    6    |
 | 9    5    4    | 8    3    6    | 2    7    1    |
 *--------------------------------------------------*
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Clement



Joined: 24 Apr 2006
Posts: 686
Location: Dar es Salaam Tanzania

PostPosted: Sat Nov 26, 2011 2:21 pm    Post subject: Nov 26 VH Reply with quote

Marty R. wrote:
With my usual reluctance, it solved with basics, both with pencil and paper and then on Draw/Play.
After the basics I have the same Grid as shown by arkietech above. I can't see more eliminations by using basics only. I might not be seeing the obvious.
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Marty R.



Joined: 12 Feb 2006
Posts: 5180
Location: Rochester, NY, USA

PostPosted: Sat Nov 26, 2011 5:02 pm    Post subject: Reply with quote

OK, on try #3 basics didn't do it. XY-Wing (293); r5c3<>3.

One frustrating thing about Sudoku is that one often can't learn from his mistakes because I have no idea what I did wrong the first two times.
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