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Jan 18 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Jan 18, 2017 6:05 am    Post subject: Jan 18 VH Reply with quote
Code:

+-----------+---------+-----------+
| 6  4   9  | 2  3  5 | 1   8 7   |
| 8  2   7  | 6  9  1 | 4   3 5   |
| 5  1   3  | 4  7  8 | 9   2 6   |
+-----------+---------+-----------+
| 7  5   4  | 8  2  6 | 3   9 1   |
| 13 38  2  | 9  14 7 | 6   5 48  |
| 9  6   18 | 5  14 3 | 28  7 248 |
+-----------+---------+-----------+
| 4  378 18 | 17 58 9 | 258 6 238 |
| 2  89  5  | 3  6  4 | 7   1 89  |
| 13 379 6  | 17 58 2 | 58  4 39  |
+-----------+---------+-----------+

Play this puzzle online at the Daily Sudoku site

Quote:
X-Wing (8) r58=> -8r7c29 exposes an XYZ-Wing (379) hinged in r9c2=> -3 r9c1
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Jan 18, 2017 11:26 am    Post subject: Jan 18 VH Reply with quote
Couldn't see the X wing for the life of me. But there's also an alternative
13-7 XY wing to see it off (pivot r9c1)
Hugh
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Earl



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Wed Jan 18, 2017 2:26 pm    Post subject: Jan 18 VH Reply with quote
unique rectangle 58(R79,C57); R7C7 = 2

Early Earl
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
PostPosted: Wed Jan 18, 2017 4:53 pm    Post subject: XY chain? Reply with quote
pivoting at r9c1 creates wings (of 9) at r9c9 and r8c2 so r8c9 <>9
Is this what is described as an xy chain or what?
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Wed Jan 18, 2017 9:30 pm    Post subject: Reply with quote
George,

Yes. This is a short XY chain, but you did not mention using R7C3.

Code:
+-----------+---------+-----------+
| 6  4   9  | 2  3  5 | 1   8 7   |
| 8  2   7  | 6  9  1 | 4   3 5   |
| 5  1   3  | 4  7  8 | 9   2 6   |
+-----------+---------+-----------+
| 7  5   4  | 8  2  6 | 3   9 1   |
| 13 38  2  | 9  14 7 | 6   5 48  |
| 9  6   18 | 5  14 3 | 28  7 248 |
+-----------+---------+-----------+
| 4  378 18c| 17 58 9 | 258 6 238 |
| 2  89d 5  | 3  6  4 | 7   1 8-9 |
|13b 379 6  | 17 58 2 | 58  4 39a |
+-----------+---------+-----------+


If a is 3 ...
The X-wing on 8 is in R58.

Keith
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