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Dec 21 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Tue Dec 20, 2016 10:21 pm    Post subject: Dec 21 VH Reply with quote
Code:

+-----------+-------------+-----------+
| 7   1   6 | 28  238  4  | 9 358 358 |
| 359 59  2 | 1   3789 89 | 6 378 4   |
| 39  4   8 | 67  3679 5  | 1 37  2   |
+-----------+-------------+-----------+
| 89-5 569^ 4 | 68  1    3  | 7 2   59*  |
| 28  56*  3 | 9   28   7  | 4 56  1   |
| 29  7   1 | 5   4    26 | 8 369 39  |
+-----------+-------------+-----------+
| 4   8   5 | 3   69   69 | 2 1   7   |
| 6   2   7 | 4   5    1  | 3 89  89  |
| 1   3   9 | 278 278  28 | 5 4   6   |
+-----------+-------------+-----------+

XYZ-W 569-5 apex in r4c2; r4c1 <> 5; stte
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Wed Dec 21, 2016 6:16 am    Post subject: Reply with quote
There is also an XY-wing 26-8 in C46 that does not solve the puzzle.

Keith
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Dec 21, 2016 11:07 am    Post subject: 21 Dec VH Reply with quote
Code:

+-----------+-------------+-----------+
| 7   1   6 | 28  238  4  | 9 358 358 |
| 359 59  2 | 1   3789 89 | 6 378 4   |
| 39  4   8 | 67  3679 5  | 1 37  2   |
+-----------+-------------+-----------+
| 589 569 4 | 68  1    3  | 7 2   59  |
| 28  56  3 | 9   28   7  | 4 56  1   |
| 29  7   1 | 5   4    26 | 8 369 39  |
+-----------+-------------+-----------+
| 4   8   5 | 3   69   69 | 2 1   7   |
| 6   2   7 | 4   5    1  | 3 89  89  |
| 1   3   9 | 278 278  28 | 5 4   6   |
+-----------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

There's a W(?) Wing on 59s with strong link on 5s in r5 removing 9 from
r4c3: stte.
Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Wed Dec 21, 2016 6:44 pm    Post subject: Reply with quote
Quote:
There's a W(?) Wing on 59s


Hugh, with regard to the question mark, yes, it's a W-Wing.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Dec 21, 2016 8:13 pm    Post subject: Reply with quote
Marty R. wrote:
Quote:
There's a W(?) Wing on 59s


Hugh, with regard to the question mark, yes, it's a W-Wing.

Thanks Marty- looked more like a U-wing to me, or even a 90 degree rotated
C-wing. Even I know those don't exist! Very Happy
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Dec 22, 2016 3:45 am    Post subject: Reply with quote
hughwill wrote:
Marty R. wrote:
Quote:
There's a W(?) Wing on 59s


Hugh, with regard to the question mark, yes, it's a W-Wing.

Thanks Marty- looked more like a U-wing to me, or even a 90 degree rotated
C-wing. Even I know those don't exist! Very Happy



It isn't named for its shape. Keith named it in honor of George Woods, who was the first to bring the pattern to the attention of the forum.
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Thu Dec 22, 2016 10:37 am    Post subject: Reply with quote
Marty R. wrote:
hughwill wrote:
Marty R. wrote:
Quote:
There's a W(?) Wing on 59s


Hugh, with regard to the question mark, yes, it's a W-Wing.

Thanks Marty- looked more like a U-wing to me, or even a 90 degree rotated
C-wing. Even I know those don't exist! Very Happy



It isn't named for its shape. Keith named it in honor of George Woods, who was the first to bring the pattern to the attention of the forum.

Yes,

George Woods, who is still a frequent contributor here, posted some solutions. I took the trouble to write the method down, and called it a W-wing in George's honor.

And, similarly for an M-wing. It is the simplest case of Medusa Coloring, and also happens to be the first letter of my last name.

My original thread on this topic is here:

http://www.dailysudoku.co.uk/sudoku/forums/viewtopic.php?t=2143

Keith
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