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Jan 19 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Tue Jan 19, 2016 8:08 am    Post subject: Jan 19 VH Reply with quote

XY-wing 156, pivot r5c4, solves it.
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Tue Jan 19, 2016 6:16 pm    Post subject: Jan 19 VH Reply with quote

After basics:
Code:

+--------------+-----------+-------------+
| 6  2    9    | 13 34  7  | 14  8    5  |
| 4  78   78   | 16 2   5  | 3   16   9  |
| 1  35   35   | 9  8   46 | 7   46   2  |
+--------------+-----------+-------------+
| 5  6    347  | 2  47  1  | 8   9    37 |
| 2  3478 3478 | 56 9   34 | 156 15   37 |
| 37 9    137  | 8  57  36 | 156 2    4  |
+--------------+-----------+-------------+
| 8  3457 3457 | 35 6   9  | 2   3457 1  |
| 37 1357 2    | 4  135 8  | 9   357  6  |
| 9  1345 6    | 7  135 2  | 45  345  8  |
+--------------+-----------+-------------+

Play this puzzle online at the Daily Sudoku site

The XY wing can also pivot at r2c8. The 47-3 XYwing leads nowhere.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Jan 19, 2016 8:37 pm    Post subject: Reply with quote

Quote:
The XY wing can also pivot at r2c8.


Hugh, I can't see it.
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dongrave



Joined: 06 Mar 2014
Posts: 563

PostPosted: Tue Jan 19, 2016 11:33 pm    Post subject: Reply with quote

He just got the pivot wrong Marty. The pivot is actually at r5c8; not r2c8 which is one reason why I prefer your designation of the XY wings in this case as XY 56-1 (with pivot at r5c4) and XY 15-6 (with pivot at r5c8) because it avoids confusion when you accidentally list the cell of a pincer instead of the pivot. (Obviously the 1-6 cells can't be the pivots.)
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Jan 20, 2016 2:12 am    Post subject: Reply with quote

Good catch Don. Designating the wing as XY-Z was Keith's suggestion and an excellent one it was.
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Wed Jan 20, 2016 10:25 am    Post subject: Reply with quote

dongrave wrote:
He just got the pivot wrong Marty. The pivot is actually at r5c8


Embarassed Entirely correct of course.
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