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roaa
Joined: 18 Apr 2009 Posts: 112 Location: Sweden
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Posted: Tue Jan 19, 2016 8:08 am Post subject: Jan 19 VH |
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XY-wing 156, pivot r5c4, solves it. |
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hughwill
Joined: 05 Apr 2010 Posts: 424 Location: Birmingham UK
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Posted: Tue Jan 19, 2016 6:16 pm Post subject: Jan 19 VH |
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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 |
+--------------+-----------+-------------+
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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
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Posted: Tue Jan 19, 2016 8:37 pm Post subject: |
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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: 568
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Posted: Tue Jan 19, 2016 11:33 pm Post subject: |
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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
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Posted: Wed Jan 20, 2016 2:12 am Post subject: |
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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: 424 Location: Birmingham UK
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Posted: Wed Jan 20, 2016 10:25 am Post subject: |
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dongrave wrote: | He just got the pivot wrong Marty. The pivot is actually at r5c8 |
Entirely correct of course. |
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