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Jun 16 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Tue Jun 16, 2015 9:38 am    Post subject: Jun 16 VH Reply with quote
After basics:

Code:

+-------------+-------------+-----------+
| 7   3    2  | 189  6   4  | 5  19 18  |
| 5   49   8  | 129  123 7  | 24 6  13  |
| 469 469  1  | 5    238 39 | 24 79 378 |
+-------------+-------------+-----------+
| 3   18   9  | 78   5   2  | 6  4  17  |
| 128 158  4  | 3    78  6  | 9  17 25  |
| 26  7    56 | 4    9   1  | 8  3  25  |
+-------------+-------------+-----------+
| 169 169  67 | 1279 127 5  | 3  8  4   |
| 14  2    3  | 6    14  8  | 7  5  9   |
| 489 4589 57 | 79   347 39 | 1  2  6   |
+-------------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site
Back to one step again today:
Quote:
178 XY-Wing pivot r4c9 - r3c5=8
Hugh
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Tue Jun 16, 2015 4:01 pm    Post subject: Reply with quote
Quote:
178 XY-Wing pivot r4c9 - r3c5=8


Hugh, maybe that happens after a few moves, but the only elimination that I can see is -8ric4.
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dongrave



Joined: 06 Mar 2014
Posts: 568
PostPosted: Wed Jun 17, 2015 10:13 pm    Post subject: Reply with quote
I think Marty's right that the only 'direct' result of the XY wing is the elimination of the 8 from r1c4 - but that does immediately leave r3c5 with the only remaining 8 in box 2.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Jun 18, 2015 5:38 am    Post subject: Reply with quote
dongrave wrote:
I think Marty's right that the only 'direct' result of the XY wing is the elimination of the 8 from r1c4 - but that does immediately leave r3c5 with the only remaining 8 in box 2.

It does indeed leave one 8 in box 2. I hate to sound petty and technical, but things might be more understandable if we standardize the way we report the result of a move. The whole idea of pincers is to preclude the number from any cell that sees both pincers. In this case, a subsequent result might be some cell = 4, but the reader can more readily see what's happening when the direct result of the move is posted.
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