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Sep 16 VH

 
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hughwill



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

PostPosted: Mon Sep 15, 2014 7:59 pm    Post subject: Sep 16 VH Reply with quote

After basics:

Code:

+-------------+--------------+--------------+
| 7  3    1   | 268  9  28   | 2568 4   258 |
| 4  26   8   | 1    5  237  | 236  9   27  |
| 5  9    26  | 4    36 2378 | 2368 1   278 |
+-------------+--------------+--------------+
| 2  4568 46  | 3    47 1    | 9    57  568 |
| 1  56   7   | 259  8  259  | 4    3   256 |
| 3  458  9   | 25   47 6    | 258  257 1   |
+-------------+--------------+--------------+
| 69 7    23  | 5689 36 3589 | 1    25  4   |
| 69 1    5   | 69   2  4    | 7    8   3   |
| 8  24   234 | 7    1  35   | 25   6   9   |
+-------------+--------------+--------------+

Play this puzzle online at the Daily Sudoku site

A standard solution:
Quote:
236 XY wing (a 'double')

sorts it out.
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Jeff



Joined: 06 May 2007
Posts: 46

PostPosted: Fri Sep 19, 2014 4:33 pm    Post subject: Reply with quote

Could you tell me what "xy wing (a double)" is. I am familiar with an xy wing, but don't know what "a double" indicates. I ended up with the grid you show, but can't seem to get further. Many thanks,
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hughwill



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

PostPosted: Fri Sep 19, 2014 4:46 pm    Post subject: Sep 16 VH Reply with quote

Jeff said
Quote:
I am familiar with an xy wing, but don't know what "a double" indicates.


There are two linked 236 XY-Wings - either r7c3-pivot on r3c3 and r3c5
leading to removal of the 3 in r7c5, or r7c5-pivot on r7c3 and r3c3 leading to
removal of 6 in r3c5. These pairs come up when the two 'solved' elements are
the same pair - in this case 36. It seems to be quite common in these puzzles.
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Jeff



Joined: 06 May 2007
Posts: 46

PostPosted: Fri Sep 19, 2014 6:12 pm    Post subject: Reply with quote

I can't believe that I didn't see that. Thanks.
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