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May 09 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden

PostPosted: Mon May 09, 2016 9:22 am    Post subject: May 09 VH Reply with quote

Several XY-wings. Found a one-stepper: 239, pivot r1c2 => r45c3<>9. May be there are others!
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK

PostPosted: Mon May 09, 2016 12:09 pm    Post subject: Re: May 09 VH Reply with quote

roaa wrote:
Several XY-wings. Found a one-stepper: 239, pivot r1c2 => r45c3<>9. May be there are others!


After basics:
Code:

+--------------+---------+---------------+
| 1    23 7    | 5  9  4 | 8    6   23   |
| 29   6  5    | 8  23 7 | 1    4   239  |
| 8    4  39   | 1  23 6 | 357  35  2379 |
+--------------+---------+---------------+
| 2469 8  469  | 24 7  3 | 69   1   5    |
| 7    29 469  | 24 1  5 | 369  39  8    |
| 3    5  1    | 9  6  8 | 47   2   47   |
+--------------+---------+---------------+
| 469  39 3469 | 7  5  2 | 49   8   1    |
| 45   1  2    | 6  8  9 | 345  7   34   |
| 59   7  8    | 3  4  1 | 2    59  6    |
+--------------+---------+---------------+

Play this puzzle online at the Daily Sudoku site

Yes- two of the four 239 XY-Wings appear to do it in 1 but not
the ones pivoted at r2c1 or r3c3. In fact the two that solve it both
pivot in r1c2. It also looks as though there should be W wings as well
but I lost interest before finding any. But for a nice chain how about
If r3c8<>3 r9c8=9 r7c7=4 r8c8=3. So by elimination r123c9<>3 stte.


Last edited by hughwill on Mon May 09, 2016 10:29 pm; edited 2 times in total
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Mon May 09, 2016 1:17 pm    Post subject: Reply with quote

Skyscraper : {9C28} -> r9c8=9; stte
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