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May 10 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden
PostPosted: Sat May 10, 2014 9:18 am    Post subject: May 10 VH Reply with quote
An xy-wing 178 gives r9c8=8, leading to an one-step solution.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Sat May 10, 2014 9:58 am    Post subject: May 10 VH Reply with quote
Code:

+----------+-------------+-----------+
| 14 14  6 | 78  3   27  | 28 9  5   |
| 2  8   7 | 5   9   4   | 1  3  6   |
| 5  3   9 | 178 127 6   | 4  78 27  |
+----------+-------------+-----------+
| 6  149 5 | 3   14  8   | 7  2  49  |
| 8  149 3 | 6   27  27  | 5  1  49  |
| 14 7   2 | 9   145 15  | 3  6  8   |
+----------+-------------+-----------+
| 3  6   8 | 2   157 157 | 9  4  17  |
| 7  2   1 | 4   8   9   | 6  5  3   |
| 9  5   4 | 17  6   3   | 28 78 127 |
+----------+-------------+-----------+

Play this puzzle online at the Daily Sudoku site

A 78 W-Wing also does the trick setting r9c4 to 1. The useful looking
49 UR fails to break it, though.
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