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Aug 27 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 112
Location: Sweden
PostPosted: Wed Aug 27, 2014 8:27 am    Post subject: Aug 27 VH Reply with quote
An XY-Wing 147 gives r23c7<>4, which solves it.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Wed Aug 27, 2014 9:28 am    Post subject: Reply with quote
After basics:
Code:

+--------+-----------+--------------+
| 57 2 4 | 57 8    1 | 3    6  9    |
| 57 3 6 | 24 2457 9 | 1458 14 458  |
| 8  1 9 | 3  45   6 | 45   2  7    |
+--------+-----------+--------------+
| 6  7 1 | 24 249  5 | 489  3  2489 |
| 3  4 5 | 79 6    8 | 179  17 2    |
| 2  9 8 | 1  47   3 | 47   5  6    |
+--------+-----------+--------------+
| 1  6 7 | 59 59   4 | 2    8  3    |
| 9  8 3 | 6  1    2 | 457  47 45   |
| 4  5 2 | 8  3    7 | 6    9  1    |
+--------+-----------+--------------+
Play this puzzle online at the Daily Sudoku site
Roaa said:
Quote:
An XY-Wing 147 gives r23c7<>4, which solves it.


...as does the 457 XY-wing pivot r3c5.

Hugh
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