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Sep 16 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Sat Sep 15, 2012 10:22 pm    Post subject: Sep 16 VH Reply with quote
Code:

+---------+--------------+------------+
| 3 4  8  | 25   9   6   | 27   57 1  |
| 9 5  2  | 7    3   1   | 4    8  6  |
| 6 1  7  | 8    25  4   | 239  59 23 |
+---------+--------------+------------+
| 8 3  6  | 29   1   7   | 29   4  5  |
| 1 29 45 | 6    24-5 8   | 23-79 79 23 |
| 7 29 45 | 2359 24-5 239 | 1    6  8  |
+---------+--------------+------------+
| 4 8  39 | 1    6   39  | 5    2  7  |
| 2 7  39 | 349  8   5   | 6    1  49 |
| 5 6  1  | 249  7   29  | 8    3  49 |
+---------+--------------+------------+
XY-Wing 27 29 79 pivoted in r4c7; r5c7<>7 solves it.
Also Type 4 UR 45 in 35; r56c5<>5.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Sep 16, 2012 1:04 am    Post subject: Reply with quote
I used the 239 XYZ-Wing pivoted in r3c7.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Sun Sep 16, 2012 11:37 am    Post subject: Sep 16 VH Reply with quote
Code:

+---------+---------------+------------+
| 3 4  8  | 25    9   6   | 27   57 1  |
| 9 5  2  | 7     3   1   | 4    8  6  |
| 6 1  7  | 8     25  4   | 239  59 23 |
+---------+---------------+------------+
| 8 3  6  | 29    1   7   | 29   4  5  |
| 1 29 45 | 6     245 8   | 2379 79 23 |
| 7 29 45 | 23459 245 239 | 1    6  8  |
+---------+---------------+------------+
| 4 8  39 | 1     6   39  | 5    2  7  |
| 2 7  39 | 349   8   5   | 6    1  49 |
| 5 6  1  | 249   7   29  | 8    3  49 |
+---------+---------------+------------+

Play this puzzle online at the Daily Sudoku site

There's an X wing on 2s Rs 1 and 4 which removes 2s in r3c7, r5c7 and r6c4.
This exposes double 239 XY wings pivoted on r3c7 or r4c7 either of which
does the trick. I thought this was a nice puzzle.
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