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Feb 27 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed Feb 26, 2014 10:42 pm    Post subject: Feb 27 VH Reply with quote
Code:

+--------------+----------+---------------+
| *14  7   6    | 2  5 3   | *148 18   9    |
| 8   13-9 35   | 69 7 4   | 16  1256 1236 |
| 59-4 2   345  | 69 1 8   | 7   56   346  |
+--------------+----------+---------------+
| 2   5   1    | 8  4 6   | 9   3    7    |
| 7   6   9    | 3  2 1   | 5   4    8    |
| 3   4   8    | 5  9 7   | 2   16   16   |
+--------------+----------+---------------+
| 15-4 138 2345 | 7  6 25  | 18-4 9    124  |
| *49  89  7    | 1  3 29  | *468 268  5    |
| 6   19  25   | 4  8 259 | 3   7    12   |
+--------------+----------+---------------+
X-Wing on 4 in r18c17; r37c1, r7c7<>4 opens
XY-Wing 15-9 pivoted in r7c1; r2c2<>9; stte.
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Clement



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania
PostPosted: Wed Feb 26, 2014 11:23 pm    Post subject: Feb 27 VH Reply with quote
A single stepper is
XY-Wing 49-1 pivoted in r8c1; r2c2<>1.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Thu Feb 27, 2014 1:19 pm    Post subject: Reply with quote
I was originally going to use the X-Wing because I didn't see anything else, but then noticed the 49-1 XY-Wing before using the X-Wing. For some reason the XY was easy to overlook.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Thu Feb 27, 2014 3:53 pm    Post subject: Feb 27 VH Reply with quote
Code:

+-------------+----------+---------------+
| 14 7   6    | 2  5 3   | 148 18   9    |
| 8  139 35   | 69 7 4   | 16  1256 1236 |
| 59 2   345  | 69 1 8   | 7   56   346  |
+-------------+----------+---------------+
| 2  5   1    | 8  4 6   | 9   3    7    |
| 7  6   9    | 3  2 1   | 5   4    8    |
| 3  4   8    | 5  9 7   | 2   16   16   |
+-------------+----------+---------------+
| 15 138 2345 | 7  6 25  | 18  9    124  |
| 49 89  7    | 1  3 29  | 468 268  5    |
| 6  19  25   | 4  8 259 | 3   7    12   |
+-------------+----------+---------------+

Play this puzzle online at the Daily Sudoku site


Funnily enough, I have difficulty seeing the X-Wings and usually see
the XY-Wings more easily. That was the case today but afterwards I saw
that there is another 4 X-Wing (Columns 3 and 9) which opens the same
XY-Wing as in Clement's first post. (In addition it opens a useless 125 XY-
Wing to add to the equally useless 16 W-Wing in columns 7 and 8 ).
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