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Oct. 31 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Wed Oct 31, 2012 4:42 am    Post subject: Oct. 31 VH Reply with quote

Code:

+-----------+------------+---------------+
| 48 1468 3 | 789 5   69 | 2    147 78   |
| 5  18   2 | 3   78  4  | 9    17  6    |
| 7  468  9 | 1   28  26 | 458  3   58   |
+-----------+------------+---------------+
| 3  258  6 | 789 4   29 | 1    57  2578 |
| 48 248  7 | 6   1   5  | 38   9   238  |
| 9  258  1 | 78  278 3  | 578  6   4    |
+-----------+------------+---------------+
| 2  9    4 | 5   3   7  | 6    8   1    |
| 1  37   5 | 4   6   8  | 37   2   9    |
| 6  37   8 | 2   9   1  | 3457 457 357  |
+-----------+------------+---------------+

Play this puzzle online at the Daily Sudoku site

I'm stuck. Oh, I can solve the puzzle, but I can't see any of the standard VH moves, i.e., X-, XY- or XYZ-Wing. There has to be at least one in there unless Sam is playing some kind of Halloween trick. Wink
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arkietech



Joined: 31 Jul 2008
Posts: 1717
Location: Northwest Arkansas USA

PostPosted: Wed Oct 31, 2012 6:43 am    Post subject: Reply with quote

Code:
 *-----------------------------------------------------------*
 | 4-8   146-8 3     | 789   5     69    | 2     147  a78    |
 | 5    c18    2     | 3     78    4     | 9    b17    6     |
 | 7     468   9     | 1     28    26    | 458   3     58    |
 |-------------------+-------------------+-------------------|
 | 3     258   6     | 789   4     29    | 1     57    2578  |
 | 48    248   7     | 6     1     5     | 38    9     238   |
 | 9     258   1     | 78    278   3     | 578   6     4     |
 |-------------------+-------------------+-------------------|
 | 2     9     4     | 5     3     7     | 6     8     1     |
 | 1     37    5     | 4     6     8     | 37    2     9     |
 | 6     37    8     | 2     9     1     | 3457  457   357   |
 *-----------------------------------------------------------*
xy-wing
(8=7)r1c9-(7=1)r2c8-(1=8)r2c2 => -8r1c12; stte
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George Woods



Joined: 28 Mar 2006
Posts: 232
Location: Dorset UK

PostPosted: Wed Oct 31, 2012 9:36 am    Post subject: Is this a perverse solution almost an Xy wing? Reply with quote

r1c8 is either 7 or not. If not than xy wing 148 pivoted in r1c1 makes r2c8 7 Aliter r1c8 is 7 so r1c9 cannot be 7 and this solves it.
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Marty R.



Joined: 12 Feb 2006
Posts: 5160
Location: Rochester, NY, USA

PostPosted: Wed Oct 31, 2012 3:21 pm    Post subject: Reply with quote

Quote:
xy-wing
(8=7)r1c9-(7=1)r2c8-(1=8)r2c2 => -8r1c12; stte


ARRRGH!! Embarassed Crying or Very sad
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