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Feb 9 VH

 
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Wed Feb 08, 2012 10:55 pm    Post subject: Feb 9 VH Reply with quote

X-Wing on 4 in r36; r2c4<>4 and r78c9<>4 opens a kite on 7 originating from BOX 2; r4c8<>7 solves it.
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Clement



Joined: 24 Apr 2006
Posts: 684
Location: Dar es Salaam Tanzania

PostPosted: Wed Feb 08, 2012 11:29 pm    Post subject: Feb 9 VH Reply with quote

Well, the skyscraper on 7 in col 67; r4c8<>7 is a one stepper solution.
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Thu Feb 09, 2012 5:53 am    Post subject: Reply with quote

First time in ages that I couldn't find a solution using the standard VH steps.

Code:

+-----------+---------------+------------+
| 3   4   6 | 5   27   8    | 1  79  279 |
| 128 18  5 | 149 2479 479  | 47 6   3   |
| 12  7   9 | 14  6    3    | 8  5   24  |
+-----------+---------------+------------+
| 49  3   1 | 6   8    479  | 2  479 5   |
| 49  5   8 | 3   479  2    | 47 1   6   |
| 6   2   7 | 49  1    5    | 3  8   49  |
+-----------+---------------+------------+
| 18  168 3 | 7   49   1469 | 5  2   148 |
| 5   9   2 | 8   3    14   | 6  47  147 |
| 7   168 4 | 2   5    16   | 9  3   18  |
+-----------+---------------+------------+

Play this puzzle online at the Daily Sudoku site
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arkietech



Joined: 31 Jul 2008
Posts: 1727
Location: Northwest Arkansas USA

PostPosted: Thu Feb 09, 2012 11:47 am    Post subject: Reply with quote

Marty R. wrote:
First time in ages that I couldn't find a solution using the standard VH steps.


Very Happy

Code:
after the x-wing
 *-----------------------------------------------------------*
 | 3     4     6     | 5     27    8     | 1     79    29    |
 | 128   18    5     | 19    2479  479   | 47    6     3     |
 | 12    7     9     | 14    6     3     | 8     5     24    |
 |-------------------+-------------------+-------------------|
 | 4-9   3     1     | 6     8     479   | 2    *79    5     |
 |*49    5     8     | 3     479   2     |*47    1     6     |
 | 6     2     7     | 49    1     5     | 3     8     49    |
 |-------------------+-------------------+-------------------|
 | 18    6     3     | 7     49    49    | 5     2     18    |
 | 5     9     2     | 8     3     1     | 6     4     7     |
 | 7     18    4     | 2     5     6     | 9     3     18    |
 *-----------------------------------------------------------*
xy-wing
 
 *-----------------------------------------------------------*
 | 3     4     6     | 5     27    8     | 1     79    29    |
 | 128   18    5     | 19    2479  479   | 47    6     3     |
 | 12    7     9     | 14    6     3     | 8     5     24    |
 |-------------------+-------------------+-------------------|
 | 4     3     1     | 6     8    *79    | 2     79    5     |
 | 9     5     8     | 3    *47    2     | 47    1     6     |
 | 6     2     7     | 49    1     5     | 3     8     49    |
 |-------------------+-------------------+-------------------|
 | 18    6     3     | 7    *49    4-9   | 5     2     18    |
 | 5     9     2     | 8     3     1     | 6     4     7     |
 | 7     18    4     | 2     5     6     | 9     3     18    |
 *-----------------------------------------------------------*
xy-wing
 
 *--------------------------------------------------*
 | 3    4    6    | 5   *27   8    | 1    79   29   |
 | 128  18   5    | 19  *247  9-7  |*47   6    3    |
 | 12   7    9    | 14   6    3    | 8    5    24   |
 |----------------+----------------+----------------|
 | 4    3    1    | 6    8    79   | 2    79   5    |
 | 9    5    8    | 3    47   2    | 47   1    6    |
 | 6    2    7    | 49   1    5    | 3    8    49   |
 |----------------+----------------+----------------|
 | 18   6    3    | 7    9    4    | 5    2    18   |
 | 5    9    2    | 8    3    1    | 6    4    7    |
 | 7    18   4    | 2    5    6    | 9    3    18   |
 *--------------------------------------------------*
xyz-wing
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Marty R.



Joined: 12 Feb 2006
Posts: 5164
Location: Rochester, NY, USA

PostPosted: Thu Feb 09, 2012 4:17 pm    Post subject: Reply with quote

Thanks Dan. After the X-Wing I played two XY-Wings and was looking at a BUG+2. Should have tried again but I thought I'd end up with the same result.
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keith



Joined: 19 Sep 2005
Posts: 3179
Location: near Detroit, Michigan, USA

PostPosted: Tue Feb 14, 2012 1:44 pm    Post subject: Reply with quote

After the X-wing, a DP 18 sets R2C1=2.

Keith
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