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Jan 6 VH

 
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roaa



Joined: 18 Apr 2009
Posts: 65
Location: Sweden

PostPosted: Sun Jan 06, 2013 9:12 am    Post subject: Jan 6 VH Reply with quote

I used 3 XY-wings. First (147) with pivot at r4c3 followed by 2 (157) pivoted at r5c9 and r5c5. I got the feeling that the last two can be replaced by another single movement?!
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hughwill



Joined: 05 Apr 2010
Posts: 141
Location: Birmingham UK

PostPosted: Sun Jan 06, 2013 11:54 am    Post subject: Jan 6 VH Reply with quote

After basics:
Code:

+-------------+---------+------------+
| 6    3   8  | 5 9   4 | 17 17  2   |
| 4    2   1  | 7 3   8 | 5  9   6   |
| 5    7   9  | 1 2   6 | 8  3   4   |
+-------------+---------+------------+
| 1378 5   47 | 6 17  2 | 34 178 9   |
| 137  14  2  | 8 157 9 | 34 6   15  |
| 9    18  6  | 4 157 3 | 17 2   158 |
+-------------+---------+------------+
| 18   148 3  | 9 6   5 | 2  48  7   |
| 2    6   5  | 3 48  7 | 9  148 18  |
| 78   9   47 | 2 48  1 | 6  5   3   |
+-------------+---------+------------+



Play this puzzle online at the Daily Sudoku site

After the first two XY wings there is also a 178 pivot r6c7 which ends it.
Colouring on 8s setting r7c8 to 4 will do it in one, but I suspect I'm missing something
simpler.
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Marty R.



Joined: 12 Feb 2006
Posts: 5061
Location: Rochester, NY, USA

PostPosted: Sun Jan 06, 2013 4:28 pm    Post subject: Reply with quote

My two X-Wings were on 158 and 471. I must've missed a third because I finished with an XY-Chain. Clearly a more challenging puzzle than most VHs.
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kuskey



Joined: 10 Dec 2008
Posts: 118
Location: Pembroke, NH

PostPosted: Sun Jan 06, 2013 6:40 pm    Post subject: Jan 6 VH Reply with quote

A couple of different routes:
1. first a 158 XYZ wing pivot at r6c9 giving r6c7<>1, then the 147 XY wing pivot at r4c3 leading to the 157 XY wing pivot at r5c5.

2. First the two XY wings mentioned in 1 followed by a hidden 1 at r4c5 leading to a 147 XY wing pivot at r5c8.
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arkietech



Joined: 31 Jul 2008
Posts: 1686
Location: Northwest Arkansas USA

PostPosted: Sun Jan 06, 2013 8:08 pm    Post subject: Reply with quote

Code:
  *-----------------------------------------------------------*
 | 6     3     8     | 5     9     4     | 17    17    2     |
 | 4     2     1     | 7     3     8     | 5     9     6     |
 | 5     7     9     | 1     2     6     | 8     3     4     |
 |-------------------+-------------------+-------------------|
 | 1378  5     47    | 6     17    2     | 34    178   9     |
 | 137   14    2     | 8     157   9     | 34    6     15    |
 | 9    b18    6     | 4     157   3     | 17    2    d158   |
 |-------------------+-------------------+-------------------|
 | 18   a148   3     | 9     6     5     | 2     4-8   7     |
 | 2     6     5     | 3     48    7     | 9     148  d18    |
 | 78    9     47    | 2     48    1     | 6     5     3     |
 *-----------------------------------------------------------*
skyscraper
8r7c2=r6c2-r6c9=8r8c9 => -8r7c8; stte
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Marty R.



Joined: 12 Feb 2006
Posts: 5061
Location: Rochester, NY, USA

PostPosted: Mon Jan 07, 2013 12:38 am    Post subject: Reply with quote

Quote:
skyscraper
8r7c2=r6c2-r6c9=8r8c9 => -8r7c8; stte


How embarrassing!! Embarassed Laughing
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