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Aug 18 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 422
Location: Birmingham UK

PostPosted: Tue Aug 18, 2015 9:56 am    Post subject: Aug 18 VH Reply with quote

Given the number of posts recently I'm surprised no one has posted on
this one yet......

Er...After Basics:

Code:

+------------+-------+-------------+
| 5  2   18  | 9 4 7 | 18  6   3   |
| 3  7   14  | 6 5 8 | 14  2   9   |
| 6  48  9   | 3 1 2 | 458 7   58  |
+------------+-------+-------------+
| 7  148 468 | 2 9 5 | 3   148 168 |
| 19 3   56  | 8 7 4 | 2   19  156 |
| 89 458 2   | 1 3 6 | 58  489 7   |
+------------+-------+-------------+
| 2  158 58  | 4 6 9 | 7   3   18  |
| 18 9   7   | 5 2 3 | 6   18  4   |
| 4  6   3   | 7 8 1 | 9   5   2   |
+------------+-------+-------------+

Play this puzzle online at the Daily Sudoku site

I found:
Quote:
An X wing on 1 opening a 49-8 XYZ wing pivot r6c8 so r6c7=5
Couldn't see a one stepper based on the usual VH wings
but I suspect there are several W wings, chains etc....
but I'm off for another coffee rather than hunting them down.

Hugh
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danw



Joined: 31 Jul 2012
Posts: 16
Location: Phoenixville, PA USA

PostPosted: Tue Aug 18, 2015 1:07 pm    Post subject: Reply with quote

Found the same as Hugh and had a lot of fun as usual. I see that Hugh's basics are not quite complete, he did not eliminate the 1 from r5c9 that is key to the solution we both found. Like Hugh I believe someone else will come up with a one stepper.

cheers,

DanW
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bat999



Joined: 09 Jul 2015
Posts: 55
Location: UK

PostPosted: Tue Aug 18, 2015 1:50 pm    Post subject: Reply with quote

Code:
.----------------.---------.-----------------.
| 5    2     18  | 9  4  7 |  18   6     3   |
| 3    7     14  | 6  5  8 |  14   2     9   |
| 6   d48    9   | 3  1  2 | b458  7    a58  |
:----------------+---------+-----------------:
| 7   d148   468 | 2  9  5 |  3    148   168 |
| 19   3     56  | 8  7  4 |  2    19    56  |
| 89  d458   2   | 1  3  6 | c58   489   7   |
:--------------+-----------+-----------------:
| 2   e158  e58  | 4  6  9 |  7    3     1-8 |
| 18   9     7   | 5  2  3 |  6    18    4   |
| 4    6     3   | 7  8  1 |  9    5     2   |
'----------------'---------'-----------------'
(8=5)r3c9 - r3c7 = r6c7 - (5=481)r356c2 - (1=58)r7c23 => -8 r7c9; stte
Cool
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JC Van Hay



Joined: 13 Jun 2010
Posts: 494
Location: Charleroi, Belgium

PostPosted: Tue Aug 18, 2015 2:16 pm    Post subject: Reply with quote

Code:
+----------------+---------+-----------------+
| 5     2    18  | 9  4  7 | 18   6      3   |
| 3     7    14  | 6  5  8 | 14   2      9   |
| 6     48   9   | 3  1  2 | 458  7      58  |
+----------------+---------+-----------------+
| 7     148  468 | 2  9  5 | 3    14(8)  168 |
| 19    3    56  | 8  7  4 | 2    19     56  |
| 9(8)  458  2   | 1  3  6 | 5-8  49(8)  7   |
+----------------+---------+-----------------+
| 2     158  58  | 4  6  9 | 7    3      18  |
| 1(8)  9    7   | 5  2  3 | 6    1(8)   4   |
| 4     6    3   | 7  8  1 | 9    5      2   |
+----------------+---------+-----------------+
The solutions of 8C18 exclude 8r6c7; stte
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Aug 18, 2015 11:49 pm    Post subject: Reply with quote

JC Van Hay wrote:
Code:
+----------------+---------+-----------------+
| 5     2    18  | 9  4  7 | 18   6      3   |
| 3     7    14  | 6  5  8 | 14   2      9   |
| 6     48   9   | 3  1  2 | 458  7      58  |
+----------------+---------+-----------------+
| 7     148  468 | 2  9  5 | 3    14(8)  168 |
| 19    3    56  | 8  7  4 | 2    19     56  |
| 9(8)  458  2   | 1  3  6 | 5-8  49(8)  7   |
+----------------+---------+-----------------+
| 2     158  58  | 4  6  9 | 7    3      18  |
| 1(8)  9    7   | 5  2  3 | 6    1(8)   4   |
| 4     6    3   | 7  8  1 | 9    5      2   |
+----------------+---------+-----------------+
The solutions of 8C18 exclude 8r6c7; stte


JC played a Finned X-Wing without specifying the technique.
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rmireland



Joined: 21 Sep 2013
Posts: 33
Location: New Orleans

PostPosted: Wed Aug 19, 2015 3:34 pm    Post subject: Reply with quote

I don't know what to call it, but the 58 pairs in r3c9 and r7c3 (acting as pincers) are linked together by the 56 pairs in r5c39 (acting as the pivot), so -8r7c9. It works like an XY wing, but the pivot is a pair of cells instead of a single cell.
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Wed Aug 19, 2015 11:42 pm    Post subject: Reply with quote

rmireland wrote:
I don't know what to call it, but the 58 pairs in r3c9 and r7c3 (acting as pincers) are linked together by the 56 pairs in r5c39 (acting as the pivot), so -8r7c9. It works like an XY wing, but the pivot is a pair of cells instead of a single cell.


Good find. What you have there is a W-Wing. The strong link on 5 in r5 proves that one or the other of r3c9 and r7c3 must be=8.
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