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Sep 30 VH

 
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hughwill



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

PostPosted: Tue Sep 30, 2014 9:56 am    Post subject: Sep 30 VH Reply with quote

After Basics:

Code:

+------------+--------------+---------+
| 239 1  5   | 2369 69  7   | 8 26 4  |
| 4   6  23  | 1    8   23  | 9 5  7  |
| 279 79 8   | 269  4   5   | 1 26 3  |
+------------+--------------+---------+
| 6   35 7   | 4    59  39  | 2 1  8  |
| 1   4  29  | 8    569 269 | 7 3  59 |
| 235 8  239 | 239  7   1   | 6 4  59 |
+------------+--------------+---------+
| 59  59 1   | 7    2   4   | 3 8  6  |
| 8   2  4   | 69   3   69  | 5 7  1  |
| 37  37 6   | 5    1   8   | 4 9  2  |
+------------+--------------+---------+

Play this puzzle online at the Daily Sudoku site

I needed 3 standard VH moves for this: X-Wing on 2 r35, 359 XY-Wing
pivot r4c2 and finally XY-wing 239 pivot r6c3 to set it. Haven't looked for
quicker ways but I'll be amazed if no one else comes up with one.....

Hugh
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA

PostPosted: Tue Sep 30, 2014 12:05 pm    Post subject: Reply with quote

Hugh,

look at 9's in row 4

then a skyscraper 3 removes a 3 in r6c3 then singles

for vh look for an xyz-wing 239 in r56c3 and r6c4
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hughwill



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

PostPosted: Tue Sep 30, 2014 1:42 pm    Post subject: Reply with quote

arkietech wrote:
Hugh,

look at 9's in row 4

then a skyscraper 3 removes a 3 in r6c3 then singles

for vh look for an xyz-wing 239 in r56c3 and r6c4



oops.... Embarassed
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK

PostPosted: Wed Oct 01, 2014 11:20 am    Post subject: another 2 step solution? Reply with quote

The X wing removes the 2 from r6c3 to give a w wing 39 operating on 9s in row 5 to eliminate 3 at r6c4 giving a 3 at r4c2 ......
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keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA

PostPosted: Wed Oct 01, 2014 12:50 pm    Post subject: Reply with quote

Code:
+----------------+----------------+----------------+
| 239  1    5    | 2369 69   7    | 8    26   4    |
| 4    6    23   | 1    8    23   | 9    5    7    |
| 279  79   8    | 269  4    5    | 1    26   3    |
+----------------+----------------+----------------+
| 6    35   7    | 4    59   39   | 2    1    8    |
| 1    4    29   | 8    56   26   | 7    3    59   |
| 235  8    239  | 23   7    1    | 6    4    59   |
+----------------+----------------+----------------+
| 59   59   1    | 7    2    4    | 3    8    6    |
| 8    2    4    | 69   3    69   | 5    7    1    |
| 37   37   6    | 5    1    8    | 4    9    2    |
+----------------+----------------+----------------+
There are two XYZ-wings. Look at r6b4. One takes out 3 in r6c3, the other takes out 2 in r6c1. Either solves the puzzle,

Keith
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vanessamanda



Joined: 10 Oct 2014
Posts: 1

PostPosted: Fri Oct 10, 2014 12:53 am    Post subject: So hard Reply with quote

I think you should give us the original puzzle so that we can discuss about the answer. Look at your code, I cannot give any solution.
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