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Feb 12 VH

 
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hughwill



Joined: 05 Apr 2010
Posts: 413
Location: Birmingham UK

PostPosted: Fri Feb 12, 2016 10:45 am    Post subject: Feb 12 VH Reply with quote

Code:

+--------------+---------------+---------+
| 5    126 4   | 126   8   12  | 9  7  3 |
| 267  3   126 | 12679 269 4   | 26 5  8 |
| 8    267 9   | 5     236 237 | 26 4  1 |
+--------------+---------------+---------+
| 469  146 16  | 3     7   19  | 8  2  5 |
| 2379 27  5   | 4     29  8   | 1  39 6 |
| 239  8   123 | 129   5   6   | 4  39 7 |
+--------------+---------------+---------+
| 1    9   7   | 26    236 23  | 5  8  4 |
| 234  24  23  | 8     1   5   | 7  6  9 |
| 6    5   8   | 79    4   79  | 3  1  2 |
+--------------+---------------+---------+

Play this puzzle online at the Daily Sudoku site

I can't do it in less than 3:

The X-Wing on 1 in rows 2 and 6 and the 19-2 XY wing pivot r4c6
appear to be able to be done in either order. They are needed to open
the
Quote:
69-2 XY-wing pivot r1c4
which finally settles its hash. Strangely, the cell solved by the X wing (r4c3)
is irrelevant to breaking the puzzle....

Hugh
(edited for mistake in X wing row)


Last edited by hughwill on Fri Feb 12, 2016 1:29 pm; edited 1 time in total
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yeoks



Joined: 16 May 2010
Posts: 33

PostPosted: Fri Feb 12, 2016 12:10 pm    Post subject: Reply with quote

My after basics
Code:

+---------------+---------------+---------+
| 5    126 4    | 126   8   12  | 9  7  3 |
| 267  3   1267 | 12679 269 4   | 26 5  8 |
| 8    267 9    | 5     236 237 | 26 4  1 |
+---------------+---------------+---------+
| 469  146 16   | 3     7   19  | 8  2  5 |
| 2379 27  5    | 4     29  8   | 1  39 6 |
| 239  8   123  | 129   5   6   | 4  39 7 |
+---------------+---------------+---------+
| 1    9   67   | 267   236 237 | 5  8  4 |
| 234  24  23   | 8     1   5   | 7  6  9 |
| 67   5   8    | 679   4   79  | 3  1  2 |
+---------------+---------------+---------+

Play this puzzle online at the Daily Sudoku site

The X-Wing on 1 in c26 does it in a step.
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hughwill



Joined: 05 Apr 2010
Posts: 413
Location: Birmingham UK

PostPosted: Fri Feb 12, 2016 1:31 pm    Post subject: Reply with quote

yeoks wrote:


The X-Wing on 1 in c26 does it in a step.


I still can't do it without the other wings......?
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yeoks



Joined: 16 May 2010
Posts: 33

PostPosted: Fri Feb 12, 2016 3:21 pm    Post subject: Reply with quote

Hugh,
First, either X-Wings on 1 (whether r26 or c26) removes 1 from both r1c4 and r4c3.
After some tidying up, you get a pair of 26 in c4, then another pair of 19 in box 5. I hope it helps.
Regards,
Yeoks
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hughwill



Joined: 05 Apr 2010
Posts: 413
Location: Birmingham UK

PostPosted: Sat Feb 13, 2016 11:08 am    Post subject: Reply with quote

yeoks wrote:
Hugh,
First, either X-Wings on 1 (whether r26 or c26) removes 1 from both r1c4 and r4c3.
After some tidying up, you get a pair of 26 in c4, then another pair of 19 in box 5. I hope it helps.
Regards,
Yeoks


You are entirely correct- I was lax on my eliminations - not something
you want to do too often!
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