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Jan 4 VH

 
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jan 04, 2015 6:10 am    Post subject: Jan 4 VH Reply with quote
Code:

+------------+------------+--------------+
| 5  8   6   | 47 479 3   | 124  14  27  |
| 7  3   4   | 8  1   2   | 6    9   5   |
| 12 129 129 | 6  479 5   | 1248 134 278 |
+------------+------------+--------------+
| 8  124 127 | 5  247 9   | 3    27  6   |
| 6  5   27  | 3  27  1   | 9    8   4   |
| 9  24  3   | 47 68  68  | 5    27  1   |
+------------+------------+--------------+
| 4  69  5   | 2  3   7   | 18   16  89  |
| 3  7   89  | 1  5   468 | 24   46  29  |
| 12 126 128 | 9  468 468 | 7    5   3   |
+------------+------------+--------------+

Play this puzzle online at the Daily Sudoku site

Was a two-stepper for me.
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Sun Jan 04, 2015 11:06 am    Post subject: Re: Jan 4 VH Reply with quote
Marty R. wrote:
Was a two-stepper for me.


Yes, I quite liked this. The obvious XY-Wing leads nowhere at
all despite resolving some cells and the Type 1 UR is equally useless. But
the actual solution, although simple, is quite elegant....
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Sun Jan 04, 2015 12:07 pm    Post subject: Reply with quote
There is a set of three in row 3 that will help.
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dongrave



Joined: 06 Mar 2014
Posts: 572
PostPosted: Sun Jan 04, 2015 4:07 pm    Post subject: Reply with quote
The lone 9 in row 1, the 129 triple in box 1, the lone 3 in box 3, the restricted 4's in box 9, and the resulting 68 pair in column 6 gave me the following grid after basics.

Code:

 +------------+------------+--------------+
 | 5  8   6   | 47 9   3   | 124  14  27  |
 | 7  3   4   | 8  1   2   | 6    9   5   |
 | 12 129 129 | 6  47  5   | 48   3   78  |
 +------------+------------+--------------+
 | 8  124 127 | 5  247 9   | 3    27  6   |
 | 6  5   27  | 3  27  1   | 9    8   4   |
 | 9  24  3   | 47 68  68  | 5    27  1   |
 +------------+------------+--------------+
 | 4  69  5   | 2  3   7   | 18   16  89  |
 | 3  7   89  | 1  5   68  | 24   46  29  |
 | 12 126 128 | 9  68  4   | 7    5   3   |
 +------------+------------+--------------+


Then the 148 XY wing with the pivot in r3c7 forced r7c8 = 6 which solved it (I think).
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Sun Jan 04, 2015 5:05 pm    Post subject: Reply with quote
dongrave wrote:
The lone 9 in row 1, the 129 triple in box 1, the lone 3 in box 3, the restricted 4's in box 9, and the resulting 68 pair in column 6 gave me the following grid after basics.

Code:

 +------------+------------+--------------+
 | 5  8   6   | 47 9   3   | 124  14  27  |
 | 7  3   4   | 8  1   2   | 6    9   5   |
 | 12 129 129 | 6  47  5   | 48   3   78  |
 +------------+------------+--------------+
 | 8  124 127 | 5  247 9   | 3    27  6   |
 | 6  5   27  | 3  27  1   | 9    8   4   |
 | 9  24  3   | 47 68  68  | 5    27  1   |
 +------------+------------+--------------+
 | 4  69  5   | 2  3   7   | 18   16  89  |
 | 3  7   89  | 1  5   68  | 24   46  29  |
 | 12 126 128 | 9  68  4   | 7    5   3   |
 +------------+------------+--------------+


Then the 148 XY wing with the pivot in r3c7 forced r7c8 = 6 which solved it (I think).


My 2nd step was the XYZ-Wing on 124 pivoted in r1c7 => r3c7<>4
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hughwill



Joined: 05 Apr 2010
Posts: 424
Location: Birmingham UK
PostPosted: Mon Jan 05, 2015 10:49 am    Post subject: Reply with quote
Following Dongrave's post and looking at it again I see that I didn't do all the
basics either. I relied on an unnecessary x-wing to take out the 1 from
r7c1 when there's a box-line which does the same.

Which leaves the 148 XY-wing to polish it off...

I put my slackness down to being too flabby after the holidays...
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Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA
PostPosted: Mon Jan 05, 2015 4:13 pm    Post subject: Reply with quote
My excuse on the basics is that I first did the puzzle with pencil and paper and got all the basics, then did it on Draw/Play for the purpose of posting the grid and I didn't catch everything that I did with pencil and paper.
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