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Aug 13 VH

 
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prakash



Joined: 02 Jan 2008
Posts: 67
Location: New Jersey, USA
PostPosted: Wed Aug 13, 2008 12:36 am    Post subject: Aug 13 VH Reply with quote
Quite straight forward. Wonder if there is anything other than an XY Wing.
Quote:


XY Wing 25-29-59 clears R7C3 and the puzzle solves itself
.---------------.---------------.---------------.
| *29 79 6 | 8 5 1 | 27 3 4 |
| 1 3 *25 | 6 4 7 | 25 9 8 |
| 8 57 4 | 9 3 2 | 57 1 6 |
:---------------+---------------+---------------:
| 4 158 258 | 7 69 69 | 3 58 12 |
| 3 6 7 | 5 12 8 | 9 4 12 |
| 25 158 9 | 3 12 4 | 6 58 7 |
:---------------+---------------+---------------:
| 6 2 3-5 | 1 8 35 | 4 7 9 |
| 7 89 38 | 4 69 369 | 1 2 5 |
| *59 4 1 | 2 7 59 | 8 6 3 |

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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Wed Aug 13, 2008 1:53 am    Post subject: Re: Aug 13 VH Reply with quote
prakash wrote:
Quite straight forward. Wonder if there is anything other than an XY Wing.


Keep wondering, you didn't post the original puzzle.
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
PostPosted: Wed Aug 13, 2008 7:37 am    Post subject: Was the Xy wing "hidden" Reply with quote
My solution used an XY wing BUT one element was "hidden" via 2 incidence sof XYZ so wherever Z is there is an XY left to complete the wing. Maybe I missed something but if you did the same thing is this a newish variant of XY wings?
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Wed Aug 13, 2008 12:12 pm    Post subject: Reply with quote
wapati said:
Quote:
you didn't post the original puzzle


I assume this forum is about the dailysudoku.com puzzle Confused

Code:

 *-----------*
 |..6|...|.3.|
 |13.|..7|..8|
 |8..|..2|.16|
 |---+---+---|
 |...|7..|3..|
 |.6.|5.8|.4.|
 |..9|..4|...|
 |---+---+---|
 |62.|1..|..9|
 |7..|4..|.25|
 |.4.|...|8..|
 *-----------*
 *--------------------------------------------------*
 | 29   79   6    | 8    5    1    | 27   3    4    |
 | 1    3    25   | 6    4    7    | 25   9    8    |
 | 8    57   4    | 9    3    2    | 57   1    6    |
 |----------------+----------------+----------------|
 | 4    158  258  | 7    69   69   | 3    58   12   |
 | 3    6    7    | 5    12   8    | 9    4    12   |
 | 25   158  9    | 3    12   4    | 6    58   7    |
 |----------------+----------------+----------------|
 | 6    2    35   | 1    8    35   | 4    7    9    |
 | 7    89   38   | 4    69   369  | 1    2    5    |
 | 59   4    1    | 2    7    59   | 8    6    3    |
 *--------------------------------------------------*


all I see is the xy-wing
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Captain Pete



Joined: 09 Jun 2007
Posts: 55
Location: Oley, PA
PostPosted: Wed Aug 13, 2008 12:19 pm    Post subject: Reply with quote
Using arkietech's diagram, all that is needed to solve this one is the 69,69,69,369 UR. Not really a VH puzzle.
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Wed Aug 13, 2008 12:44 pm    Post subject: Reply with quote
arkietech wrote:
wapati said:
Quote:
you didn't post the original puzzle


I assume this forum is about the dailysudoku.com puzzle Confused


Yep, and I went to look all I could get was the Aug 12th easy.
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cgordon



Joined: 04 May 2007
Posts: 769
Location: ontario, canada
PostPosted: Wed Aug 13, 2008 1:29 pm    Post subject: Reply with quote
The Type 1 UR was clearly conspicuous in its perceptibility. As easy as the Very Hards get.
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George Woods



Joined: 28 Mar 2006
Posts: 304
Location: Dorset UK
PostPosted: Wed Aug 13, 2008 2:59 pm    Post subject: The hidden XY wing Reply with quote
I tend to refuse the DR solutions, and look for the others.

I missed the simple XY chain 259, but saw first the "hidden" one whichI think is interesting. in BOX 4 there are two 158, and the one must go into one of these to leave the other to give the XY chain 589 eliminating 5 in r6c1 and solving the puzzle. So is there a proper and better description of this that I have called "hidden"?
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Clement



Joined: 24 Apr 2006
Posts: 1113
Location: Dar es Salaam Tanzania
PostPosted: Wed Aug 13, 2008 5:50 pm    Post subject: Daily Sudoku: Wed 13-Aug-2008 VH Reply with quote
UR {6,9} in r48c56 eliminating 69 in r8c6 solves the puzzle.
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Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA
PostPosted: Wed Aug 13, 2008 7:19 pm    Post subject: Reply with quote
George Woods wrote:
I missed the simple XY chain 259, but saw first the "hidden" one whichI think is interesting. in BOX 4 there are two 158, and the one must go into one of these to leave the other to give the XY chain 589 eliminating 5 in r6c1 and solving the puzzle. So is there a proper and better description of this that I have called "hidden"?

George,

That is a standard two ALS elimination, here involving two 2-cell ALSs. The first is 158 in r46c2. The second is 589 in r8c2 & r9c1. The "shared exclusive" digit is <8>. The "shared common" digit is <5>. The <5> at r6c1 can "see" all three of these <5>s and so is eliminated.

I believe some folks call these "xz wings" or some such. In any case, XY and XYZ Wings are just the simplest cases of the more general two ALS elimination.
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wapati



Joined: 10 Jun 2008
Posts: 472
Location: Brampton, Ontario, Canada.
PostPosted: Wed Aug 13, 2008 10:00 pm    Post subject: Re: The hidden XY wing Reply with quote
George Woods wrote:
I tend to refuse the DR solutions, and look for the others.


Code:
 *--------------------------------------------------*
 | 9-2  79   6    | 8    5    1    | 27   3    4    |
 | 1    3   @25   | 6    4    7    | 25   9    8    |
 | 8    57   4    | 9    3    2    | 57   1    6    |
 |----------------+----------------+----------------|
 | 4    158  58-2 | 7    69   69   | 3    58   12   |
 | 3    6    7    | 5    12   8    | 9    4    12   |
 |@25   158  9    | 3    12   4    | 6    58   7    |
 |----------------+----------------+----------------|
 | 6    2   #35   | 1    8    35   | 4    7    9    |
 | 7    89   38   | 4    69   369  | 1    2    5    |
 |#59   4    1    | 2    7    59   | 8    6    3    |
 *--------------------------------------------------*


Another non-DR way is:

The strong link on 5s in box 7 allow a w-wing on 25s that make the marked eliminations, rendering it all too easy. Wink
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arkietech



Joined: 31 Jul 2008
Posts: 1834
Location: Northwest Arkansas USA
PostPosted: Thu Aug 14, 2008 10:01 am    Post subject: Reply with quote
wapati said:
Quote:
The strong link on 5s in box 7 allow a w-wing on 25s


Nice Find! Very Happy
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