dailysudoku.com Forum Index dailysudoku.com
Discussion of Daily Sudoku puzzles
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Aug 13 VH

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles
View previous topic :: View next topic  
Author Message
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 |

Back to top
View user's profile Send private message
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.
Back to top
View user's profile Send private message
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?
Back to top
View user's profile Send private message
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
Back to top
View user's profile Send private message
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.
Back to top
View user's profile Send private message
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.
Back to top
View user's profile Send private message
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.
Back to top
View user's profile Send private message
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"?
Back to top
View user's profile Send private message
Clement



Joined: 24 Apr 2006
Posts: 1111
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.
Back to top
View user's profile Send private message AIM Address
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.
Back to top
View user's profile Send private message Visit poster's website
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
Back to top
View user's profile Send private message
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
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku puzzles All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group