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 

Jan 17 VH

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



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Sun Jan 16, 2011 10:43 pm    Post subject: Jan 17 VH Reply with quote

XY-Wing 36 39 69 removing the 6's in r89c6 solves it.
Back to top
View user's profile Send private message AIM Address
Dart45



Joined: 16 Apr 2008
Posts: 17
Location: Canada

PostPosted: Mon Jan 17, 2011 4:06 pm    Post subject: Reply with quote

Clement - That would be Jan 17 - LOL

(Edited: Title was Dec 17 - keith)
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Jan 17, 2011 4:31 pm    Post subject: Reply with quote

A W-Wing on 69 will do it too; r5c5<>9.
Back to top
View user's profile Send private message
kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH

PostPosted: Mon Jan 17, 2011 8:22 pm    Post subject: Jan 17 VH Reply with quote

Marty, somehow this puzzle has given me the hives. Please point out the strong link on 6 for the W-wing.

thanks
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Mon Jan 17, 2011 10:49 pm    Post subject: Re: Jan 17 VH Reply with quote

kuskey wrote:
Marty, somehow this puzzle has given me the hives. Please point out the strong link on 6 for the W-wing.

thanks

I have the strong link in column 4. Because there are two 6s in that column in box 5, I think it's referred to a a grouped strong link.
Back to top
View user's profile Send private message
keith



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

PostPosted: Mon Jan 17, 2011 10:53 pm    Post subject: Re: Jan 17 VH Reply with quote

kuskey wrote:
Marty, somehow this puzzle has given me the hives. Please point out the strong link on 6 for the W-wing.

thanks
After basics:
Code:
+----------------+----------------+----------------+
| 5    1    3    | 46   69#  469  | 8    2    7    |
| 6    4    8    | 7    5    2    | 1    9    3    |
| 2    9    7    | 38   1    38   | 6    5    4    |
+----------------+----------------+----------------+
| 1    56   456  | 4568 2    468  | 7    3    9    |
| 7    2    49   | 34   39   1    | 5    8    6    |
| 3    8    569  | 56   7    69*  | 2    4    1    |
+----------------+----------------+----------------+
| 8    3    2    | 1    4    7    | 9    6    5    |
| 4    56   1    | 9    8    5-6  | 3    7    2    |
| 9    7    56   | 2    36*  35-6 | 4    1    8    |
+----------------+----------------+----------------+
I don't see it either.

However, the 69 cells are the basis of a M-wing, making the eliminations shown.

Keith
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5770
Location: Rochester, NY, USA

PostPosted: Tue Jan 18, 2011 12:03 am    Post subject: Re: Jan 17 VH Reply with quote

keith wrote:
kuskey wrote:
Marty, somehow this puzzle has given me the hives. Please point out the strong link on 6 for the W-wing.

thanks
After basics:
Code:
+----------------+----------------+----------------+
| 5    1    3    | 46   69#  469  | 8    2    7    |
| 6    4    8    | 7    5    2    | 1    9    3    |
| 2    9    7    | 38   1    38   | 6    5    4    |
+----------------+----------------+----------------+
| 1    56   456  | 4568 2    468  | 7    3    9    |
| 7    2    49   | 34   39   1    | 5    8    6    |
| 3    8    569  | 56   7    69*  | 2    4    1    |
+----------------+----------------+----------------+
| 8    3    2    | 1    4    7    | 9    6    5    |
| 4    56   1    | 9    8    5-6  | 3    7    2    |
| 9    7    56   | 2    36*  35-6 | 4    1    8    |
+----------------+----------------+----------------+
I don't see it either.

However, the 69 cells are the basis of a M-wing, making the eliminations shown.

Keith

Keith, if r1c4=6, then r1c5=9. If either of r46c4=6, then r6c6=9.
Back to top
View user's profile Send private message
keith



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

PostPosted: Tue Jan 18, 2011 1:57 am    Post subject: Reply with quote

Marty,

Your logic is correct.

I suppose it is a grouped W-wing? I did not recognize it as a W-wing.

Keith
Back to top
View user's profile Send private message
George Woods



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

PostPosted: Wed Jan 19, 2011 9:07 pm    Post subject: w wings Reply with quote

I have always been slightly worried by the "strong link" aspect of w wings as the rule has been formalised elsewhere.

The original logic was "if both 69s were 6 then there is nowhere for a 6 in col 4" in the current example. i.e one of 69 must be 9 .....

so the strong wing in col 4 is sufficient but not strictly needed
Back to top
View user's profile Send private message
keith



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

PostPosted: Wed Jan 19, 2011 9:28 pm    Post subject: Reply with quote

George,

Thank you for that!

Keith
Back to top
View user's profile Send private message
ronk



Joined: 07 May 2006
Posts: 398

PostPosted: Wed Jan 19, 2011 11:35 pm    Post subject: Re: w wings Reply with quote

George Woods wrote:
I have always been slightly worried by the "strong link" aspect of w wings as the rule has been formalised elsewhere.

The original logic was "if both 69s were 6 then there is nowhere for a 6 in col 4" in the current example. i.e one of 69 must be 9 .....

so the strong wing in col 4 is sufficient but not strictly needed

That's a red-herring argument. If there weren't a strong link, there would be somewhere for a 6 in col 4.
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