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 

Stuart/Mepham Fri June 1st

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other puzzles
View previous topic :: View next topic  
Author Message
Mogulmeister



Joined: 03 May 2007
Posts: 1151
PostPosted: Fri Jun 01, 2007 11:28 am    Post subject: Stuart/Mepham Fri June 1st Reply with quote
Here's today's puzzle:

Code:
 
+---+---+---+
|...|.8.|...|
|52.|...|.86|
|.1.|9..|.4.|
+---+---+---+
|.7.|3.1|.9.|
|1..|.9.|..4|
|.5.|8.6|.1.|
+---+---+---+
|.6.|..9|.7.|
|29.|...|.58|
|...|.2.|...|
+---+---+---+
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Jun 01, 2007 9:11 pm    Post subject: Reply with quote
Seems to me, this one needs two XY-wings. There is a UR that is not, in the end, useful.

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



Joined: 03 May 2007
Posts: 1151
PostPosted: Fri Jun 01, 2007 9:37 pm    Post subject: Reply with quote
Yes, same for me - any other solve paths ?
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jun 02, 2007 8:50 pm    Post subject: Reply with quote
This is where you find the first XY-wing:
Code:
+-------------------+-------------------+-------------------+
| 469   3     4679  | 14567 8     457   | 1579  2     1579  |
| 5     2     479   | 147   137   347   | 1379  8     6     |
| 8     1     67    | 9     3567  2     | 357   4     357   |
+-------------------+-------------------+-------------------+
| 46    7     246   | 3     45    1     | 8     9     25    |
| 1     8     3     | 2     9     57    | 57    6     4     |
| 49    5     249   | 8     47    6     | 237   1     237   |
+-------------------+-------------------+-------------------+
| 3     6     8     | 145   15    9     | 124   7     12    |
| 2     9     1     | 467   367   347   | 46    5     8     |
| 7     4     5     | 16    2     8     | 169   3     19    |
+-------------------+-------------------+-------------------+

It is <125> in R47C59. It eliminates <5> in R4C5.

There is a short chain in the same cells. If R4C9 is <2>, it forces two <5>'s in C5. So, R4C9 is <5>. Taking that road, and the UR, you eventually get to the second XY-wing:
Code:
+-------------+-------------+-------------+
| 9   3   67  | 56  8   4   | 15  2   17  |
| 5   2   4   | 17  13  37  | 9   8   6   |
| 8   1   67  | 9   56  2   | 35  4   37  |
+-------------+-------------+-------------+
| 6   7   2   | 3   4   1   | 8   9   5   |
| 1   8   3   | 2   9   5   | 7   6   4   |
| 4   5   9   | 8   7   6   | 23  1   23  |
+-------------+-------------+-------------+
| 3   6   8   | 145 15  9   | 124 7   12  |
| 2   9   1   | 467 36  37  | 46  5   8   |
| 7   4   5   | 16  2   8   | 16  3   9   |
+-------------+-------------+-------------+

It is <156> in R19C47. I cannot see anything else, other than a similar chain in the same cells as the XY-wing.

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



Joined: 03 May 2007
Posts: 1151
PostPosted: Sat Jun 02, 2007 9:06 pm    Post subject: Reply with quote
I have to agree.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Other 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