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 30 DB

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



Joined: 30 May 2007
Posts: 677
Location: Victoria, KS
PostPosted: Sat Jan 30, 2010 4:46 pm    Post subject: Jan 30 DB Reply with quote
The January 30 DB is atypically easy.

Solution: x-wing (3)


Earl


Code:

+-------+-------+-------+
| . . . | . . 1 | . . . |
| . 8 1 | 6 . . | 5 . . |
| . 4 . | 9 . 2 | . 7 . |
+-------+-------+-------+
| 3 1 . | . . . | 8 . 4 |
| . 6 . | . . . | . 9 . |
| 8 . 7 | . . . | . 5 3 |
+-------+-------+-------+
| . 5 . | 2 . 4 | . 1 . |
| . . 6 | . . 9 | 3 4 . |
| . . . | 5 . . | . . . |
+-------+-------+-------+

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message Send e-mail
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sat Jan 30, 2010 9:56 pm    Post subject: Reply with quote
Quote:
There is a XY-wing 27-9 that solves it.


Keith
Back to top
View user's profile Send private message
Louise56



Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA
PostPosted: Sun Jan 31, 2010 4:07 pm    Post subject: Reply with quote
I saw the 3 x-wing but still could not solve it. I see where the 279 wing is but am not sure what to do with it. Confused
Back to top
View user's profile Send private message
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Sun Jan 31, 2010 5:03 pm    Post subject: Reply with quote
After basics:
Code:
+-------------------+-------------------+-------------------+
| 25679 2379  2359  | 38    3578  1     | 4     238   2689  |
| 279   8     1     | 6     4     37    | 5     23    29    |
| 56    4     35    | 9     358   2     | 16    7     168   |
+-------------------+-------------------+-------------------+
| 3     1     29    | 7     29    5     | 8     6     4     |
| 45    6     45    | 13    123   8     | 127   9     127   |
| 8     29@   7     | 4     129   6     | 12    5     3     |
+-------------------+-------------------+-------------------+
| 79@   5     389   | 2     367   4     | 679   1     678   |
| 127   27#   6     | 18    178   9     | 3     4     5     |
| 1479 37-9   3489  | 5     1367  37    | 2679  28    2678  |
+-------------------+-------------------+-------------------+

The X-wing is in R37. It takes out 3 in five cells in C35. From then it is just singles. Hint: After the X-wing, solve R5C4.

The XY-wing is a little trickier. It is marked, and takes out 9 in R9C2. That causes a pair 37 in R9. Then you can solve 9 in C79. Then, a hidden pair 29 in C3, and a hidden triple 578 in C5. Solve R3C3, and it is then only singles.

I suppose we can discuss if a hidden triple is a "basic" move.

Keith
Back to top
View user's profile Send private message
Louise56



Joined: 21 Sep 2005
Posts: 94
Location: El Cajon, California USA
PostPosted: Sun Jan 31, 2010 5:24 pm    Post subject: Reply with quote
Thanks Keith, I can't believe that I didn't take out the 3 in r5c5! Thanks also for your explanation of the wing. 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 -> 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