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 

Jellyfish

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



Joined: 21 Apr 2006
Posts: 536

PostPosted: Fri Feb 01, 2008 9:10 am    Post subject: Jellyfish Reply with quote

Code:
 +-------+-------+-------+
 | . . 1 | . . . | 4 . . |
 | . 3 2 | . . . | 1 8 . |
 | 5 4 . | . . . | . 3 6 |
 +-------+-------+-------+
 | . . . | 1 . 3 | . . . |
 | . . . | 6 4 2 | . . . |
 | . . . | 7 . 8 | . . . |
 +-------+-------+-------+
 | 8 1 . | . . . | . 7 2 |
 | . 2 7 | . . . | 3 4 . |
 | . . 5 | . . . | 8 . . |
 +-------+-------+-------+
>>> play online
I did not spot it. Instead i solved it with a variant of w-wing. A couple of basics, before you get the first number. You will also need a wing, before the fish appears.
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Fri Feb 01, 2008 4:42 pm    Post subject: Reply with quote

Ravel, my curiosity has got the best of me. You have posted three puzzles that have the same number of givens and in the same cells. That can't be a coincidence. Question Question
Back to top
View user's profile Send private message
nataraj



Joined: 03 Aug 2007
Posts: 1048
Location: near Vienna, Austria

PostPosted: Fri Feb 01, 2008 5:38 pm    Post subject: Reply with quote

I did meet a jellyfish. If I hadn't been on the lookout, who knows?
xyz-wing 259,
coloring 9: -r3c3=r3c7-r2c9=r8c9-r8c1=r9c2- ; r1c2<>9,
w-wing (59) r5c8 to r6c2 and
UR 59 => r6c2=5

ta daa - the jellyfish! Here 9 in rows 3,4,5,9 is confined to cols 2,3,7,8 and 9 in r1c8 is toast.
Code:

+--------------------------+--------------------------+--------------------------+
| 679     68      1        | 3       28      59       | 4       259     57       |
| 79      3       2        | 459     6       459      | 1       8       579      |
| 5       4       89       | 28      17      17       | 29      3       6        |
+--------------------------+--------------------------+--------------------------+
| 24      789     689      | 1       5       3        | 2679    269     48       |
| 1       789     389      | 6       4       2        | 579     59      38       |
| 24      5       36       | 7       9       8        | 26      1       34       |
+--------------------------+--------------------------+--------------------------+
| 8       1       4        | 59      3       569      | 569     7       2        |
| 69      2       7        | 589     18      1569     | 3       4       59       |
| 3       69      5        | 24      27      47       | 8       69      1        |
+--------------------------+--------------------------+--------------------------+



One more coloring elimination 9:-r1c6=r1c1-r3c3=r3c7-r2c9=r8c9- ; r8c6<>9

One last xy-wing 29-25-59

and ?

- done.
Back to top
View user's profile Send private message Send e-mail Visit poster's website
ravel



Joined: 21 Apr 2006
Posts: 536

PostPosted: Fri Feb 01, 2008 7:54 pm    Post subject: Reply with quote

Marty R. wrote:
Ravel, my curiosity has got the best of me. You have posted three puzzles that have the same number of givens and in the same cells. That can't be a coincidence. Question Question
I already mentioned, that i like to take puzzles from the Patterns Game thread. The guys try to find as much as possible puzzles with different "Sudoku Explainer" ratings to a given pattern. About each week or 10 days a new game is started. They have 2 ratings now, so i am not sure, what exactly they mean, but puzzles with ratings between 4.2 and 7.3 (harder) often seem to be interesting. You will always find the name of the discoverer (e.g. TTHsieh, JPF, gsf or m_bmetcalf), when i post a puzzle here.

nataraj,

rechecking the puzzle now i saw, that there already is a jellyfish after basics (xyz- or w-wing are not needed), and it eliminates 3 numbers. But a wing (another one) is needed after it to solve the puzzle.
Back to top
View user's profile Send private message
storm_norm



Joined: 18 Oct 2007
Posts: 1741

PostPosted: Sat Feb 02, 2008 12:07 am    Post subject: Reply with quote

Marty,

Ravel is being way too modest and I am sure he will never tell you that he probably has hundreds more like it.

norm
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