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 

Stuck!

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



Joined: 09 Jun 2007
Posts: 55
Location: Oley, PA

PostPosted: Sat Nov 03, 2007 1:04 pm    Post subject: Stuck! Reply with quote

Any ideas?

Code:

+--------+-----------+---------------+
| 3 9 56 | 46 7  2   | 1   456  8    |
| 4 7 8  | 9  1  56  | 56  3    2    |
| 1 2 56 | 8  3  456 | 569 4579 4679 |
+--------+-----------+---------------+
| 7 4 1  | 5  69 8   | 3   2    69   |
| 9 8 3  | 2  46 1   | 7   46   5    |
| 6 5 2  | 7  49 3   | 8   149  149  |
+--------+-----------+---------------+
| 2 3 7  | 16 5  9   | 4   8    16   |
| 5 6 9  | 14 8  47  | 2   17   3    |
| 8 1 4  | 3  2  67  | 569 5679 679  |
+--------+-----------+---------------+

Play this puzzle online at the Daily Sudoku site
Back to top
View user's profile Send private message
re'born



Joined: 28 Oct 2007
Posts: 80

PostPosted: Sat Nov 03, 2007 3:25 pm    Post subject: Re: Stuck! Reply with quote

Captain Pete wrote:
Any ideas?

Code:
 *-----------------------------------------------------------*
 | 3     9     56    | 46    7     2     | 1     456   8     |
 | 4     7     8     | 9     1     56    | 56    3     2     |
 | 1     2     56    | 8     3     56-4  | 569   4579  4679A |
 |-------------------+-------------------+-------------------|
 | 7     4     1     | 5     69    8     | 3     2     69A   |
 | 9     8     3     | 2     46    1     | 7     46    5     |
 | 6     5     2     | 7     49    3     | 8     149   149   |
 |-------------------+-------------------+-------------------|
 | 2     3     7     | 16    5     9     | 4     8     16A   |
 | 5     6     9     | 14    8     47B   | 2     17B   3     |
 | 8     1     4     | 3     2     67    | 569   5679  679A  |
 *-----------------------------------------------------------*

ALS xz-rule
A={1,4,6,7,9} on r3479c9
B={1,4,7} on r8c68
x=1
z=4
r3c6<>4, solving the puzzle.
Back to top
View user's profile Send private message
nataraj



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

PostPosted: Sat Nov 03, 2007 4:03 pm    Post subject: Reply with quote

it is possible to remove 4 (and also 6) from r3c9:




Start with any cell of the chain, let's say r8c8
follow the weak link for the "=" case, follow the strong link for the "<>" case

if r8c8=7 then r9c9<>7 then r3c9=7 then r3c9<>4
if r8c8<>7 then r8c6=7 (then r8c6<>4) then r3c6=4 then r9c6<>4

this solves the puzzle
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Asellus



Joined: 05 Jun 2007
Posts: 865
Location: Sonoma County, CA, USA

PostPosted: Mon Nov 05, 2007 2:01 am    Post subject: Reply with quote

There is a Sue de Coq:

{17} in R8C8 and R79C9 and {69} in R479C9.

It eliminates <7> from R9C8, <6> from R3C9 and <9> from R36C9.

It doesn't produce an immediate solution (a few more XY Wings do the trick), but is interesting.
Back to top
View user's profile Send private message Visit poster's website
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