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 

Nice Loops

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Solving techniques, and terminology
View previous topic :: View next topic  
Author Message
djray



Joined: 08 Nov 2013
Posts: 4
Location: Middleport,Pa
PostPosted: Fri Nov 08, 2013 6:56 pm    Post subject: Nice Loops Reply with quote
Can anyone help me with nice loops
Back to top
View user's profile Send private message Send e-mail Visit poster's website
keith



Joined: 19 Sep 2005
Posts: 3355
Location: near Detroit, Michigan, USA
PostPosted: Fri Nov 08, 2013 10:02 pm    Post subject: Re: Nice Loops Reply with quote
djray wrote:
Can anyone help me with nice loops


http://sudopedia.enjoysudoku.com/Nice_Loop.html

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



Joined: 08 Nov 2013
Posts: 4
Location: Middleport,Pa
PostPosted: Sun Nov 10, 2013 2:06 pm    Post subject: Type 3 Discontinuous Nice Loop Reply with quote
Current puzzle from Sudoku XP5 @paulspages.com

4 . 7 . 9 2 . 6 .
. 6 2 8 5 . 7 4 .
5 . . 4 7 6 . 2 3
. . 8 . 2 4 . 5 .
2 . . 5 . 7 . . 6
. 5 . 9 . . 2 . .
8 . . . . 5 . . 2
. 2 6 . . 8 . 1 .
. 4 5 2 1 9 6 . .


Current Candidates:
Code:
+----------------------+----------------------+----------------------+
| 4      38     7      | 13     9      2      | 58     6      158    |
| 139    6      2      | 8      5      13     | 7      4      19     |
| 5      189    19     | 4      7      6      | 189    2      3      |
+----------------------+----------------------+----------------------+
| 13679  379    8      | 136    2      4      | 39     5      179    |
| 2      139    1349   | 5      38     7      | 1489   389    6      |
| 1367   5      34     | 9      368    13     | 2      378    478    |
+----------------------+----------------------+----------------------+
| 8      1379   139    | 367    346    5      | 349    379    2      |
| 379    2      6      | 37     34     8      | 3459   1      4579   |
| 37     4      5      | 2      1      9      | 6      378    78     |
+----------------------+----------------------+----------------------+


Hint: The blue and green squares form a Type 3 Discontinuous Nice Loop ([R4C2] -3- [R1C2] =3= [R2C1] -3- [R9C1] -7- [R7C2] =7= [R4C2]). The discontinuity is at the blue square. Candidate 3 can be eliminated from this square.

My 1st of many questions is the notation ([R4C2] -3- [R1C2] means a weak link between ([R4C2] & [R1C2] which are candidates [379] vs [38] is this true?

2nd-Is this a weak link because these two cells ([R4C2] & [R1C2] share only one candidate=3 ??

3rd-Isn't there also a link between ([R4C2] & [R7C2] which are candidates [139] vs [1379] ?

I understand xy chains,forcing chains and forcing loops since these only include bivalue cells. However I am totally confused when cells with 3 or more candidates are in the equation.

Can someone explain the notation as to why there are weak links and strong links.([R4C2] -3- [R1C2] =3= [R2C1] -3- [R9C1] -7- [R7C2] =7= [R4C2]). The discontinuity is at the blue square. Candidate 3 can be eliminated from this square.

Your help will be greatly appreciated. I thank you

(Edited by Marty to align grid)
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Solving techniques, and terminology 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