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 

Help needed with Type 3 Discontinuous 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: Mon Nov 11, 2013 7:26 pm    Post subject: Help needed with Type 3 Discontinuous Nice Loops 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
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Marty R.



Joined: 12 Feb 2006
Posts: 5122
Location: Rochester, NY, USA

PostPosted: Tue Nov 12, 2013 1:08 am    Post subject: Reply with quote

Any reason for starting another thread with the same post?
Back to top
View user's profile Send private message
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