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 

Squiggly VH July 6, 2009

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku Squiggly puzzles
View previous topic :: View next topic  
Author Message
mm01090



Joined: 02 Nov 2007
Posts: 6

PostPosted: Fri Nov 20, 2009 2:42 pm    Post subject: Squiggly VH July 6, 2009 Reply with quote

I have done most of the Very Hard Squigglies, but I am stuck on a few.

After basics and LOL, here is what I have:

+-------------+------------+---------------+
| 9 15 3 | 2 4 7 | 156 16 8 |
| 4 2 7 | 8 6 9 | 15 3 15 |
| 156 156 8 | 15 7 4 | 3 9 2 |
+-------------+------------+---------------+
| 2 8 16 | 167 5 3 | 9 47 146 |
| 3 156 2 | 4 9 156 | 8 16 7 |
| 156 3 9 | 1567 8 156 | 2 47 1456 |
+-------------+------------+---------------+
| 8 4 56 | 3 1 56 | 7 2 9 |
| 7 9 4 | 16 2 8 | 16 5 3 |
| 56 7 156 | 9 3 2 | 4 8 16 |
+-------------+------------+---------------+

The hint puts a '6' in R5C8. Can someone explain why?
Back to top
View user's profile Send private message
Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Fri Nov 20, 2009 6:03 pm    Post subject: Reply with quote

I think I can.

If you run your eye along row 5 you will find it intersects five boxes. Let’s call them A, B, C, D and E from left to right.

Now, your diagram makes it clear that 1 occupies row 5 or row 6 in boxes A and D. Accordingly it can be excluded from row 5 in box E.

Steve
Back to top
View user's profile Send private message
mm01090



Joined: 02 Nov 2007
Posts: 6

PostPosted: Sun Nov 22, 2009 1:32 pm    Post subject: Reply with quote

Thanks. That did the trick.

Is there a name for that type of logic or technique?
Back to top
View user's profile Send private message
Steve R



Joined: 24 Oct 2005
Posts: 289
Location: Birmingham, England

PostPosted: Sun Nov 22, 2009 8:33 pm    Post subject: Reply with quote

It's usually called "box-line interaction," just as in classical SuDoku.

Steve
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Daily Sudoku Squiggly 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