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 

Jan 3 VH

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



Joined: 24 Apr 2006
Posts: 1111
Location: Dar es Salaam Tanzania

PostPosted: Sun Jan 02, 2011 10:07 pm    Post subject: Jan 3 VH Reply with quote

XY-Wing 56 57 67 pivoted in r4c2 eliminating 6 in r8c3 solves it.
Back to top
View user's profile Send private message AIM Address
kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH

PostPosted: Mon Jan 03, 2011 6:17 am    Post subject: Jan 3 VH Reply with quote

If things look familiar, try Dec. 20. Besides Clement's solution, look for some of the following:

1) 3 more x-wings on 567
2) 4 w-wings on 56
3) 4 w-wings on 67

at that point, my eyeballs caged permanently so there may be more.
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Mon Jan 03, 2011 4:39 pm    Post subject: Reply with quote

There were a couple of ways to work the 37 UR in boxes 36 plus at least one XY-Chain.
Back to top
View user's profile Send private message
kuskey



Joined: 10 Dec 2008
Posts: 141
Location: Pembroke, NH

PostPosted: Tue Jan 04, 2011 12:01 am    Post subject: Jan 3 VH Reply with quote

Marty, would you be so kind as to give the explanation of your 37 UR solution. I'm trying to learn the more difficult UR techniques and this sure looks like one. Is it a type 6?

thanks
Back to top
View user's profile Send private message
Marty R.



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

PostPosted: Tue Jan 04, 2011 1:07 am    Post subject: Re: Jan 3 VH Reply with quote

kuskey wrote:
Marty, would you be so kind as to give the explanation of your 37 UR solution. I'm trying to learn the more difficult UR techniques and this sure looks like one. Is it a type 6?

thanks

No, it isn't a type anything, just a potential UR or DP.

Code:

+-----------+---------+-------------+
| 9   2  4  | 56 8 1  | 567 367 367 |
| 8   3  7  | 56 9 4  | 256 26  1   |
| 56  56 1  | 7  3 2  | 8   9   4   |
+-----------+---------+-------------+
| 4   57 2  | 8  6 9  | 1   357 357 |
| 1   9  56 | 2  7 3  | 4   8   56  |
| 67  8  3  | 1  4 5  | 267 267 9   |
+-----------+---------+-------------+
| 2   4  8  | 3  1 67 | 9   567 567 |
| 567 1  56 | 9  2 67 | 3   4   8   |
| 3   67 9  | 4  5 8  | 67  1   2   |
+-----------+---------+-------------+

Play this puzzle online at the Daily Sudoku site

Either r2c8 or 9 must be 6 or r4c8 or 9 must be 5. Testing both possibilities I found a common outcome, that is, r78c6=67. Or taking a different path, 5s in r4c8 or 9 leads to an invalidity, forcing r5c9=5.

P.S. I erred above is saying that r78c6=67 was a common outcome.
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 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