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 

XY chains

 
Post new topic   Reply to topic    dailysudoku.com Forum Index -> Solving techniques, and terminology
View previous topic :: View next topic  
Author Message
audrey88



Joined: 12 Aug 2007
Posts: 1

PostPosted: Sun Aug 12, 2007 10:46 pm    Post subject: XY chains Reply with quote

Can you explain to me what is meant by an XY chain? Once I get that figured out, maybe more complicated terminology will become clear.
Thanks.
Back to top
View user's profile Send private message
Marty R.



Joined: 12 Feb 2006
Posts: 5178
Location: Rochester, NY, USA

PostPosted: Sun Aug 12, 2007 11:45 pm    Post subject: Reply with quote

Welcome to the forum. Here's one explanation of the XY-Chain.

http://www.sudokuonline.us/xy-chains.php
Back to top
View user's profile Send private message
Asellus



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

PostPosted: Mon Aug 13, 2007 12:23 am    Post subject: Reply with quote

The puzzle below is helpful for practicing the XY Chain technique. Posted recently on another thread, from the position shown the remainder of the puzzle can be solved using nothing but XY Chains.
Code:
+---------------+--------+---------------+
| 345  1345 8   | 9  7 6 | 2   1345 135  |
| 249  47   129 | 3  5 8 | 146 479  69   |
| 3579 6    59  | 4  1 2 | 35  8    3579 |
+---------------+--------+---------------+
| 68   2    7   | 16 4 5 | 9   13   1368 |
| 1    9    56  | 8  3 7 | 56  2    4    |
| 4568 45   3   | 16 2 9 | 7   15   1568 |
+---------------+--------+---------------+
| 357  8    15  | 2  9 4 | 135 6    357  |
| 269  35   269 | 7  8 1 | 345 3459 2359 |
| 29   17   4   | 5  6 3 | 8   179  129  |
+---------------+--------+---------------+
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 -> 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