Algorithm for identification of the XY wing from the Sudoku

Advanced methods and approaches for solving Sudoku puzzles

Algorithm for identification of the XY wing from the Sudoku

Postby IUSUT » Sun Mar 25, 2007 10:24 pm

XY wing is a powerful technique of elimination, which has the disadvantage that the third cells of the chain can be laborious identified. Specially the beginners meet with difficulties in finding XY wing model, and insistently solicit help on web sites:
http://www.intosudoku.com/forum/viewtopic.php?t=99&sid=da2df1dee2df9a7518ec5da5950a99c1

In the study
„Algorithm for identification of the XY wing from the Sudoku grid”
attached to the site:
http://www.sudoku.org.uk/discus/messages/2/3787.html?1174859479

I propose a simple method for identification of the XY wing, which I submit to your analysis.
I'm using now almost exclusively the graphic variant with nonagon, in order to identify XY models from grids.

Mihail Iusut, Romania
IUSUT
 
Posts: 4
Joined: 11 February 2007

Postby wapati » Mon Mar 26, 2007 1:29 am

I disagree. XY wing is rarely needed.

Powerfull suggest lots of eliminations, extreme simplification.
wapati
2010 Supporter
 
Posts: 527
Joined: 13 September 2006
Location: Brampton, Ontario, Canada

Postby Myth Jellies » Mon Mar 26, 2007 4:41 am

Myth Jellies
 
Posts: 593
Joined: 19 September 2005


Return to Advanced solving techniques

cron