X-Cycles

Advanced methods and approaches for solving Sudoku puzzles

X-Cycles

Postby Willie » Fri Aug 08, 2008 8:43 am

Could somebody provide me with some puzzles that require X-Cycles to solve. They were needed for two 'fiendish' puzzles I have solved in the last week or so and I would like to practice the technique.
Willie
 
Posts: 2
Joined: 08 August 2008

Postby Mike Barker » Fri Aug 08, 2008 10:17 am

Try the Zoo - puzzles identified as two or three strong links. There are both simple and grouped examples.
Mike Barker
 
Posts: 458
Joined: 22 January 2006

Re: X-Cycles

Postby claudiarabia » Tue Aug 19, 2008 12:46 pm

Willie wrote:Could somebody provide me with some puzzles that require X-Cycles to solve. They were needed for two 'fiendish' puzzles I have solved in the last week or so and I would like to practice the technique.


This puzzle requires an XY-Wing, a Turbot-Fish and 3 Bi-directional X-Cycles.

Code: Select all
. . . . 7 . . . 4
. 9 . 6 . . . 3 .
. . 1 . . 8 . . .
. 6 . 1 . 7 9 . .
7 . . . 5 . . . 2
. . 8 2 . 3 . 1 .
. . . 9 . . 8 . .
. 3 . . . 1 . 7 .
4 . . . 2 . . . .


It is very difficult to spot puzzles which have the X-Cycle as only advanced strategy. I hope you know the other Strategies too.

With best wishes

Claudia
claudiarabia
 
Posts: 288
Joined: 14 May 2006

Postby storm_norm » Mon Aug 25, 2008 3:07 am

Code: Select all
. 6 .|8 . 9|. 1 .
4 2 .|. 1 .|. 8 .
1 . .|. . .|. . 2
-----+-----+-----
3 . 7|. . .|2 . .
. . .|4 . 5|. . .
. . 4|. . .|5 . 6
-----+-----+-----
2 . .|. . .|. . 9
. 8 .|. 7 .|. 2 1
. 4 .|2 . 3|. 6 .


the x-cycle is on candidate 7
storm_norm
 
Posts: 85
Joined: 27 February 2008


Return to Advanced solving techniques

cron