w-wing

Advanced methods and approaches for solving Sudoku puzzles

w-wing

Postby Gerold » Sat Oct 08, 2016 10:18 am

Hidden pair or not.jpg
Hidden pair or not.jpg (85.23 KiB) Viewed 403 times


Hi, the hodoku next hint is a w-wing. What is another technique to solve this puzzle?? Hidden pair? Is it possible in hoduko to show another hint to solve this puzzle?
Gerold
 
Posts: 1
Joined: 08 October 2016

Re: w-wing

Postby tarek » Mon Oct 10, 2016 12:09 pm

Hi Gerold,

Try disabling w-wing from hoduko technique set. That would take Hodoku to the technique(s) listed after that to try.

Hoduko like many other solvers uses a technique list which are exhausted systematically before moving to the next step.

Tarek
User avatar
tarek
 
Posts: 2612
Joined: 05 January 2006

Re: w-wing

Postby SteveG48 » Tue Oct 11, 2016 8:12 pm

Gerold wrote:Hi, the hodoku next hint is a w-wing. What is another technique to solve this puzzle?? Hidden pair? Is it possible in hoduko to show another hint to solve this puzzle?


Just go to the "all possible steps" tab and click "find all steps". Every possibility for which Hodoku is programmed will be shown.
Steve
User avatar
SteveG48
2017 Supporter
 
Posts: 1962
Joined: 08 November 2013
Location: Orlando, Florida

Re: w-wing

Postby keith » Mon Jul 03, 2017 4:21 pm

Or,

Put the puzzle in HSH, Helmut's Sudoku Helper.

http://www.saueregger.at/sudoku/HSH/HSH.htm

It will show a list of "all" the next steps from which you can pick one. (ALL = a list that of moves human solvers would likely use.)

Keith
keith
2017 Supporter
 
Posts: 209
Joined: 03 April 2006

Re: w-wing

Postby Leren » Mon Jul 03, 2017 9:07 pm

9834572167519268344263815791.827...33..6.81.2...13.487.1..6.3.8..4.13..5.3...27.1

The W Wing was a good way to go but if you want alternatives here are a couple :

Code: Select all
*--------------------------------------------------------------*
| 9     8     3      | 4     5     7      | 2     1     6      |
| 7     5     1      | 9     2     6      | 8     3     4      |
| 4     2     6      | 3     8     1      | 5     7     9      |
|--------------------+--------------------+--------------------|
| 1     49    8      | 2     7    c459    | 69   b569   3      |
| 3     479   579    | 6    d4-9   8      | 1    a59    2      |
| 256   69    259    | 1     3     59     | 4     8     7      |
|--------------------+--------------------+--------------------|
| 25    1     2579   | 57    6     49     | 3     249   8      |
| 268   679   4      | 78    1     3      | 69    269   5      |
| 568   3     59     | 58    49    2      | 7     469   1      |
*--------------------------------------------------------------*

H2 Wing: (9=5) r5c8 - r4c8 = (5-4) r4c6 = (4) r5c5 => - 9 r5c5, or

Code: Select all
*--------------------------------------------------------------*
| 9     8     3      | 4     5     7      | 2     1     6      |
| 7     5     1      | 9     2     6      | 8     3     4      |
| 4     2     6      | 3     8     1      | 5     7     9      |
|--------------------+--------------------+--------------------|
| 1     49    8      | 2     7     459    | 69    569   3      |
| 3     479   79-5   | 6    b49    8      | 1    a59    2      |
| 256   69    259    | 1     3     59     | 4     8     7      |
|--------------------+--------------------+--------------------|
| 25    1     2579   | 57    6     49     | 3     249   8      |
| 268   679   4      | 78    1     3      | 69    269   5      |
| 568   3    d59     | 58   c49    2      | 7     469   1      |
*--------------------------------------------------------------*

XY Chain Length 4: (5=9) r5c8 - (9=4) r5c5 - (4=9) r9c5 - (9=5) r9c3 => - 5 r5c3

The H wing is less well known outside of this forum but has the advantage of having only 3 Strong links, vs 4 for the more standard XY chain.

Leren
Leren
 
Posts: 2854
Joined: 03 June 2012


Return to Advanced solving techniques