## w-wing

Advanced methods and approaches for solving Sudoku puzzles

### w-wing

Hidden pair or not.jpg (85.23 KiB) Viewed 748 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

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

tarek

Posts: 2737
Joined: 05 January 2006

### Re: w-wing

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

SteveG48
2018 Supporter

Posts: 2377
Joined: 08 November 2013
Location: Orlando, Florida

### Re: w-wing

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: 215
Joined: 03 April 2006

### Re: w-wing

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: 3315
Joined: 03 June 2012