Help with XY-Wing XYZ-Wing

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Help with XY-Wing XYZ-Wing

Postby rjamil » Sun Oct 23, 2016 6:57 pm

Hi,

Got following valid Expert level standard Sudoku puzzle from Sudoku Master for Android:
Code: Select all
000030800075204100209006000003700040640008500050000000001602900000050007000000080

Error.png
Puzzle
Error.png (18.98 KiB) Viewed 233 times

I am interested to solve with Naked / Hidden Single/Pair/Triple/Quad, Pointing and Claiming Intersection Removal, Box-Line Reduction Intersection Removal, X-Wing, Sword Fish, Jelly Fish, XY-Wing, XYZ-Wing and Guess strategies.

The above mentioned puzzle become unsolvable with all above strategies and solved without XY-Wing and XYZ-Wing strategies.

Currently I have coded XY-Wing and XYZ-Wing in my Sudoku solver program and tested various puzzles.

R. Jamil
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Re: Help with XY-Wing XYZ-Wing

Postby SteveG48 » Sun Oct 23, 2016 8:43 pm

RJ, I'm not sure what your question is here. That puzzle can't be solved using just the strategies that you've listed.
Steve
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Re: Help with XY-Wing XYZ-Wing

Postby rjamil » Sun Oct 23, 2016 8:56 pm

Hi Steve,

Many thanks for your quick response.

However, I have just added pencil mark option in my standard Sudoku solver program and look after each step. Found bug in rollback XYZ-Wing routine, corrected and now problem solved.

Steps taken to solve the puzzle including XY-Wing and XYZ-Wing (and Trial and Error, i.e., Guess!) are attached.

R. Jamil
Attachments
rj.txt
Solved
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Re: Help with XY-Wing XYZ-Wing

Postby SteveG48 » Sun Oct 23, 2016 10:45 pm

Glad you got it, RJ.

All things are possible when you allow guesswork.
Steve
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