[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Ian Wadham]

https://bugs.kde.org/show_bug.cgi?id=384546

--- Comment #6 from Ian Wadham  ---
Not at all, Steve. No worries. I enjoyed the challenge!

I was also a little worried that I might have left a time-limit in the
algorithm that checks that the solution is unique. It runs until all
possibilities are exhausted, which could take some time at Unlimited
difficulty-level on the machines of 10 years ago. I keyed in your puzzle and
KSudoku duly reported a unique solution. So all is OK.

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[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Steve Soule]

https://bugs.kde.org/show_bug.cgi?id=384546

--- Comment #5 from Steve Soule  ---
You're right, of course.  I don't know what I was thinking.  I'm sorry for
wasting your time.

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[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Ian Wadham]

https://bugs.kde.org/show_bug.cgi?id=384546

Ian Wadham  changed:

   What|Removed |Added

 Status|REPORTED|RESOLVED
 Resolution|--- |NOT A BUG

--- Comment #4 from Ian Wadham  ---
@Steve: I am the author of the puzzle generators and solvers in KSudoku.

My congratulations to you on reaching Unlimited level in Killer KSudoku, but I
am sorry, this is not a bug: the puzzle you show in your screenshot does indeed
have a unique solution. The Notes you show are correct for normal constraints
on rows, columns and 3x3 boxes and they can make cages add up correctly, BUT
you have missed one further constraint, which applies to Killer KSudoku cages
but not Mathdoku cages. All the digits in a Killer cage must be unique. In the
cage with total 23 at top center, there is already a 1, so you cannot have a 1
in the bottom-right cell of that cage. It must be a 2. That forces the cell to
its left to be a 7 and then the cage with total 18 must have unique contents.
There is only one place its 7 can go. Thanks for the interesting case!

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[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Ian Wadham]

https://bugs.kde.org/show_bug.cgi?id=384546

--- Comment #3 from Ian Wadham  ---
(In reply to Steve Soule from comment #2)
> Your demand that I reproduce the bug is not reasonable, since that would
> require a random number generator to produce precisely the same values as it
> did before.

@Steve: Not quite true. You can re-enter the cages and the initial clues, using
the Enter In A Puzzle and Check buttons on the main-menu screen. A message
comes up to tell you how to do that - see also the KSudoku Handbook.
https://docs.kde.org/trunk5/en/ksudoku/ksudoku/interface.html#welcome-screen

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[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Steve Soule]

https://bugs.kde.org/show_bug.cgi?id=384546

Steve Soule  changed:

   What|Removed |Added

 Resolution|WAITINGFORINFO  |---
 Status|NEEDSINFO   |REPORTED

--- Comment #2 from Steve Soule  ---
Your demand that I reproduce the bug is not reasonable, since that would
require a random number generator to produce precisely the same values as it
did before.

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[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Justin Zobel]

https://bugs.kde.org/show_bug.cgi?id=384546

Justin Zobel  changed:

   What|Removed |Added

 Resolution|--- |WAITINGFORINFO
 Status|REPORTED|NEEDSINFO

--- Comment #1 from Justin Zobel  ---
Thank you for reporting this issue in KDE software. As it has been a while
since this issue was reported, can we please ask you to see if you can
reproduce the issue with a recent software version?

If you can reproduce the issue, please change the status to "REPORTED" when
replying. Thank you!

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[ksudoku] [Bug 384546] Generated killer sudoku puzzle with multiple valid solutions (ksudoku 1.3)

[Steve Soule]

https://bugs.kde.org/show_bug.cgi?id=384546

Steve Soule  changed:

   What|Removed |Added

 CC||sts33n...@gmail.com

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