Clicky

efaith
See picture for example. Each time I left 1 square undone to prevent congratulations screen from blocking view.


Click image for larger version - Name: nonunique.jpg, Views: 106, Size: 92.57 KB
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houdah
Wow! I'm shocked!

This really, really should not happen.

I will investigate and fix this with the next update!

Thanks for reporting te issue.

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

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houdah
Hi!

Could you please select "start over" in ACTSudoku and send me a screenshot of the board as it started out?

The way you show it in the first image, it requires guessing to be solved. That situation should not be reached unless you entered a wrong number. Indeed, the Sudoku generator was able to resolve the puzzle without resorting to guessing.

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

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efaith
Hi Pierre,

Here it is.


Click image for larger version - Name: startover.jpg, Views: 82, Size: 87.00 KB
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efaith
Pierre,

One detail you cannot see from the photograph: I had automatic markers turned on. I have just tested it again and it is physically impossible to enter a number that is "illegal" given the immediately surrounding numbers (square and rows). What this should mean is that it is physically impossible to complete the puzzle incorrectly. At some point, one of the squares would have been completely emptied of markers making it impossible to fill that square. That the last square was still non-empty (had one marker in it) proves that the solution obeys the Sudoku rule (of no duplicate numbers in a row and a square). The automatic markers being turned on guarantees this. Or so I think.

Either I am about to learn something pretty amazing when you explain what I am doing wrong (and the photos are right there, so if one of these two solutions is bad it's right there), or else the Sudoku generator, which supposedly resolved the puzzle without guessing, in fact guessed - i.e. at some point picked one of two possible solutions. Being contradicted on this is actually pretty exciting. I hope I am wrong because if I am I'm going to learn something that will surprise me.
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houdah
Hi!

I reach the exact same state you reached in the first photograph.

From there one has to guess. Either guess leads to a valid solution. Both of which you show in your first batch of photos.

This should not happen. I wrote the solver and know it doesn't make guesses!

There probably is a bug somewhere in the solver where it thinks it found a rule that forces it either direction.

I will have to step through the solver to understand its reasoning.

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

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houdah
Hi!

I found the bug!

It was a typon in the "hidden pair in block" algorithm which runs only for "hard" puzzles.

The fix will be submitted to the AppStore tomorrow.

Thanks for reporting this.

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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