interesting human solvable puzzle

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interesting human solvable puzzle

Postby urhegyi » Mon Sep 20, 2021 3:07 pm

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Re: interesting human solvable puzzle

Postby urhegyi » Mon Sep 20, 2021 4:09 pm

The last available version of SukakuExplainer seems to have some problems generating in the fiendish range when diagonals are involved.
Interested to know if the private version 2021.6.17 of 1to9only can produce more of them.
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Re: interesting human solvable puzzle

Postby 1to9only » Mon Sep 20, 2021 4:52 pm

urhegyi wrote:2021.6.17

A new version is to be released in the coming days. Not sure if this will improve generation of fiendish/diabolical variant X sudokus.
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Re: interesting human solvable puzzle

Postby 1to9only » Mon Sep 20, 2021 5:12 pm

urhegyi wrote:problems generating in the fiendish range when diagonals are involved

The original SudokuExplainer (1.2.1.3) and this SukakuExplainer (2021.4.7 and later) do NOT check for Nested Forcing Chains (even when generating vanilla sudokus), so the max generated ED is in the 9.0-10.0 range. I think old SE did this to speed up sudoku generation (in the days of slower computing some 12 years ago!).
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Re: interesting human solvable puzzle

Postby urhegyi » Mon Sep 20, 2021 6:59 pm

After the first example which was human solvable now another one confirming the maximum rating possible for computer solving.
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Re: interesting human solvable puzzle

Postby 1to9only » Mon Sep 20, 2021 8:25 pm

urhegyi wrote:After the first example which was human solvable now another one confirming the maximum rating possible for computer solving.

No Nested Forcing Chains.

After the next release, I can build a special version with Nested Forcing Chains enabled and max ED=12.x ratings - it will be slower generating sudokus. More details later.
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Re: interesting human solvable puzzle

Postby urhegyi » Tue Sep 21, 2021 9:03 am

No clues in extra regions nor in the diagonals:
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Last edited by urhegyi on Thu Sep 23, 2021 8:23 pm, edited 1 time in total.
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Re: interesting human solvable puzzle

Postby 1to9only » Wed Sep 22, 2021 5:17 pm

It is possible to generate very hard puzzles. Here's are a few examples (same layout as above Custom-X sudokus):

Code: Select all
.......8....................6......3.5....1.2...............................5.49. ED=10.6

5 x Dynamic Contradiction Forcing Chains (+ Forcing Chains) (10.4-10.6)

Code: Select all
.................3.5.........9.......................81.....6....5.4..2.......... ED=11.6

18 x Dynamic Contradiction Forcing Chains (+ Forcing Chains) (10.1-10.9)
3 x Dynamic Region Forcing Chains (+ Forcing Chains) (10.2-10.4)
13 x Dynamic Contradiction Forcing Chains (+ Multiple Forcing Chains) (11.1-11.6)

Code: Select all
...5...............3..4...........83.........1..7....6........................2.. ED=12.0

18 x Dynamic Contradiction Forcing Chains (+ Forcing Chains) (10.3-10.9)
23 x Dynamic Contradiction Forcing Chains (+ Multiple Forcing Chains) (11.0-11.5)
9 x Dynamic Contradiction Forcing Chains (+ Dynamic Forcing Chains) (11.8-12.0)
1 x Dynamic Region Forcing Chains (+ Dynamic Forcing Chains) (11.8)

Code: Select all
...5...2......................8..7..................3............9.6....2.4...... ED=12.2

15 x Dynamic Contradiction Forcing Chains (+ Forcing Chains) (10.3-10.9)
2 x Dynamic Region Forcing Chains (+ Forcing Chains) (10.4-10.6)
1 x Dynamic Cell Forcing Chains (+ Forcing Chains) (10.6)
1 x Dynamic Region Forcing Chains (+ Multiple Forcing Chains) (11.4)
5 x Dynamic Contradiction Forcing Chains (+ Multiple Forcing Chains) (11.5-11.6)
4 x Dynamic Region Forcing Chains (+ Dynamic Forcing Chains) (11.7-11.8)
32 x Dynamic Contradiction Forcing Chains (+ Dynamic Forcing Chains) (11.8-12.2)
1 x Dynamic Cell Forcing Chains (+ Dynamic Forcing Chains) (12.0)

There will be 1 new release only, in a few days!
Generating these hard puzzles will tie up your computer (100% CPU usage) for minutes/hours!!
It's really about implementing a new feature that you can use at your own risk (your comp becoming sluggish!).
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SukakuExplainer (2021.9.23)

Postby 1to9only » Thu Sep 23, 2021 4:03 pm

Download SukakuExplainer (2021.9.23) from here.
Use new option 'Generate (NFC enabled, can use 100% CPU)...', select 'Diabolical' and 'Exact difficulty' for very hard sudokus.
'Generate...' is unchanged.

Edit1: 'Exact difficulty' has no effect, as Min and Max EDs are not used with this Generate option.

Edit2: The command-lines: serate, hints, pencilmarks, solve don't work with custom (extra regions) sudokus. I hope to fix this soon.
Last edited by 1to9only on Thu Sep 23, 2021 8:06 pm, edited 1 time in total.
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8-clues Custom-X

Postby 1to9only » Thu Sep 23, 2021 5:26 pm

Code: Select all
..8...3.1.........................4......7.............9.................2.....5. ED=11.4/11.4/2.8
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Re: 8-clues Custom-X

Postby urhegyi » Thu Sep 23, 2021 8:26 pm

1to9only wrote:
Code: Select all
..8...3.1.........................4......7.............9.................2.....5. ED=11.4/11.4/2.8

Already found an example with 9 clues. Nice to know that a minimal 8 clue example is also possible.
No command line option for custom extra regions sudoku. Nice it will be fixed in a future release.
Edit:
Sometimes when generating fiendish custom X-sudokus, the generator stops working. It's hard to generate ratings around SE 2.8/2.9.Suggestion: add a possibilty to capture the errorstream from the command line(debug modus) so that can be found out what's happening.
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Re: 8-clues Custom-X

Postby 1to9only » Fri Sep 24, 2021 8:26 am

urhegyi wrote:Sometimes when generating fiendish custom X-sudokus, the generator stops working.

There are a few problems (amongst, a NullPointerException sometimes!) which I encounter every now and then.
I tend to ignore these, kill the Java VM from the Task Manager if needed, and restart the GUI.

urhegyi wrote:It's hard to generate ratings around SE 2.8/2.9.

Fiendish puzzles are in 2.6-6.0 range, I would expect some puzzles at the lower end to be generated every now and then.
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Re: 8-clues Custom-X

Postby urhegyi » Fri Sep 24, 2021 9:56 am

1to9only wrote:
urhegyi wrote:Sometimes when generating fiendish custom X-sudokus, the generator stops working.

There are a few problems (amongst, a NullPointerException sometimes!) which I encounter every now and then.
I tend to ignore these, kill the Java VM from the Task Manager if needed, and restart the GUI.

urhegyi wrote:It's hard to generate ratings around SE 2.8/2.9.

Fiendish puzzles are in 2.6-6.0 range, I would expect some puzzles at the lower end to be generated every now and then.

The nullpointers i'm experiencing often with diagonals. In case of extra regions without them it works fine.
Yesterday I tried to generate a hard one instead of a fiendish one. It stopped after a long time and a memory use over 4.2 GB.
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Re: interesting human solvable puzzle

Postby urhegyi » Mon Sep 27, 2021 1:41 pm

It took some time to test the new funcionality built in the newest version of sukakuexplainer to generate the highest rated puzzles:
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Re: interesting human solvable puzzle

Postby 1to9only » Tue Sep 28, 2021 8:55 am

New version (2021.9.28) of SukakuExplainer, see post here: http://forum.enjoysudoku.com/help-with-sudoku-explainer-t6677-270.html#p310348
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