The New Sudoku Players' Forum

[tarek]

I harvested what I assume are all the pages from https://diuf.unifr.ch/pai/people/juillera/Sudoku/ (dead link) after searching through webarchive

I mirrored it locally and imo has some useful info. These can be hosted on this forum (as the programmers forum). I also would like to added it to the Sukaku Explainer GitHub wiki pages but I don't know hoe to imbed .htm files in them!

tarek

[1to9only]

I think there are only 3 files that may be of interest: FAQ.html, InterestingSudokus.html and SudokuEquiv.html - unless you've collected more!
The text can be extracted, and formatted using the markdown notation favored by the git readme (.md) and wikis.

[tarek]

I used an html to markdown online converter. Only minor text editing was required afterwards

Uploaded 4 pages to the project's wiki pages

The 1st page (with links to the rest) is at https://github.com/SudokuMonster/SukakuExplainer/wiki/SE121---Sudoku-Explainer

[RW]

Hi tarek,

I'm looking at this Disjoint Group + Diagonal puzzle in sukaku explainer 1.15.10:

000000000007000000000604003000000000510090034000000000600701000000000200000000000

After a few trivial moves we get here:

Code: Select all

+--------+--------------------------------------------------------------+--------+
| 12348  | 6        234589   12359    12358    35789    14589    124589 | 2578   |
+--------+--------+                                            +--------+--------+
| 1349   | 2458   | 7        139      258      3589     6      | 2458   | 1589   |
|        +--------+--------+                          +--------+--------+        |
| 1289     2589   | 1258   | 6        12578    4      | 158    | 125789   3      |
|                 +--------+--------+        +--------+--------+                 |
| 23489    234789   23489  | 1345   | 13457  | 6      | 1589     12589    2589   |
|                          +--------+--------+--------+                          |
| 5        1        6        8      | 9      | 2        7        3        4      |
|                          +--------+--------+--------+                          |
| 234789   23489    289    | 1345   | 1345   | 57     | 1589     125689   125689 |
|                 +--------+--------+        +--------+--------+                 |
| 6        234589 | 23458  | 7        23458    1      | 3458   | 4589     589    |
|        +--------+--------+                          +--------+--------+        |
| 1349   | 4578   | 13589    349      4568     3589     2      | 45678  | 1589   |
+--------+--------+                                            +--------+--------+
| 123478 | 234589   12589    23459    234568   589      134589   145689 | 15678  |
+--------+--------------------------------------------------------------+--------+

At this point it suggests a skyscraper and 'get all hints' only shows a bunch of turbot fishes. However, we have the following moves:

-Locked candidates 2 on diagonal (eliminate from rest of box 1)
-Locked candidates 6 on diagonal (eliminate from rest of box 9)
-Locked candidates 3 on diagonal (eliminate from rest of top left disjoint group)
-Locked candidates 1 on anti-diagonal (eliminate from rest of bottom left disjoint group)
-Locked candidates 7 in lower right disjoint group (eliminate from rest of diagonal)

How come these moves are not shown?

RW

Edit: seeing similar misses in other puzzles as well. It appears diagonals are not properly accounted for when checking locked candidates.
Edit 2: looking at the code, it seems it doesn't check diagonals for locked candidates at all...

[tarek]

Try this version 1.17.5

https://www.transfernow.net/VqOkWK052020

It uses generalized intersections amongst other techniques

tarek

[RW]

Thanks! That version correctly downgrades the puzzle from ER 4.3 to 2.7.

Btw. In the code I noticed it searches for locked candidates whenever potential positions >= 2. Should be enough to check only when cardinality is 2 or 3 (add 4 if window region involved). Maybe you already changed this in the new version.

RW

[tarek]

Thanks RW. I'll look into that when I start working on that project again.

tarek

[tarek]

In the code I noticed it searches for locked candidates whenever potential positions >= 2. Should be enough to check only when cardinality is 2 or 3 (add 4 if window region involved). Maybe you already changed this in the new version.

Looking at some recent examples … The genralized intersections (or generalized locked candidates if you prefer) may eliminate a candidate from a target cell(s) outside that region that sees all the locked candidates. I found examples of 7 cells from a single region that see the same cell (e.g. Disjoint Groups Asterisk X Sudoku where r8c8 for instance can see 7 of the asterisk group cells)

I'm not sure if I kept that as the upper limit or not. This upper limit is different from one variant too another and indeed on the current resolution state of the puzzle … I didn't put any dynamic limits and most likely it is either no upper limit or a fixed upper limit at 7 candidates

tarek

[tarek]

Sukaku Explainer 1.17.7 is released.
Only minor changes but I haven't come round to implementing the w-wing technique yet which I was hoping to do earlier this year.
The minor changes have accumulated over the past 7 months so decided to release.


Changes since last release:

Fixed minor bug in SudokuFrame options
Adjustments to Warning Hints reflecting variants
Minor Generator improvements
Updated Strong Links Turbot Fish with X-Loops/Rings
Added Ferz Non consecutive (FNC)
Added UVWXYZ and TUVWXYZ wing techniques
Fixed issue with default technique selection
Uniqueness can be used in Forbidden Pairs puzzles
Fixed windows regions highlighting
Fixed pencilmarks issue after loading sudoku from file
Update settings release after Fix #93 #94
Cosmetic Hint changes

With the introduction of the new solving techniques, the --techs option now needs 46 0/1 characters. Here are the default values:

Code: Select all

Default Vanilla  --techs=1111111111010111011111111011100111100111111111
Default Variants --techs=1111111110101110111111110111100111100111111111
v1.2.1 mode      --techs=1111000011010111011011011011000010100010111111 -G0 -U0

Tarek

[tarek]

Table showing "chaining" techniques names in long and short formats:

Code: Select all

Long Description        |Short Description
------------------------|----------------
Bidirectional Cycle     |BiCy
Bidirectional Y-Cycle   |BiYCy
Generalized X-Wing      |GXW
Bidirectional X-Cycle   |BiXCy
Turbot Fish             |TF
Forcing X-Chain         |FXC
Forcing Y-Chain         |FYC
Nishio                  |N
Dynamic                 |D
Multiple                |M
Cell                    |L
Region                  |R
Double                  |d
Contradiction           |C
Forcing Chain           |FC

[1to9only]

There's been some Star Wars themed puzzles posted recently.
So here is a SukakuExplainer that's a bit on the Dark Side!
Download from: here.



I used the FlatLaf - Flat Look and Feel from: here.
The FlatLaf source code is hosted on GitHub here: here.
These are the only changes I made to SudokuExplainer.java:

Code: Select all

11a12,13
> import javax.swing.UIManager.*;
> import com.formdev.flatlaf.*;
673,677c675,680
<             String lookAndFeelClassName = Settings.getInstance().getLookAndFeelClassName();
<             if (lookAndFeelClassName == null)
<                 lookAndFeelClassName = UIManager.getSystemLookAndFeelClassName();
<             UIManager.setLookAndFeel(lookAndFeelClassName);
<             Settings.getInstance().save();
---
> //          String lookAndFeelClassName = Settings.getInstance().getLookAndFeelClassName();
> //          if (lookAndFeelClassName == null)
> //              lookAndFeelClassName = UIManager.getSystemLookAndFeelClassName();
> //          UIManager.setLookAndFeel(lookAndFeelClassName);
> //          Settings.getInstance().save();
>             UIManager.setLookAndFeel( new FlatDarkLaf());
679c682,683
<             e.printStackTrace();
---
> //          e.printStackTrace();
>             System.err.println( "Failed to initialize new LookAndFeel");


[LCDM63]

Hi All,

I would like to know if there is a command line mode for the sudoku generator ?

[1to9only]

Hi All,
I would like to know if there is a command line mode for the sudoku generator ?

I posted an 'addon' some time back - see: http://forum.enjoysudoku.com/sukakuexplainer-addons-t37018.html#p293820
The 3rd line has the download link, and you must use that program. The post referenced above has usage info.
I don't think the generator is in anything else I've put out!!
Edit: The later version, SukakuExplainer v1.17.11 with Addons, also has the command line generator included.

[meghanhal1978]

I know of 2 implementations, one by Sunnie-Shine who created a new CellType class, and given cells cannot be modified, the other by myself (no new class, and given cells can be changed to pencilmarks) in private code which has yet to make it into any of my many SE variants.

[1to9only]

here: I know of 2 implementations, one by Sunnie-Shine who created a new CellType class, and given cells cannot be modified, the other by myself (no new class, and given cells can be changed to pencilmarks) in private code which has yet to make it into any of my many SE variants.

Wished there was a way to flag these users for deletion??