Extra regions sudoku

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Extra regions sudoku

Postby urhegyi » Wed Nov 25, 2020 3:32 pm

image removed
Last edited by urhegyi on Tue Dec 29, 2020 12:02 pm, edited 1 time in total.
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Re: Extra regions sudoku

Postby 1to9only » Wed Nov 25, 2020 11:13 pm

The above extra regions sudoku, difficulty: Easy, singles only, ED=1.2:
Code: Select all
..62.7.....94.6.7.....51..95.....48..9.....3..73.....66..91.....4.5.21.....6.89.. 122211333122211444122211444555666444555666333777666333777889998777889998555889998 JSB

SumoCueV1=0J0=0J1=6J1=2J1=0J0=7J0=0J2=0J2=0J2=0J0=0J1=9J1=4J1=0J0=6J0=0J3=7J3=0J3=0J0=0J1=0J1=0J1=5J0=1J0=0J3=0J3=9J3=5J4=0J4=0J4=0J5=0J5=0J5=4J3=8J3=0J3=0J4=9J4=0J4=0J5=0J5=0J5=0J2=3J2=0J2=0J6=7J6=3J6=0J5=0J5=0J5=0J2=0J2=6J2=6J6=0J6=0J6=9J7=1J7=0J8=0J8=0J8=0J7=0J6=4J6=0J6=5J7=0J7=2J8=1J8=0J8=0J7=0J4=0J4=0J4=6J7=0J7=8J8=9J8=0J8=0J7

+---+-----------+-------+-----------+
| . | .   6   2 | .   7 | .   .   . |
|   |           |       +-----------+
| . | .   9   4 | .   6 | .   7   . |
|   |           |       |           |
| . | .   .   . | 5   1 | .   .   9 |
+---+-------+---+-------+           |
| 5   .   . | .   .   . | 4   8   . |
|           |           +-----------+
| .   9   . | .   .   . | .   3   . |
+-----------+           |           |
| .   7   3 | .   .   . | .   .   6 |
|           +-------+---+-------+---+
| 6   .   . | 9   1 | .   .   . | . |
|           |       |           |   |
| .   4   . | 5   . | 2   1   . | . |
+-----------+       |           |   |
| .   .   . | 6   . | 8   9   . | . |
+-----------+-------+-----------+---+

The extra regions, numbered 1-9:
Code: Select all
+---+-----------+-------+-----------+
| 1 | 2   2   2 | 1   1 | 3   3   3 |
|   |           |       +-----------+
| 1 | 2   2   2 | 1   1 | 4   4   4 |
|   |           |       |           |
| 1 | 2   2   2 | 1   1 | 4   4   4 |
+---+-------+---+-------+           |
| 5   5   5 | 6   6   6 | 4   4   4 |
|           |           +-----------+
| 5   5   5 | 6   6   6 | 3   3   3 |
+-----------+           |           |
| 7   7   7 | 6   6   6 | 3   3   3 |
|           +-------+---+-------+---+
| 7   7   7 | 8   8 | 9   9   9 | 8 |
|           |       |           |   |
| 7   7   7 | 8   8 | 9   9   9 | 8 |
+-----------+       |           |   |
| 5   5   5 | 8   8 | 9   9   9 | 8 |
+-----------+-------+-----------+---+

Here's a slightly more difficult one, level: Medium, ED=3.0:
Image
Code: Select all
7.8...6.......4.1..6.2..5...............................4..1.9..2.9.......1...4.3 122211333122211444122211444555666444555666333777666333777889998777889998555889998 JSB

SumoCueV1=7J0=0J1=8J1=0J1=0J0=0J0=6J2=0J2=0J2=0J0=0J1=0J1=0J1=0J0=4J0=0J3=1J3=0J3=0J0=6J1=0J1=2J1=0J0=0J0=5J3=0J3=0J3=0J4=0J4=0J4=0J5=0J5=0J5=0J3=0J3=0J3=0J4=0J4=0J4=0J5=0J5=0J5=0J2=0J2=0J2=0J6=0J6=0J6=0J5=0J5=0J5=0J2=0J2=0J2=0J6=0J6=4J6=0J7=0J7=1J8=0J8=9J8=0J7=0J6=2J6=0J6=9J7=0J7=0J8=0J8=0J8=0J7=0J4=0J4=1J4=0J7=0J7=0J8=4J8=0J8=3J7

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Re: Extra regions sudoku

Postby urhegyi » Thu Nov 26, 2020 11:59 am

There seems to be something strange with both examples. When not adding the normal blocks of sudoku the jigsaws still have a unique solution. Further examinations follow.
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Re: Extra regions sudoku

Postby 1to9only » Thu Nov 26, 2020 2:00 pm

urhegyi wrote:There seems to be something strange with both examples. When not adding the normal blocks of sudoku the jigsaws still have a unique solution. Further examinations follow.

Some JSB (Jigsaw with Blocks) will also solve as JS (Jigsaw) - the two sudokus posted are examples of this.
The layout helps! I've found this is not always true with other more irregular jigsaws!
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Re: Extra regions sudoku

Postby urhegyi » Thu Nov 26, 2020 3:13 pm

2020-11-26 (4).png
2020-11-26 (4).png (104.3 KiB) Viewed 382 times
Third example in a row: solvable as JS or as JSB.
Now I can say that because the pair 5/7 is locked at R12C56, 7 can't be in the rest of the block which is R3C1, so R3C1 must be 8!
Last edited by urhegyi on Thu Nov 26, 2020 5:30 pm, edited 1 time in total.
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Re: Extra regions sudoku

Postby urhegyi » Thu Nov 26, 2020 4:52 pm

1to9only wrote:
urhegyi wrote:There seems to be something strange with both examples. When not adding the normal blocks of sudoku the jigsaws still have a unique solution. Further examinations follow.

Some JSB (Jigsaw with Blocks) will also solve as JS (Jigsaw) - the two sudokus posted are examples of this.
The layout helps! I've found this is not always true with other more irregular jigsaws!

But the question stays if all jigsaws generated with this specific layout and unique solution can be solved as a JSB too, on a way which is easier as without the sudoku blocks.
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Re: Extra regions sudoku

Postby urhegyi » Thu Nov 26, 2020 10:51 pm

2020-11-26 (6).png
2020-11-26 (6).png (100.52 KiB) Viewed 360 times
I generated another one as JS, with or without blocks they keep having max rating 1.7.
Perhaps they can be made harder by asking for symmetry like in the example with ER 3.0?
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Re: Extra regions sudoku

Postby urhegyi » Thu Nov 26, 2020 11:13 pm

I tried another format:
Last edited by urhegyi on Wed Dec 30, 2020 5:23 pm, edited 1 time in total.
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Re: Extra regions sudoku

Postby urhegyi » Thu Nov 26, 2020 11:15 pm

solution:
Last edited by urhegyi on Wed Dec 30, 2020 5:24 pm, edited 1 time in total.
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Re: Extra regions sudoku

Postby urhegyi » Mon Nov 30, 2020 10:39 am

Two more JSB examples.
Can 1to9only explane me how he has added the 9 normal sudoku boxes on the picture posted with his medium level example with the 3.0 rating? (The lines around them)
The first I did completely by hand and found it solves with 2 generalized intersections. When checking with the program it gives 6 of them, but you don't need them all because of the symmetrical form of the solution. The second is more difficult and was generated by the program without any extra symmetry in the solution.
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Re: Extra regions sudoku

Postby urhegyi » Mon Nov 30, 2020 10:40 am

more-diff.png
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Re: Extra regions sudoku

Postby urhegyi » Mon Nov 30, 2020 10:41 am

most-diff.png
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Re: Extra regions sudoku

Postby 1to9only » Mon Nov 30, 2020 11:06 am

urhegyi wrote:Can 1to9only explane me how he has added the 9 normal sudoku boxes on the picture posted with his medium level example with the 3.0 rating? (The lines around them)

JSBs up till now were displayed grey and white - I recently added color - this is not in the last pre-release. I've not looked at the code for about a week now. The project is in the slow lane, as I think you're the only one downloaded/using the JigsawExplainer. I'll check its status and maybe put out another pre-release! Maybe later today, or tomorrow.
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Re: Extra regions sudoku

Postby 1to9only » Tue Dec 01, 2020 10:17 am

1to9only wrote:I'll check its status and maybe put out another pre-release!

SudokuJigsawExplainer.jar - 1 Dec 2020 - PRE-RELEASE
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Re: Extra regions sudoku

Postby urhegyi » Tue Dec 01, 2020 11:23 am

1to9only wrote:
1to9only wrote:I'll check its status and maybe put out another pre-release!

SudokuJigsawExplainer.jar - 1 Dec 2020 - PRE-RELEASE

I sent you a private message yesterday about your last version containing a bug report. I will check your new version later today.
Edit : new version contains the same bug.
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