The New Sudoku Players' Forum

by **philvo** » Mon Jul 04, 2022 3:16 pm

Hello,
a new generator+solver for sudoku and X-sudoku size 4x4, 6x6, 9x9, 12x12, 16x16 is downloadable on http://sudokugeant.cabanova.com . Developped with EXCEL, it can generate 10e+25 16x16 grids with 5 difficulty levels and 4 types of symmetry and solves the hardest 9x9 sudoku that I have found.
Thank you for your visit and comments.
Phil

by **ApoMarn** » Thu Jul 14, 2022 2:46 pm

I got a 'Dangerous Site' message when I clicked on your link.

by **philvo** » Thu Jul 14, 2022 8:14 pm

Hello,
Thank you for your mail. My site contains downloadable pdf files and Excel files with active macros. Maybe the message you received is due to these files.
I have checked the link to the site from the previous post. I did not get any message and I can display the different pages and download files.
Tell me if you have more data.
Regards, phil

by **philvo** » Sun Nov 27, 2022 12:16 pm

Hello,
The new version of sudoku generator on http://sudokugeant.cabanova.com contains several scanning modes to generate grids with different looks by favoring center, sides, diagonals ...
Example: for the same solution, sudokus generated with 3 scans:
...........17.86...52.9.18..6.815.2...56.94...7.243.5..48.2.56...64.79...........
.97.6.34.4..7.8..26...9...7.6.....2.2.5...4.1.7.....5.7...2...35..4.7..8.13.8.27.
.971.234.4..7.8..26..3.4..7364...729.........179...8567..9.1..35..4.7..8.135.627.
The new generator is extended to sudokus and X-sudokus size 4x4 to 36x36 (scanning modes are more ‘spectacular’ on large grids).
Phil

by **philvo** » Thu May 25, 2023 9:37 pm

Hello,
Version A3 of sudoku generator at http://sudokugeant.cabanova.com contains new functions, including :

an ‘upgrader’ to increase grid difficulty by removing excess cells :

Code: Select all: initial - level 3 upgraded to level 6 upgraded to level 20 . 7 3 . 5 . 6 1 . . 7 3 . . . 6 1 . . 7 3 . . . . 1 . 5 . . . . . . . 9 5 . . . . . . . 9 5 . . . . . . . 9 9 . 2 4 . 6 5 . 7 . . 2 4 . 6 5 . . . . 2 4 . 6 5 . . . . 7 3 . 5 9 . . . . 7 3 . 5 9 . . . . 7 3 . 5 9 . . 6 . . . . . . . 3 6 . . . . . . . 3 6 . . . . . . . 3 . . 9 7 . 4 1 . . . . . 7 . 4 . . . . . . 7 . 4 . . . 7 . 8 5 . 9 2 . 1 . . 8 5 . 9 2 . . . . 8 5 . 9 2 . . 2 . . . . . . . 5 2 . . . . . . . 5 2 . . . . . . . . . 9 5 . 7 . 8 6 . . 9 5 . 7 . 8 6 . . 9 5 . 7 . . . .

and a ‘transformer’ of symmetric grids to generate equivalent grids by keeping symmetry :

Code: Select all: initial transformed sudokus 3 . . 6 1 8 . . 5 . . 4 9 2 8 3 . . . 5 . . . . . 1 . 2 . . 9 . 6 . . 5 . . 9 . . . 7 . . 6 . . . . . . . 1 4 . . . 6 . . . 2 . . 4 . 1 . 9 . . . 6 . . . . . 8 . . 9 . . . . . 8 . . . 1 9 . 2 4 . . . 9 . . . . . 3 . 5 . . 1 . 7 . . 3 . . 3 6 . 2 4 . . . . 4 5 . 9 8 . . 3 . . 7 . 4 . . 9 . 4 . . . . . 1 . . 2 . . . . . 5 . . . 6 . . . 9 . . 5 . . . . . . . 4 6 . . 8 . 3 . . 4 . . 5 3 . 9 8 . . . . 7 6 . 4 3 . . 8 . . 5 . 2 . . 7 . 1 . . . . . 4 . . 5 . . . . . 2 . . . 9 1 . 7 5 . . . 6 . . . . . 2 . . . 6 . . . 5 . . 4 . . . . . . . 8 7 . . . 2 . . . 6 . . 1 . 4 . 7 . . 7 . . 9 3 2 . . 8 . . 9 7 3 1 6 . . . 3 . . . . . 7 . 7 . . 1 . 5 . . 6

transformer for 16x16 sudokus :

Hidden Text: Show

Code: Select all: . . . . 1 10 . . . . 16 4 . . . . . . 16 2 . . . . . . . . 5 1 . . . . 10 2 6 13 12 . . 1 8 5 11 4 . . 3 . . . . 7 14 . . 11 15 . . . . 4 . 14 4 . . . . 11 13 . . . . 8 6 . . 3 14 5 1 15 . . . . 10 4 16 9 13 . 10 4 . . . . 11 6 3 5 . . . . 8 14 9 6 . . . . 1 14 16 8 . . . . 11 3 9 4 12 11 10 . . . . . . 13 1 6 8 5 7 15 1 . . . . 9 14 . . . . 11 3 6 5 . . . . 8 12 16 1 3 4 . . . . 13 7 1 13 8 . . . . . . . . 2 12 15 10 16 8 5 14 . . . . . . . . 10 4 2 3 . . . . 15 10 2 13 5 6 7 16 . . . . 5 12 8 . . . . 10 3 . . . . 15 11 6 1 12 3 10 14 . . . . . . 13 8 5 6 15 . . . 15 1 11 3 5 4 14 8 13 6 . . . 1 16 . . . . 6 13 9 15 . . . . 3 12 . 6 13 15 3 2 . . . . 5 16 11 9 1 . . . 13 3 12 6 14 . . 9 15 2 1 7 . . 3 . . . . 7 8 . . 4 11 . . . . 14 . . 9 11 8 15 6 . . 4 10 3 14 13 . . . 10 6 14 16 7 . . . . 11 1 15 5 13 . . . . . 9 3 . . . . 12 8 . . . . . . 8 1 7 3 12 . . 15 9 10 4 14 . . . 11 5 7 8 4 . . . . 9 3 12 16 1 . . . . . 8 12 . . . . 13 16 . . . . . 10 14 4 5 6 . . . . 3 7 2 16 9 . . . 9 4 2 14 16 . . 15 10 7 11 13 . . 15 . . . . 11 7 . . 9 4 . . . . 1 13 9 7 3 4 . . . . . . 5 12 15 11 8 . . . 16 11 12 5 7 14 4 1 8 9 . . . 13 11 . . . . 1 2 10 7 . . . . 12 9 5 2 15 16 . . . . . . . . 6 3 7 10 . . . . 3 1 13 9 6 11 16 5 . . . . 12 2 4 . . . . 15 8 . . . . 11 6 13 8 13 10 . . . . 14 2 . . . . 6 16 9 15 . . . . 13 8 12 7 1 5 . . . . 9 8 7 5 13 . . . . . . . . 3 14 16 15 14 1 . . . . 5 3 10 13 . . . . 4 11 14 13 . . . . 15 1 11 2 . . . . 12 16 4 9 11 15 7 . . . . . . 3 12 1 2 8 15 . . . . 4 13 . . 9 11 . . . . 12 . 4 8 . . . . 10 15 . . . . 6 5 . . 10 3 16 12 5 . . . . 15 2 6 7 9 . . . . . 6 9 . . . . 1 14 . . . . . . 1 5 . . . . . . . . 14 15 . . . . 1 12 3 8 15 . . 14 7 9 13 5 . .

The generator is developed with EXCEL and applies to sudokus and X-sudokus size 4, 6, classic 9, 12, 16, 25, 36.
A solver is also available and solves all sudokus and X-sudokus size 9 (that I have found up to now).

The solver contains import/export functions with different formats. For instance :

Hidden Text: Show

phil

by **philvo** » Mon Jun 26, 2023 9:17 pm

Hello,
I added some features in the A4 version of sudoku solvers on http://sudokugeant.cabanova.com :
- a logger: detailed, reduced, by level
- a revised tracer: automatic, step by step, by level, by packet
- a manual pencil-like mode with undo-redo from 1 to N steps
The solvers are available for sudokus and X-sudokus size 4x4 to 36x36.
phil

by **philvo** » Tue Sep 05, 2023 12:39 pm

Hi,
I have added new scanning types in the generators downloadable at http://sudokugeant.cabanova.com
They now contain around 50 methods (+ 1 user-defined) for generating symmetric sudokus and X-sudokus size from 4x4 to 36x36.
For example :
sudoku 9x9 :

Code: Select all: . . . . 3 . . . . . . . . . . . . . 1 9 . . . . . 3 6 . . . . . . . . . . 7 . 5 . 2 . 1 . . 6 5 9 . 8 7 3 . . 4 8 . . . 7 9 . . . 4 1 . 6 8 . . . . 4 1 . 6 3 . . . 3 8 . 5 . 4 6 . . 5 . . . . . 1 . . 6 . 5 3 2 . 1 . . 8 1 . 7 . 4 6 . . 8 . 5 9 6 . 1 . . . 9 7 . 2 5 . . . 8 5 . 6 . 7 4 . 4 . . 6 . 8 . . 7 . . 1 7 . 2 9 . . . . . 6 4 9 . . . . 7 2 . 4 . 1 6 . . 6 7 . 1 . 8 9 . . 9 . 4 1 3 . 7 . . . 4 8 . 5 1 . . . 4 9 . 2 . 5 3 . . . 2 7 . 4 9 . . . 2 9 . 7 . 1 4 . . 8 . . . . . 4 . . 9 . 2 1 7 . 5 . . 9 . 8 . 5 . 4 . . 1 3 8 . 4 6 9 . . 2 5 . . . 9 7 . . . 1 6 . 9 2 . . . . . . 9 . . . . . . . . . . . . . 9 7 . . . . . 5 1 . . . . . . . . .

sudoku 16x16 :

Hidden Text: Show

Code: Select all: . . . . . . . . . . . . . . . . . 14 5 . 1 7 . . . . 15 8 . 13 10 . . . . 13 . . 5 15 1 4 . . 6 . . . 10 4 1 . 3 . . . . . . 6 . 15 7 11 . . 5 . 4 . 13 1 14 12 . 16 . 2 . . 16 15 9 2 6 . . . . . . 13 8 14 3 1 . . 1 14 . 10 . 9 7 . 5 . 4 16 . . . . 7 11 . . . . . . . . 9 12 . . . 5 . 2 . . 15 . . 6 . . 13 . 3 . 9 8 14 . . 5 . 13 4 . 1 . . 16 12 10 . 9 3 7 . 8 11 . . 15 13 . 1 5 10 . 5 . . . 15 . 8 . . 13 . 3 . . . 7 . 11 . 15 6 . . 3 10 . . 14 16 . 8 . . . . . . 4 12 9 14 16 8 . . . . . 1 . 10 6 . 13 9 12 8 3 11 . 15 4 . 7 . . . . 16 . 1 3 12 5 . 9 . . . . 16 . 11 4 . 15 10 13 3 7 12 . 9 8 . 14 . . . . 5 . 7 2 13 8 . 15 . . . . . 15 . 8 11 . . 4 6 . . 9 5 . 7 . . . . . . 1 10 14 7 6 2 . . . . . . 1 2 5 . 14 3 . . 16 15 . 11 13 6 . 7 . . . 11 . 4 . . 9 . 10 . . . 5 . 3 . 12 . . 16 . . 8 . . 2 . 15 . 6 2 10 . . 9 . 15 1 . 11 . . 3 8 4 . . 7 11 . 4 . 5 2 . 6 . 3 15 . . . . 11 7 . . . . . . . . 14 6 . . . . 9 . 15 . 6 14 13 11 . 7 . 1 . . 2 6 16 8 14 . . . . . . 7 11 9 1 13 . . . 1 . . 7 8 12 9 . . 14 . . . 15 1 4 . 8 . . . . . . 12 . 2 5 3 . . . . . . . . . . . . . . . . . 5 3 . 9 15 . . . . 6 16 . 7 4 .

sudoku 25x25 :

Hidden Text: Show

Code: Select all: . 7 22 21 1 12 14 8 2 . . . . . . . 17 18 10 16 23 3 6 15 . 25 . 23 8 9 17 . 18 10 . . . . . . . 12 11 . 15 13 14 20 . 19 12 11 20 13 4 5 9 . . . . . . . . . . . 6 1 25 22 10 2 17 18 2 15 . 24 7 . . . . . . . . . . . . . 13 4 . 8 16 1 10 5 6 14 . . . . . . 21 25 . 15 19 . . . . . . 12 24 7 18 5 14 12 11 . . . . . 10 . . . . . 19 . . . . . 25 17 22 13 9 . 7 . . . . . 5 . . 4 18 21 . . 6 . . . . . 16 . 12 15 18 . . . . . . 22 12 14 5 6 8 23 7 3 . . . . . . 4 2 24 3 . . . . 8 6 . 11 25 17 12 16 15 23 . 22 18 . . . . 14 7 . . . . . 21 . 7 14 . 22 11 13 10 9 . 5 17 . 20 . . . . . . . . . 14 . . 24 25 16 20 15 . 11 7 13 18 23 . . 9 . . . . . . . . 2 . 7 5 13 14 9 10 19 3 16 8 25 12 21 . 17 . . . . . . . . . . 12 20 3 8 . 18 . 24 . 2 11 4 5 . . . . . . . . . . 11 . 22 4 15 2 23 6 1 5 8 9 24 7 3 . 14 . . . . . . . . 8 . . 1 17 18 4 12 . 2 25 16 14 15 . . 22 . . . . . . . . . 8 . 10 12 . 17 21 25 18 4 . 13 16 . 11 . . . . . 8 10 . . . . 25 23 . 13 2 3 9 19 22 17 . 5 12 . . . . 18 11 23 17 . . . . . . 19 24 16 7 15 1 13 10 20 . . . . . . 5 25 1 . 19 . . . . . 18 . . 8 10 6 . . 22 . . . . . 4 . 21 14 13 4 9 . . . . . 15 . . . . . 21 . . . . . 6 3 17 10 11 4 8 10 . . . . . . 3 1 . 13 5 . . . . . . 21 25 19 22 2 24 13 . 19 20 . . . . . . . . . . . . . 12 3 . 14 6 5 7 1 5 23 20 18 16 . . . . . . . . . . . 22 25 2 17 13 8 4 16 . 9 3 25 13 . 19 8 . . . . . . . 23 1 . 5 24 18 12 . 20 . 22 14 18 6 25 11 2 24 . . . . . . . 8 13 9 3 15 1 7 10 .

phil

by **m_b_metcalf** » Tue Sep 05, 2023 3:51 pm

Thanks, phil, for these pretty puzzles. Do you ever manage to achieve minimal puzzles with that full symmetry?

Mike

by **philvo** » Tue Sep 05, 2023 6:07 pm

Thanks Mike.
The generator has a function to remove excess cells and maintain symmetry, but it does not guarantee that the puzzles will be minimal.
phil

by **m_b_metcalf** » Wed Sep 06, 2023 1:51 pm

philvo wrote:Thanks Mike.
The generator has a function to remove excess cells and maintain symmetry, but it does not guarantee that the puzzles will be minimal.
phil

Thanks. Of course, getting minimal puzzles with 32 clues is not easy, but possible:

Code: Select all: . . . . 7 . . . . . 7 . 4 . 6 . 8 . . . 6 2 . 3 9 . . . 9 3 . 4 . 5 6 . 5 . . 3 . 7 . . 4 . 6 4 . 5 . 7 1 . . . 1 7 . 8 6 . . . 2 . 6 . 5 . 3 . . . . . 3 . . . . ED=8.3/1.2/1.2, minimal

Mike

by **urhegyi** » Thu Sep 07, 2023 1:40 pm

There are even solutions without the use of GSP:

Code: Select all: +-------+-------+-------+ | . . . | . 7 . | . . . | | . 7 . | 9 . 6 | . 5 . | | . . 6 | 4 . 3 | 9 . . | +-------+-------+-------+ | . 1 3 | . 4 . | 5 6 . | | 5 . . | 3 . 7 | . . 4 | | . 6 4 | . 5 . | 7 8 . | +-------+-------+-------+ | . . 5 | 7 . 1 | 6 . . | | . 4 . | 6 . 5 | . 3 . | | . . . | . 3 . | . . . | +-------+-------+-------+ ....7.....7.9.6.5...64.39...13.4.56.5..3.7..4.64.5.78...57.16...4.6.5.3.....3.... ED=7.1/1.2/1.2, minimal

Play this puzzle online at the Daily Sudoku site

by **philvo** » Thu Sep 07, 2023 2:43 pm

Interesting and nice puzzles.
phil

by **urhegyi** » Fri Sep 08, 2023 11:08 am

Another one from Mike posted in another thread:

Code: Select all: . . . . 7 . . . . . 2 . 5 . 1 . 3 . . . 9 3 . 6 5 . . . 9 2 . 1 . 3 5 . 6 . . 7 . 3 . . 4 . 5 7 . 9 . 8 1 . . . 5 4 . 7 1 . . . 7 . 9 . 5 . 8 . . . . . 3 . . . . 32-clue, fully symmetric, minimal ....7.....2.5.1.3...93.65...92.1.35.6..7.3..4.57.9.81...54.71...7.9.5.8.....3.... ED=7.3/1.2/1.2

by **urhegyi** » Fri Sep 08, 2023 11:12 am

Now we have two 32 clues sudokus from Mike based on GSP(Gurth symmetrical placement) and one from me without it.

Code: Select all: ....7.....7.4.6.8...62.39...93.4.56.5..3.7..4.64.5.71...17.86...2.6.5.3.....3.... ED=8.3/1.2/1.2 Mike Metcalf ....7.....2.5.1.3...93.65...92.1.35.6..7.3..4.57.9.81...54.71...7.9.5.8.....3.... ED=7.3/1.2/1.2 Mike Metcalf ....7.....7.9.6.5...64.39...13.4.56.5..3.7..4.64.5.78...57.16...4.6.5.3.....3.... ED=7.1/1.2/1.2 Peter Urhegyi

Anyone capable to find more minimal 32 clues sudokus with the same layout?

by **m_b_metcalf** » Fri Sep 08, 2023 11:44 am

urhegyi wrote:Anyone capable to find more minimal 32 clues sudokus with the same layout?

Code: Select all: . . . . 5 . . . . . 4 . 6 . 1 . 7 . . . 6 4 . 2 8 . . . 6 3 . 1 . 5 2 . 7 . . 2 . 8 . . 3 . 8 4 . 9 . 7 6 . . . 2 8 . 5 6 . . . 3 . 9 . 6 . 5 . . . . . 4 . . . . ED=1.5/1.2/1.2 . . . . 7 . . . . . 8 . 5 . 6 . 7 . . . 4 2 . 3 6 . . . 6 1 . 8 . 2 5 . 2 . . 4 . 5 . . 8 . 4 8 . 2 . 9 6 . . . 6 7 . 8 5 . . . 3 . 6 . 4 . 2 . . . . . 3 . . . . ED=7.2/1.2/1.2

and a couple more with identical ratings.

Mike

The New Sudoku Players' Forum

Generator for sudoku and X-sudoku size 4x4 to 16x16

Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16

Re: Generator for sudoku and X-sudoku size 4x4 to 16x16