The New Sudoku Players' Forum

[Maq777]

Reviewing the information about the Shidoku in the Sudopedia I found the following errors

http://sudopedia.enjoysudoku.com/Shi_Doku.html

The first one is the count of essentially different puzzles
---Error: 4800 essentially different puzzles
---Correction: 4710 essentially different puzzles

The second error is in the counting of the problems
---Error: 13,581,312 valid puzzles of which 85,632 are minimal
---Correction: 13,579,680 valid puzzles of which 85,632 are minimal

The third error is in the first column (#1) of the following table where the final result must be 41401
---Error:

Code: Select all

                          Ordered
           Ordered    |  & Minimal  |
Clues   All Puzzles   |   Puzzles   |
        ------------  | ----------- |
          #1      #2  |  #1    #2   |
16         1       1  |   0     0   |
15        16      16  |   0     0   |
14       120     120  |   0     0   |
13       560     560  |   0     0   |
12      1812    1816  |   0     0   |
11      4272    4320  |   0     0   |
10      7480    7744  |   0     0   |
 9      9696   10560  |   0     0   |
 8      9064   10890  |   0     0   |
 7      5760    8272  |   0     0   |
 6      2209    4320  |  16     0   |
 5       416    1280  | 256   176   |
 4        12     128  |  12   128   |
        ----   -----  | ---   ---   |
Total  41418   50027  | 284   304   |


---Correction:

Code: Select all

                          Ordered
           Ordered    |  & Minimal  |
Clues   All Puzzles   |   Puzzles   |
        ------------  | ----------- |
          #1      #2  |  #1    #2   |
16         1       1  |   0     0   |
15        16      16  |   0     0   |
14       120     120  |   0     0   |
13       560     560  |   0     0   |
12      1812    1816  |   0     0   |
11      4272    4320  |   0     0   |
10      7480    7744  |   0     0   |
 9      9696   10560  |   0     0   |
 8      9064   10890  |   0     0   |
 7      5760    8272  |   0     0   |
 6      2208    4320  |  16     0   |
 5       400    1280  | 256   176   |
 4        12     128  |  12   128   |
        ----   -----  | ---   ---   |
Total  41401   50027  | 284   304   |


Best Regards

[Maq777]

Some of my calculations, excuse the column titles in Spanish, I think it is still understood

https://github.com/MiguelQuinteiro/ImagenesSudoku/blob/master/Problemas%20Irreductibles.png

https://github.com/MiguelQuinteiro/ImagenesSudoku/blob/master/Todos%20los%20Problemas.png

[JPF]

Errors in Sudopedia...

It's true, but you should have a look at the following posts of Ed Russell = Red Ed and Sourendu Gupta = sg (2006)
You will find all the right numbers.
Red Ed
sg
Gupta's website on Sudoku

JPF

[Maq777]

Errors in Sudopedia...

Gupta's website on Sudoku

JPF

Greetings JPF

Here it is seen that they corrected the total of the column, but they did not correct all the data of it.

The total is 41.401 and that is fine, but the calculations for clues 4 and 5 are still wrong.

Just notice in case they want to correct, since they are the obligatory reference of all of us who are now working and investigating on this.