The hardest sudokus (new thread)

Everything about Sudoku that doesn't fit in one of the other sections

Re: The hardest sudokus (new thread)

Postby Paquita » Tue Nov 20, 2018 9:32 am

After a rocky start I now am busy trying to find hard sudokus.

So far, I found this (SE rates)

98.7.....7...6.9....5..9.7.5....6.8...4.3.6.....2....1.5...7.4....6....3....1.2.. 11.7;11.7;6.6
Thanks to champagne for learning me some things I needed, like the canonical form.
I also found some with probable lower rates, that I yet have to rate with SE, those may follow in a later post
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Re: The hardest sudokus (new thread)

Postby champagne » Thu Dec 06, 2018 11:08 am

I prepared a new update of the data base

as for all new files , that update is in my "google drive space" with the name ph_807.zip

the link to that storage place is here


The file contains now 2 048 264 puzzles (1 959 402 in the former release)

The main facts in between are:
. the cleaning of wrong entries out of files sent by David Filmer in a format open to manual errors in the updating process (I fell in the trap)
. entry of a new supplier paquita. Again, some difficulties at the start to be in the right format, but the 133 added puzzles have been carefully checked.
paquita additions rate 11.4 to 11.8, (1x11.8 2x11.7).
. several additions out of private cache in the recent pattern games (Dobrichev, Robbie, Papy999 and me)
. update of the transfer of games puzzles
. Addition in the 26 clues area made by me





the count per clue in the data base is now the following
Code: Select all
clues   CompteDeclues
20   79
21   10960  +18
22   88276  +237
23   393651 +597
24   704724 +1893
25   445719
26   404613


The 24 clues area has been reasonably searched,
a lot of work has still to be done with 25 26 clues to reach the same level.



The count per er is the following
Code: Select all
er   CompteDeer
11.9   9      -1
11.8   54     0
11.7   116    +2
11.6   252    +62
11.5   614    +32
11.4   1505   +79   
11.3   8907   +307


The top entries have been cleaned from wrong additions and "paquita" added new puzzles

and the combined table is the following

Code: Select all
clues   20    21     22    23      24      25      26
11.9    1      5      3         
11.8    1     15     29     9         
11.7   31     51      9    16       8       1
11.6    1     38     52    51      87      17       6
11.5          46    101   159     177      90      41
11.4    1     30    305   396     361     173     140
11.3    1    629   1123  2195    2416    1109    1434
11.2    6    991   2721  5507    6707    3004    3459
11.1   12   1267   5106 16430   23194   11861   10532
       21   3148   9493 24759   32958   16262   15613




Note: The file is not yet seen in the google drive, I try to understand why
EDIT solved, once more a silent lock of a process by a pending windows 10 update
champagne
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Re: The hardest sudokus (new thread)

Postby champagne » Mon Dec 10, 2018 1:48 am

Warning for the use of the last PH files:

Testing the brute force on the files recently uploaded I have seen a problem in the canonical values.
The main file "01 file" is correct,
The canonical form (02index) is wrong(1% of the content), likely in lots extracted on my side from ACCESS (I know how this can appear)
I'll clean the data base and produce a next update beginning of 2019.
champagne
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