What is ODLK1?

BOINC-project ODLK1 continues to solve the problem of BOINC-project ODLK.
The project generates a database of canonical forms (CF) of diagonal Latin squares (DLS) of order 10 having orthogonal diagonal Latin squares (ODLS).
The necessary definitions for the theme can be found here:

Join ODLK1

User of the Day

User profile Profile Ousermaatre
Bonjour, je suis un cruncheur de l'Alliance Francophone. Je réside en Suisse. Il existe un site et un forum dédié à Boinc en français.


DB CF ODLS of order 11
I am officially opening a new project DB CF ODLS of order 11.

Some research on this project has already been done in the topic "ODLS of orders n>10"

Working theme created

Tomáš Brada helped me in my research.
See the topic "Diagonal Latin squares of order n>10"

The project has good software, which was created by Belyshev and Harry White.

At the moment I have a small database core containing 109025 CF ODLS.

I invite everyone to join the project.
I will consider your suggestions for launching a project on the BOINC platform.
16 Jan 2021, 7:19:07 UTC · Discuss

DB CF ODLS of order 9
I am officially opening a new project "DB CF ODLS of order 9" .
This is not a BOINC project yet, but a manual project. I have been working on a project for a long time on a PC.
But you can turn a manual project into a BOINC project if you want.

Here you will find the software you need
(small archive, 2.1 MB)

The software was created by Belyshev and Harry White.

This is the script that works for me

@echo off
copy TemporaryDLS9R1BdFd.txt input.txt
kanonizator_dlk9.exe < vvod1.txt
copy output.txt input.txt
ortogon_u.exe < Y.txt
copy /b rez.txt+mates.txt rez.txt

Before starting the script, you must write the starting DLS to the file DLS9R1BdFdLast.txt.
The starting DLS can be any SN DLS from any rule or any CF from the existing database.

The following programs are running in the process:
1. DLS9R1BdFdCP.exe, a program for generating CH DLK in the selected line, by Harry White;
2.kanonizator_dlk9.exe, program for SN DLK canonization, author Belyshev;
3. ortogon_u.exe, program for checking DLS on ODLS, by Belyshev.
The programs run on Windows.

The process can be looped.
The results are written to the file rez.txt.
For convenience, I copy the results from the file mates.txt, this is one of the output files of the program ortogon_u.exe.
Therefore, it is important: be sure to find all orthogonal DLSs to the squares obtained in the file rez.txt using the program ortogon_u.exe.
Then canonize all the results obtained.
And then the post-processing of the received CF ODLS (search for ODLS from ODLS) will already go.

In the archive you will find the file Variants_of_Diagonal.txt.
These are the rules (side diagonals) for the 9th order SN DLS.
I sent this file to Harry before he started writing the generator program.

You can generate SN DLS in any selected rule in any (reasonable) amount with the Harry DLS9R1BdFd.exe program, which you will also find in the archive.
Generation instructions are understandable at program requests.
If you have any questions, ask.

I posted a small database of CF ODLS for a long time here
In this initial part of the database, there are only 6795 CF ODLS.
At the moment, the database of CF ODLS compiled by me contains 24153 CF ODLS.
This is, of course, very little yet.
But it is difficult to get many solutions on one PC.

Please join the project!

For more detailed instructions, please contact me.
You can write in the subject
in the PM, as well as in the home box

And a very important question!
I ask everyone to report the known data on the CF ODLS database of the order of 9, if you know such data.
Excluding the results of the BOINC Rake Search project. Partially the results of this project are included in the database I compiled. The rest of the results can also be included.
10 Aug 2020, 7:50:53 UTC · Discuss


I'll be on holiday for 10/12 days from tomorrow without access to the server.

I hope that all goes fine as in the last months.

7 Aug 2020, 19:39:43 UTC · Discuss

Hardware problems
As Linux is almost perfect if you get the same problem two times in short time, that means that there is an hardware problem behind!

The first time I can think it was due to the 3 working people that add new devices in my network for having three more connection speed of actual one as they manage to add cables and move devices during the operation.. and after them you got a DB related problem into the server just 5 minutes after they gone...

But after having rebuild the DB from scratch (without losing any data) and get the same error..then it is an hardware error (maybe related to the system disk that manifest some operation degradation that should not happen with his young life)

Actually the DB is now moved onto the ODLK1 Boinc disk and this should stay good until the new disk arrived and I can move system to it (maybe in 15 days).

29 Oct 2019, 21:34:44 UTC · Discuss

The results of ODLK and ODLK1 projects as of January 1, 2019
Dear participants!

At the moment our database contains 5714925 unique CFs ODLS.
See message

All results are published.

Thank you very much for your work!
22 Jan 2019, 11:59:45 UTC · Discuss

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