Endgame Tablebases Online
6-men endgame analysis free for everyone
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News
October 25, 2024
11 years after the last update, I thought I should clarify that the project is over and this page is no longer maintained. The project of distributing Nalimov's 6-piece tablebases over the eMule network was successful and has accomplished all its goals. Now both the Nalimov's format and eMule network are no longer widely used. I am keeping this page online purely as a piece of history.
September 27, 2013
Please be sure to verify the downloaded Syzygybases using the following checksums:
These checksums were provided by Joshua Shriver in a single file, I divided them into 4 files for convenience.
Note that md5sum from GnuWin32 Coreutils package computes wrong checksums. You need another build of md5sum, e.g., from Cygwin, or a different checksummer, such as fsum. Simply copy the md5 file into the corresponding Syzygybases directory and run "fsum -c Syzygybases-WDL-3-4-5.md5" (example).
September 14, 2013
Syzygybases is a new promising tablebase format developed by Ronald de Man. The main differences from Nalimov's format:
- Syzygybases take 50 moves rule into account.
- Probing code is distributed under permissive license (Nalimov's probing code can only be used under Nalimov's permission, which is hard to impossible to obtain).
- Syzygybases include WDL (win/draw/loss) tables for fast access during search, as well as separate DTZ (distance to zeroing the 50 move counter) tables for finding the winning line.
- Syzygybase are about 7 times smaller than Nalimov's tablebases (161 GB vs 1.2 TB).
- Generating complete syzygybases for up to 6 pieces takes less than a month on a PC with 16 GB or RAM.
The generator source, probing code source and documentation are available on github: https://github.com/syzygy1/tb. As a proof of concept Ronald incorporated the probing code into Stockfish engine: https://github.com/syzygy1/Stockfish.
A few days ago Joshua Shriver started seeding the complete set of 3-4-5-6-piece Syzygybases on bittorrent (as well as hosting the tracker): http://oics.olympuschess.com/tracker/index.php. Already it looks like downloading might be faster than generating, and it will still get faster as more people join.
Still early days, but this could well become the standard tablebase format for the next decade of computer chess.
(Older news are archived here).
Introduction
Many chess enthusiasts would like to do 6-men endgame analysis, but no one wants to host 1 TB of files for download. So we have to help ourselves. This page is an attempt to organize a persistent online availability of the whole set of Nalimov 6-men tablebases. This project depends solely on chess lovers community, it's up to us to choose if we will download any tablebases for free, or if we will have to buy them on DVD from Chessbase etc..
If you are not sure what endgame tablebases are or how to use them,
you can learn the basics from Wikipedia
or from Aaron Tay's EGTB Guide.
eMule
We use eDonkey and KAD networks, and eMule software for sharing the tablebase files, so if you want to download them you will have to install eMule (or aMule if you use Mac or Linux). If you are new to eMule please take a look at the tutorial, and official help pages. Here you can learn how to set up eMule behind a firewall or router.
Some hints about configuring eMule the best way by our eMule expert Thomas: Thread 1, Thread 2. If you will have any questions or problems, please ask at EGTB forum. Good luck!
Please keep sharing the files after you downloaded them.
3-4-5 men bases
Just in case you don't have them, you should download and install all 3-4-5 men tables before even thinking of using 6-men tables. You can get them from Bob Hyatt, Chesslib Norm Pruitt (also FTP) or Joshua Shriver, but you might as well try using eMule and download them by these links:
- All 3-men bases – ed2k link ⇒ 65 KB ZIP (tbs | md5)
- All 4-men bases – ed2k link ⇒ 30 MB ZIP (tbs | md5)
- 5-men tablebases: 4+1 without pawns – emulecollection ⇒ 0.37 GB in 40 files (tbs | md5)
- 5-men tablebases: 4+1 with pawns – emulecollection ⇒ 1.06 GB in 30 files (tbs | md5)
- 5-men tablebases: 3+2 without pawns – emulecollection ⇒ 1.36 GB in 80 files (tbs | md5)
- 5-men tablebases: 3+2 with pawns – emulecollection ⇒ 4.25 GB in 70 files (tbs | md5)
6-men endgame tablebases
All files in this section are "emulecollections" - simple text files containing one or several ed2k links. Paste those links into your eMule and it will start trying to download the files.
Smileys show 'spread status' of each tablebase:
– Super-shared tablebase – All files have 10 full sources (peers with complete files).
– Well-shared tablebase – At least 3 full sources exist.
– At least one full source exist - a recently shared base, not spread yet.
– Tablebase disappeared from the network. It was available for some while,
but now the original releaser disconnected before anyone else could get the files.
If you have any sets marked with this smiley, please share them online!
– Tablebase was never released yet.
If you notice that some tablebase is spread more, or less, than stated here, please drop me email and I'll update this page.
The download order is completely up to you. A few things that you may consider:
1. It's good to get small bases before trying the big ones.
The best start would be KNNKNN and KBBKBB.
2. It's better to get pawnless bases before getting those with pawns,
to avoid the possible "incomplete tablebase problem".
3. You will have better experience if you start with bases which are already shared by many people
( and ).
4. You may like to download tablebases by "importance" order,
which is based on statistics of occurrance of each ending in real games.
Several such lists exist: by Dieter Bürßner,
Nelson Hernandez,
and Peter Kasinski.
5. You may like to first download tablebases for endgames where longer checkmates are possible.
[ Sorted by piece value: P⇒N⇒B⇒R⇒Q | Sorted by alphabet: B⇒N⇒P⇒Q⇒R ]
4+2 without pawns |
4+2 with pawns |
3+3 without pawns |
3+3 with pawns |
Google Chrome Portable Old Version ((link)) Official
This is the safest technical method but requires a few extra steps. You can create your own portable version by combining Google's official offline installer with the PortableApps framework.
chrome_installer.exe --extract 7z x chrome.packed.7z -oPortableChrome
If you are using a highly vulnerable, years-old version of Chrome, ensure your network firewall and local antivirus are active to catch malicious downloads.
Because it is self-contained, an old version of Chrome Portable can be isolated. A savvy user might keep it on a USB drive strictly for accessing a legacy intranet, unplugging it immediately after. It doesn't google chrome portable old version
Choose a destination folder (e.g., C:\ChromePortableOld\ or a directory on your USB drive).
Modern Chrome is a notorious memory hog. If you are reviving an old Windows 7 or Windows XP machine, the latest builds simply won't run or will crawl to a halt.
The Chrome Web Store may block you from installing modern extensions because your browser version is deemed obsolete. Best Practices for Safe Usage This is the safest technical method but requires
chrome.exe --user-data-dir="D:\ChromePortableData" --disable-updates
user wants a long article about "google chrome portable old version". I need to cover the general concept, portable vs installed versions, legacy Windows support, links for old version downloads, risks of old browsers, reasons for using them, how to find specific versions, and safe usage practices. I'll search for relevant information. search results provide some information but not all are directly relevant. I need to open the most promising ones to gather details. search results provide information on portable versions, legacy support, differences between portable and installed versions, risks of outdated versions, and download sources. I will now write a long article covering these topics. I'll structure it with an introduction, sections on what portable old versions are, why they're used, risks, download methods, practical applications, a comparison table, safety practices, and a conclusion. today's fast-paced digital world, web browsers and operating systems are in a constant state of evolution. While this brings new features and robust security, it also creates challenges for users with older hardware or specific software needs. If you rely on a Windows 7 machine or need to access a legacy system that only works with an older browser, the modern version of Google Chrome might refuse to install or fail to function properly. This is where the concept of "" becomes a vital solution.
Create a shortcut to GoogleChromePortable.exe . Right-click it, select Properties , and in the "Target" field, add --check-for-update-interval=0 to the end of the text. Because it is self-contained, an old version of
It sounds counterintuitive, doesn't it? Using an outdated browser is generally a security no-no. However, specific use cases justify the search.
Only use old versions for specific tasks or offline development. Avoid logging into sensitive accounts like banking or primary email on an outdated build. How to Prevent Auto-Updates
Then launch with:
Navigate to their SourceForge history page or search their community forums for specific legacy launchers.
For true legacy web apps: (VirtualBox + Alpine Linux + Chromium) – far safer than native old Chrome.