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1st October
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MatPlus.Net Forum Internet and Computing Does anyone have Lomonossov tablebases at home?
 
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(1) Posted by Siegfried Hornecker [Saturday, Aug 11, 2018 11:49]; edited by Siegfried Hornecker [18-08-11]

Does anyone have Lomonossov tablebases at home?


I'm curious, are the Lomonossov tablebases only available on the server of the Lomonossov university, or does anyone have them at home, i.e. are they safe for posteriority? Also, where do you find a 200 TB harddisk?

EDIT: Found the answer to the latter question on Wikipedia. Currently the biggest single harddisks have still under 20 TB. So, a setup for the Lomonossov bases would be out of a reasonable price range for most people.
 
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(2) Posted by marcin kolodziejski [Saturday, Aug 11, 2018 12:10]; edited by marcin kolodziejski [18-08-11]

Siegfried,

I'm have for you, good information. The Lomonossov tablebases it's free for the phone :) I have it maby a two years. Attention: you must have access to the internet! :)
 
 
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(3) Posted by Siegfried Hornecker [Saturday, Aug 11, 2018 17:28]; edited by Siegfried Hornecker [18-08-11]

Dear Marcin,

I meant not over internet but as physical copy. Is there only the tablebase on their server (which can be accessed over internet), or is there a full backup that someone has at home?
I don't trust big corporations (or universities, for that matter) to prevent cultural goods anymore (see BBC and Doctor Who).
 
   
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(4) Posted by Eric Huber [Sunday, Aug 12, 2018 15:35]

For general information: the tablebases are not only available on the server of the Lomonosov university.

This site https://syzygy-tables.info/ powered by Ronald de Man's Syzygy endgame tablebases presents 7-piece tables generated by Bojun Guo.

For those interested in downloading the tablebases, see this mention on the same page:

 QUOTE 
Generating the tablebases requires time and resources. It is more efficient to download them via BitTorrent or from a mirror:
tablebase.sesse.net (fastest mirror, EU, not all 7-piece tables)
tablebase.lichess.ovh (complete mirror, EU)
Bojun Guo (ftp, China, original source of 7-piece tables)

 
   
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(5) Posted by Siegfried Hornecker [Sunday, Aug 12, 2018 19:01]

Very good, so they are safe!

Still I suggest we host them also on WFCC servers.
 
   
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(6) Posted by Geir Sune Tallaksen Østmoe [Sunday, Aug 12, 2018 23:34]

Thanks for the link! It looks like that tablebase doesn't cover all 7-men positions, though. I tested with two positions; the tablebase worked well for one of them, but with the other one, it said "Position not found in tablebases."

And the app mentioned does not exist for iPhone, as far as I know.
 
   
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(7) Posted by Arpad Rusz [Thursday, Aug 16, 2018 07:51]

Almost all 7-man Syzygy tablebases are available online:
https://syzygy-tables.info/endgames#7-pieces

Looks like the last tablebases will be generated in a week.

I have about 6.5TB of tablebases already downloaded (almost all 4v3 endgames), the total size seems around 9TB.
These are only the WDL (WinDrawLoss) files of the Syzygy TBs, for analysing studies, the DTZ files are not really needed.
(The full set is estimated to be around 20TB.)
 
   
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(8) Posted by Arpad Rusz [Sunday, Aug 19, 2018 21:41]

All 7-man Syzygy tablebases have been generated!
ftp://ftp.chessdb.cn/pub/syzygy/
Start downloading them, the total size is "only" 17 TB! ;)
 
   
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(9) Posted by Hauke Reddmann [Monday, Aug 20, 2018 14:08]

Any tech savvy make comments on the *.rtbw format? (It surely isn't plaintext :-)
 
   
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(10) Posted by Geir Sune Tallaksen Østmoe [Monday, Aug 20, 2018 15:30]

Great! I can confirm that the endgame which I tested last week, is now working.
 
   
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(11) Posted by Arpad Rusz [Sunday, Aug 26, 2018 21:15]

I have generated the KPPPvsKPP mutual zugzwangs (173.990 positions):
http://ruszchessstudies.blogspot.com/2018/08/7-man-mutual-zugzwangs.html
 
 
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MatPlus.Net Forum Internet and Computing Does anyone have Lomonossov tablebases at home?