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Up Topic The Rybka Lounge / Computer Chess / Tablebase sizes
- - By Objective Bias (*) [us] Date 2009-01-15 09:17
What are the sizes (measured and estimated) of 6, 7, and 8 man tablebases. (And beyond if possible)?

Please read my question carefully. I'm not asking for the size of 3, 4, or 5 man tablebases. I'm not asking for a link to a chart that will show me the size of 3, 4, or 5 man tablebases.

I'm not looking for a link to a site where I can order 5 or 6 man tablebases unless it also has a chart with this information.

It's a really simple request/question and I'd rather have no answers at all than answers that have nothing to do with my exact question.
Parent - - By Permanent Brain (*****) Date 2009-01-15 11:38
[deleted]
Parent - - By Objective Bias (*) [us] Date 2009-01-15 12:17
This is why I was so adamant that answerers read my question carefully.

I asked for estimates if a measurement wasn't available.

I'm sure there are people who have estimated the sizes of these tablebases. And I would like a link to said estimates or someone to simply tell me them.
Parent - - By Aliven (***) [us] Date 2009-01-15 12:57
For someone so adamant that his question be answered precisely, you haven't done any research of your own. After only a short time searching, I can tell you that 6 piece tablebases require around 1.2 TB (Terabytes) of space assuming Nalimov format. A complete 7 man set is simply not feasible for a normal user. I read that it would take up approx. 60 TB of space (I can't confirm the accuracy of this statement- but it seems reasonable). So you could imagine an 8 man tablebase would require ridiculously large amounts of data storage. I would say 8 man is well out of range with our current technology (who's going to donate a supercomputer to calculate them for us. they are far too busy calculating the rate of decay of our nuclear arsenal =/). As far as I know, there is no estimation for the size of an 8 man base. But you can easily infer that it would take up over a Petabyte of data for a complete set.
Parent - - By Uly (Gold) [mx] Date 2009-01-15 13:03

> 60 TB of space (I can't confirm the accuracy of this statement- but it seems reasonable).


No, that would be implying that 7men tablebases have 60x times the size of 6men, which is impossible.
Parent - - By Ernst (***) [nl] Date 2009-01-15 14:16
As 6 men take about 170 times the size of 5 men tablebases, I guess that 7 men would take at least 200TB, assuming that the factor is linear.
Parent - By Aliven (***) [us] Date 2009-01-15 18:32
crazy. They are coming out with SDxc cards that can hold 2TB. That would be great to hold a 6man.
Parent - - By Objective Bias (*) [us] Date 2009-01-16 00:49
My question was for measurements and/or estimates of the size. Not about the feasibility. I know the actual required storage is a roadblock as of yet.

I'm really only curious for curiosity's sake. It's not like I'm trying to get my hands on 7-man tablebases.

At least not yet :p
Parent - By Aliven (***) [us] Date 2009-01-16 03:53
Yeah, it's truly a shame they can't make them smaller somehow. I read about some format dubbed "bitbases" that are supposedly smaller. You can access a free 6 man base at www.shredderchess.com if your curious about any endgames- It's a lot of fun.
Parent - By Permanent Brain (*****) Date 2009-01-15 21:49
<plonk!!!>
Up Topic The Rybka Lounge / Computer Chess / Tablebase sizes

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