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Subject: Re: Nalimov end game tablebase

Author: Heiner Marxen

Date: 07:14:33 02/16/02

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On February 16, 2002 at 08:25:26, ramkumar wrote:

>I have downloaded all the 5 men today form hyatt's ftp thanks very much to
>hyatt for reloading soon.I have 3-4 already .The concern is about 6 men
>tablebase,i would like to download it all but lack of HD.what would anyone
>suggest about the 6 men tablebases form nalimov?I know it is better to have 6men
>coz more tablebase the more the engine plays the eng game perfectly.

If you do endgame studies it will make a significant difference.
Otherwise, the overall playing strength does not increase dramatically
with EGTB support.  The difference between having/not having the 6-men tables
that are available is an even smaller difference.

Others have estimated the difference in playing strength for EGTB on/off,
so you may find more info via the archive search.  IIRC it was estimated
around 20-30 ELO points.  Clearly a smaller effect than doubling the CPU speed.

>BUT anyone
>might afraid after looking it's size and I don't have space for that (sorry I
>don't know the total size may be it will reach more then 100gigs or what ?for
>all the 6 men tablebase??????may be my guess .so I would hope for reproducing
>the tablebase in smaller size in the comming future from nalimov or anyone .
>it would be very very nice news for chess lovers when 3-4-5-6 men tablebase
>comes to a compact size .when will it be ?I am waiting .....all are waiting.
>ram.

Frankly, don't hold your breath.  The Nalimov EGTBs are already compressed
with a specially designed compression algorithm.  Currently nobody seems
to know a much better method to compress them, so I don't expect much
innovation here.  And even _if_  a new method would cut the size to 50%...
that would not help your disk space problem that much.

I'd suggest to be happy with what is there (having all 5-men is nice, isn't it?)

HAND!
Heiner



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