Author: Eugene Nalimov
Date: 21:51:51 02/10/02
Go up one level in this thread
On February 10, 2002 at 18:55:59, Angrim wrote:
>On February 09, 2002 at 22:35:54, Robert Hyatt wrote:
>
>>On February 09, 2002 at 11:26:00, Joshua Lee wrote:
>>
>>>How do you determine the space necessary for each additional piece? If we know
>>>all 6 man will take over 1 TerraByte what about figuring out the 7's, 8's ....to
>>>32 and up? I personally think the only way to fit it all in less space is to
>>>make a new kind of Tablebase but since the compression is already good this
>>>would be hard to do.
>>
>>
>>Several issues:
>>
>>1. 6 piece files are going to require some large mate-in-N scores. IE they
>>will need 16 bits at least, which doubles the size compared to a current 5
>>piece file where all scores are 8 bits max.
>
>This doubles the size of the file before compression, but has little
>effect on the size of the compressed file. At least as long as the
>majority of the positions in the file are relatively short mates or
>draws. Only the positions which are long mates will take extra
>space after compression. Compression could be further improved by
>switching to building DTC tables.
>
>>2. another piece multiplies the size by roughly 60.
>
>yep.
>>3. Unknown compression ability. We already have some 6 piece files that
>>are 3+ gigabytes. These are pawnless which have max symmetry. Pawns will
>>increase that significantly.
>
>I assume that is 3gig before compression. I would expect that
>6pc tables with one pawn(ie. KRPvKRN as a possible worst case) to
>take around 3GB compressed.
K:\42>dir \\eugenen8\tbgen-e\krbkbn.*
Volume in drive \\eugenen8\tbgen-e is CROCODILE0
Volume Serial Number is 4234-7758
Directory of \\eugenen8\tbgen-e
07/03/2001 12:16a 790,695,385 krbkbn.0.nbb.emd
07/03/2001 05:26p 953,091,511 krbkbn.0.nbw.emd
11/25/2001 10:58p 682,272,645 krbkbn.1.nbb.emd
11/25/2001 11:55p 970,726,088 krbkbn.1.nbw.emd
11/26/2001 12:22a 354,055,987 krbkbn.2.nbb.emd
11/26/2001 01:00a 646,507,150 krbkbn.2.nbw.emd
04/23/2001 02:17a 10,182 krbkbn.tbs
7 File(s) 4,397,358,948 bytes
0 Dir(s) 283,869,184 bytes free
:-)
Eugene
>Angrim
>ps. in theory, the KKK vs KKK suicide chess EGTB is small enough to
>build on my home machine..
>In practice, I'm not *that* bored.
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