Author: John Merlino
Date: 17:38:20 06/27/03
Go up one level in this thread
On June 27, 2003 at 18:02:44, Guido wrote: >On June 27, 2003 at 16:37:23, John Merlino wrote: > >>On June 27, 2003 at 14:43:33, John Merlino wrote: >> >>>On June 27, 2003 at 08:25:28, Guido wrote: >>> >>>>On June 26, 2003 at 15:33:29, John Merlino wrote: >>>> >>>>>On June 26, 2003 at 14:12:32, Peter Stayne wrote: >>>>> >>>>>>Has anybody figured out how big a complete (w/ pawns) set of 6-mans would be. >>>>>>And noone has completely rendered these yet right? >>>>> >>>>>Marc Bourzhutsky (sp?) is currently creating 6-man files in the de Koning format >>>>>used by Chessmaster. When last I was notified of his progress (which was quite >>>>>some time ago), he had well over 30 DVDs of archived data, but had only >>>>>generated about 10% of the files. I'm pretty sure that the estimate of "over one >>>>>terabyte" is still accurate. >>>>> >>>>>Since the de Koning format tends to be about 20-25% smaller than the Nalimov >>>>>format (or at least it was with the 5-man files), you can feel free to make >>>>>assumptions if you like.... >>>>> >>>>>jm >>>> >>>>Is the 20-25% reduction referred to the normal or to the compressed files? >>>> >>>>Does de Koning format contain info on win, loss and draw, or only on win and >>>>loss+draw without distinction between these last two results? >>>> >>>>Thanks >>>>Guido >>> >>>The de Koning format is always compressed. There is no uncompressed version. >>> >>>The de Koning format contains win/not-win only. >>> >>>jm >> >>I need to clarify that last statement. The ReadMe file for the de Koning >>generator program says: >>-------------- >>The following table sheds some light on the relation between moves, >>plies, and side to move. >> >>data means wtm ... means btm ... >>--------------------------------------------- >> 0 (not used) is mated >> 1 wins in 1 ply loses in 2 ply >> 2 wins in 3 ply loses in 4 ply >> 253 wins in 505 ply loses in 506 ply >> 254 wins in 507+ ply loses in 508+ ply >> 255 draws or loses draws or wins >>-------------- >> >>jm > >Thanks for explanations. >It is very interesting the idea of generating TBs already compressed. >I suppose that the 20-25% of reduction is due to the chosen format that contains >more sequence of zeroes (from an "uncompressed" point of view), if compared with >Nalimov's TBs. >The main advantage of this format seems to me avoiding of 8-16 bits problem that >will arise with 6-men TBs, paying something with the reduction in information >contained in a single file. >I also suppose that the algorithm used by FEG is based on the retrograde move, >considering the relatively very short cpu time spent in generation. > >Ciao >Guido For these kinds of details, it would be best to ask Johan. I'm not fully knowledgeable of the inner workings of FEG. jm
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