Author: Gian-Carlo Pascutto
Date: 10:45:32 03/19/02
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On March 19, 2002 at 13:40:54, bob o wrote: >3. When playing around with tbcomp.exe I noticed that if you decompress the >downloaded files and then compress them again with large values for the size of >the encode block size (the -e parameter) you can change (and reduce) the size of >the files; for the 6-man files I tried so far I got very significant size >savings, but I was not able to run them under crafty (I think it said something >like illegal block size or something, it's been a while... I can try again to >reproduce this if requested). Is it possible to compress them in this manner to >get savings in file size? And if it is possible, what are the chess-playing >ramifications of this? When the compression software was being developed, Robert did tests with several different blocksizes to determine which was the most efficient one. It turned out to be 8192 bytes. If you use a different size, your tablebases will be unusable by most programs. The problem of using larger blocksizes is that the whole block has to be read in and decompressed in order to find a single position. For large sizes, this will slow down the search too much. -- GCP
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