Author: Joshua Shriver
Date: 12:17:03 11/22/05
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Nice, by chance know where they can be downloaded? Are there different BB formats? Are there any open-source generators? -Josh > >You just try all child positions and choose the one with the smallest DTM. > >The advantages of bitbases is that they are MUCH smaller. First, many 6-men >tables have DTMs > 127, which means they need two full bytes per position. >Bitbases need only 0.25 bytes. Secondly, bitbases compress MUCH better. This >is easy to see, as a tablebase will look like this: > >+11 +9 +25 +4 0 +9 +7 -> mostly wins, but all with different distances > >as compared to a bitbase > >11 11 11 11 01 11 11 -> and all the wins can be compressed very neatly using >run-length/Huffman etc. Furthermore all the wins will tend to lie together if >you order your indexing right. > >The complete set of 6-man Nalimov TBs are >= 2TB I think, whereas I think >Vincent said his Diep bitbases were 100GB or something like that. > >anthony
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