Author: Robert Hyatt
Date: 11:21:57 04/26/00
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On April 26, 2000 at 13:09:09, John Merlino wrote: >On April 25, 2000 at 23:55:32, Robert Hyatt wrote: > >>On April 25, 2000 at 16:04:25, Pete Galati wrote: >> >>>On April 25, 2000 at 14:01:24, John Merlino wrote: >>> >>>>Is it true that you can still ship your engine with Ken Thompson's endgame >>>>databases (and code to access them, of course) with only a credit to the author? >>>> >>>>My version of these CDs that I have is four years old, but that's what it >>>>implies in the readme file.... >>>> >>>>jm >>> >>>It is my understanding that Ken Thompson no longer uses CCC. You may however be >>>able to contact him if you can find an email address for him, I don't have it. >>> >>>Pete >> >> >>I can give it to you if you contact me via private email. I hate to post >>email addresses in public places, as the riff-raff pick up on it and cause >>problems. > >I already found his e-mail address, asked him what the status was, and he >replied very quickly! Apparently, his databases are still not copyrighted, and >only require giving him credit somewhere in the program. > >jm > >p.s. Crafty uses a different tablebase format, correct? If so, why? \ yes, they are different. For several reasons: (1) the Nalimov tables are distance to mate, not distance to conversion, which (IMHO) makes them easier to use. (2) the N tables can be decompressed on the fly with absolutely no loss of speed (on anything but the fastest of drives, it is actually faster to use the on-the fly compression than to have uncompressed files. (3) the N tables handle en passant. I don't know if Ken ever fixed that or not.
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