Author: Dann Corbit
Date: 15:29:34 01/23/01
Go up one level in this thread
On January 23, 2001 at 14:45:15, Peter Kasinski wrote: >On January 22, 2001 at 15:54:32, Robert Hyatt wrote: > >>On January 22, 2001 at 12:52:04, Peter Kasinski wrote: >> >>> >>>I am trying to understand the impact of _not_ having some of the tablebases on >>>programs like Crafty or Deep Fritz. Loading K+Q+Q+R vs K on my hard disk seems >>>almost frivolous. Would it weaken the program if some of these _clearly always >>>won_ cases were not present? >>> >>>thanks, >>>PK >> >>It is better to have _all_. Crafty calls Eugene's probe code when the number >>of pieces on the board drops to some value (5 if you have any 5 piece files >>available). If you don't have that file, I call his code, he returns "failure" >>and we keep searching. If you have them all, then _every_ call will be >>successful and it is more efficient... > >I understand. But in that case, how about the current 6-man files. Does it make >sense to use these at all? As soon as Crafty reaches that stage it will start >probing the 6-man tablebases - which at this stage will be a futile attempt in >_most_ cases... Am I right? > Depends on what is on the board. Suppose that you are left with: 7r/7r/7k/8/1R6/1K6/2B5/8 w - - And you happen to have the krbkrr tablebase files. Then your probes will be 100% accurate (providing that you also have the 5/4/3 piece files). The 6 piece files are a mega win if you get a hit. So you pays your money and you takes your chances. If I were going to play in a tournament, I would want every available 6 piece file. An 80 gigabyte disk is a couple hundred dollars. For a thousand dollars, you can hold an awful lot of tablebase data.
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