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Subject: Re: Crafty Tablebase Probes

Author: Vincent Lejeune

Date: 11:39:29 08/27/99

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A little article about 6 men TB here :
http://www.xs4all.nl/~timkr/chess/perfect.htm


On August 27, 1999 at 11:09:59, Robert Hyatt wrote:

>On August 27, 1999 at 01:54:24, blass uri wrote:
>
>>
>>On August 27, 1999 at 00:06:25, Robert Hyatt wrote:
>>
>>>On August 26, 1999 at 20:21:04, Mark Rawlings wrote:
>>>
>>>>I _finally_ got all of the 5-piece tablebases to use with Crafty and Winboard!
>>>>These things are great for analyzing endgames.  Still waiting for the 6-piece
>>>>files to be posted :)
>>>>
>>>>Anyway, what is a "successful" tablebase probe?  I thought when you have the
>>>>whole set, all probes were successful?  Thanks,
>>>>
>>>>Mark
>>>
>>>
>>>Note that you don't have the "whole set" because we didn't build the 4 vs 1
>>>piece files.  You can, but they take up a whole lot more space, and I don't
>>>think crafty needs those to win the positions.. :)
>>
>>There are some 3 vs 2 tablebases that crafty does not need to win the position.
>>
>>For example KQRvs KP,KQR vs KN
>>
>>Uri
>
>
>There are many that it doesn't need... (KQ vs KR is another) however without all
>of them, the search definitely gets confused.  And it is much better to _know_
>when you are exchanging into a won ending, rather than into an ending you think
>you can win but can't...
>
>We will have to do the 4 vs 1 files before we get to the 3 vs 3 files, which
>are not too far into the future now.  So one day we will have all the 5's and
>a bunch of the 6's...



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