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Subject: Re: There goes the surprise ...

Author: Bertil Eklund

Date: 07:13:54 12/01/01

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On December 01, 2001 at 09:52:54, Harald Faber wrote:

>On November 30, 2001 at 18:59:45, Bertil Eklund wrote:
>
>>Hi!
>>
>>I can't tell for sure if it is a problem with this match, but that has been
>>known for a long time that the matches are played with the four Turbo-Cds from
>>Chessbase and some programs handle this wright and some don't. I haven't seen
>>this problem in about 200 games with the Tigers but Paul has seen it in several
>>games. The main reason that the Tigers (eventually) miss the first place is the
>>missing knowledge, that rook and bishop and rook and knight vs rook can't win in
>>most endgames. I have seen the Tigers incorrectly exchange down to these
>>endgames in several (in fact surprisingigly often) cases.
>
>So, do you think that Tiger would exchange IF Tiger had ALL TBs and would see
>that this 5-man is draw?

The problem is that it exchanges down to in example rook and bishop vs rook and
pawn and believe it is winning.
I believe it is necessary to include this knowledge and for example wrong
coloured bishops in the programs otherwise they plays incorrectly when there is
one or more pieces included.

>>Note that the above
>>problem is correctly handled by several engines in example Crafty.
>
>I can implement the code for mating with b+n or I can let it out and say "the
>TBs solve this". Christophe obviously did the 2nd, who is to blame?

I think that most users play with the delivered 3 and 4 man tablebases. There
are also a lot of users that plays with the four Turbo-cds from Chessbase or
Millenium, in fact it is probably a houndred times more people that only use the
standard tbs that is included with the programs.

Bertil

>>It is always
>>possible for the programmers to recommend the settings if they for example don't
>>want us to use the tbs or recommend other settings. Hopefully before the matches
>>and not afterwards.
>>
>>Bertil



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