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Subject: Re: What is the most difficult MATE to find for a computer program ???

Author: Vincent Diepeveen

Date: 14:27:59 12/27/00

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On December 27, 2000 at 13:28:31, Gian-Carlo Pascutto wrote:

>On December 27, 2000 at 12:32:45, Vincent Diepeveen wrote:
>
>>First of all SJENG is a mate prover so let's forget sjeng.
>
>Either you are confusing me with CHEST, or you have bad memory.

Sjeng: prove

You typed in PROVE and it then shows: "position is won, without
showing any 'mate in xx' or whatever.

So if i confused you with a mate prover, i'm sorry for that!

>>Diep isn't a mate prover but a normal chessprogram.

>So is Sjeng. It has, however, a special matefinding search.
>It is always enabled for suicide chess, but I also use it for
>normal chess or crazyhouse sometimes.
>>It took indeed some 6 years of search experiments to get that far.

>It took me 2 evenings to implement it. Most of the theoretical
>work had been done by Dutch (ironic isn't it?) researchers but
>no-one had bothered to implement it for normal chess yet.

>>Note that this position was at the homepage from WEINERS company
>>to promote if i'm right shredder2.
>>
>>Nowadays to my amazement shredder4 no longer finds it!
>>
>>dunno about shredder5.
>>
>>So if i were as ignorant as the majority of
>>posters here: shredder got worse!
>
>They no longer overextend forced checking sequences. You still do.

This is the biggest nonsense i ever heart.
You tell me, having made a program which uses less nodes a ply as
any other program that's not forward pruning other as nullmove,
that i'm 'overextending'?

Perhaps you should rephrase that!

>Oh and by-the-way...Sjeng without the matefinder finds the correct
>move in +-170 nodes.

This is complete bullshit unless you have a lot of luck with
move ordering which is one in a million or something here,
or you count nodes in a very weird way.

>--
>GCP



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