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Subject: Re: KB*KP* -> some first promising results

Author: Thomas Mayer

Date: 10:55:45 02/02/05

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Hi Dieter,

On February 02, 2005 at 12:40:54, Dieter Buerssner wrote:

>On February 01, 2005 at 16:44:48, Thomas Mayer wrote:
>
>>Maybe Yace can, Dieter is a clever
>>guy, I have not tested... :)
>
>Thanks, but Yace can't do it. I only use recognizers up to 5 men.

Quark up to 6 men without pawns... but not all is finished yet, some quite
important once are still missing... but it grows -> at the moment I am debugging
the stuff, there were several +/- etc. mistakes, also it seems I had some
problems the nights I was programming that with the mirroring... this caused
also some misevaluations. Anyway, it looks quite stable now. (Some issues left)

> I have coded a few others (KBP[and more Ps] vs K with all rook pawns, and
> KPPPP... vs K all rook pawns), but don't use it at the moment.

They are part of my KP*K and KB*P* recognizers... this is quite simple and
almost cost zero. If all pawns are on a rook file and the most advanced pawn is
a draw in the bitbase then the hole position is draw... of course you could also
program that without bitbases with some rules, but I have my doubts that this
could be faster...

> I cannot think of lots of configurations with
> more than 5 pieces, where one could code a recognizer.

Well, I doubt that I will program 6men recognizers -> those ideas will be put
mainly in special evals -> why not use the bitbases in the eval if they are
there ?!

> I thought about totally
> blocked positions like
>
> [D] K7/8/P2P2P1/P2P2P1/p2p2p1/8/8/k7 w
>
> but I have no efficient code for it.

I think about that too in the moment, but before I get a headache I stop... :)
So far I am quite happy about the speedup I get and about some earlier found
solutions... I hope Quark will be near soon to Yace endgame strength... :) (As
usual, you must have a target when you work on something... is it reachable ?!:)

Greets, Thomas



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