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Subject: Re: how to detect information about pawn structure based on bitboard

Author: Gerd Isenberg

Date: 16:53:51 12/17/02

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On December 17, 2002 at 19:25:11, Uri Blass wrote:
<snip>
>I admit that it is hard to define it for specific pawns and I guess that it may
>be better to evaluate it only for a set of pawns.
>
>I meant cadidares to be passer pawns
>Here are some examples:
>
>[D]k5K1/8/8/2p5/1p1p4/1P6/2P4P/8 b - - 0 1
>
>black can generate a passed pawn but needs to sacrifice 2 pawns for that target.

I see, interesting. Have to think about. Of course you should also consider this
one already with compensation of the saced pawn:

[D]k5K1/8/8/8/1pPp4/8/2P4P/8 b - - 0 1

>
>c4 bxc4 d3 or c4 dxc4 b3
>
>[D]k5K1/8/8/2pp4/1p6/1P6/2P4P/8 b - - 0 1
>
>black does not need to sacrific to generate  a passed pawn(again I see no way to
>define exactly which pawn is the candidate to be passed pawn for evaluation).
>

One has to detect pawn groups (forgotten the special term) like 2:1 or 3:2.
Currently i only consider 2:1 majorities. But it would be nice to evaluate other
majorities as well as pawn breaks at least in pawn-endings.

Gerd

>Uri



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