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Subject: Re: Why is this position so difficult to evaluate?

Author: Dann Corbit

Date: 01:34:27 01/11/00

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On January 11, 2000 at 04:02:27, Peter McKenzie wrote:

>On January 10, 2000 at 22:41:51, Dann Corbit wrote:
>
>>
>>Sierwan talks about exactly this kind of position in one of his books.  The
>>tactics one, IIRC.
>
>Please post one or two of his positions if you have the book handy
I loaned all of my chess books to one of my friends (another would-be chess
program author).  However, I do recall that Sierwan talks about it at length,
and even demonstrates positions where you can remove the bishop from the board
with no effect.  It is obviously something he strives for in a game.

It might have been the strategy book.  Anyway, here is a fairly obvious example
of the principle:
r1k2br1/p7/Pp1p3p/1PpPp1pP/2P1PpP1/1K3P2/8/8 b - -

Black is "up" 13 but if the bishop were a different color, the whole game
changes instantly.  As it is, it is an obvious draw.

This is the garden variety "bad bishop" but any variation on this theme will
render the bishop useless (as in the game at hand).





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