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Subject: Re: Opposite side castling

Author: Will Singleton

Date: 01:22:32 02/20/98

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On February 19, 1998 at 21:44:09, Howard Exner wrote:

>A game from KKup2 has reached a point where CM5500 (black) can go
>a pawn up against Fritz by playing Rxh5 but I think that could be the
>wrong
>plan in this opposite side castling game. This could ultimately result
>in a white initiative as such pawns are commonly sacrificed anyway.
>Another interesting opposite side castling game is the Crafty vs
>Rebel.
>   A question for programmers: do you incorporate chess
>knowledge to deal with opposite side castling situations ie. giving
>bonuses for advancing the pawns and opening lines to the opposing
>king? Is this still a good anti - computer technique for humans
>to employ, namely castling on opposite wings?


Howard,

In my nascent program, Amateur, I have specifically targeted the
opposite-side castled king for pawn advance attacks.  In fact, the
program seems to sense this, and might delay castling until the other
side commits, so it can castle opposite to subsequently attack.

I'm not sure this is such a great idea, but it has its successes.  One
problem is that, to encourage it to advance the pawns, I give it a
greater score for each advanced rank on that side.  But, sometimes, it
likes those extra scores so much that it will fight to protect it's
advanced pawns, rather than give them up to open files, etc.  It may be
a case where you want to pass a ply 1 improvement score to the eval
rather than just eval the end position, that's next on the list to try.

I've noticed that people try to castle opposite on Amateur all the time,
and gain a king-side attack.  They usually sac the bishop on the h pawn,
but Amateur has shown, even in this early stage, that it defends rather
well, and will end up winning against such attacks.

Will



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