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Subject: Re: Hydra-Scylla 1.05

Author: Drexel,Michael

Date: 13:28:18 04/16/05

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On April 16, 2005 at 14:12:01, Roger D Davis wrote:

>First you said...
>
>"No way, this can be fixed easily without any decrease in strength."
>
>Then when I ask "What would be an easy way to fix it without decreasing
>strength?" you said...
>
>"You certainly can not solve the problem generally without decreasing strength
>but it is at least possible to prevent the engines from playing this beyond
>stupid move." You then said that preventing such moves might indirectly increase
>strength.
>
>These statements appear to be mutually exclusive, or maybe you just changed your
>mind?

In my first statement I only referred to the stonewall setup.
It shouldn´t hurt playing strength if you force the engines to go for
b4-b5/b5-b4 in such positions and avoid a4-a5/a5-a4.

The Haglund game was not a stonewall. It was a different pawn structure.
I don`t think it is that easy to fix in general.


 If you did change your mind, I can certainly appreciate why...if it was
>easy to fix without any decrease in strength, the Shredder or Hydra team would
>probably have already done it.

I do not think they are very concerned about this.

>
>Seems like the easiest way to deal with this would be by tailoring the book to
>play ONLY open positions against human players. In other words, have the
>computer use ANTI-HUMAN play before the human can use anti-computer strategies.
>The operator should be able to choose what book the machine plays before the
>game begins, just a human chooses his opening based on his opponent.

Yes, but it is not that easy to avoid this positions.
The human player who uses such a strategy will certainly try to lure the engine
into closed positions by playing provocative moves.

Michael

>
>However, if you're looking for a set of "chess general heuristics" that provide
>the best move in any circumstance, then I guess you wouldn't want to exclude the
>possibility of such positions. I guess your design depends on your
>goals...desire to win the most games or desire to advance the art.
>
>Roger



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