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Subject: Re: Making threat extensions.

Author: Miguel A. Ballicora

Date: 11:26:17 04/19/01

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On April 19, 2001 at 10:59:01, Dan Andersson wrote:

>How many chess programmers do attack extensions other than checking moves. For
>example, when pressing an attack it is often as forcing to threaten the
>opponents queen an thus you gain tempi. Anyone doing that and what are your
>results.
>
>Regards Dan Andersson

I just tried a little bit of that but I had problems. The way I did was
to look at the value that the nullmovesearch returned. If it is <= -mate_in_100
I extended. I other words, every time that a side is threatened with checkmate
I extended. I just made my search huge in one position I tried.
I think that it could be useful in tactical situations but using fractional
extensions (that I did not implement it yet) to limit it.

I think that "Attack" extensions will increase the tree too much unless is
very much controlled doing it with a very low fraction.
I will be very interested too in hearing comments and learn about this.

Regards,
Miguel





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