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Subject: Re: Null move reductions

Author: Will Singleton

Date: 17:24:08 10/04/98

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On October 04, 1998 at 19:06:15, Roberto Waldteufel wrote:

>Hi all,
>I wonder what reductions various programs use for the null move. I reduce by two
>plies, but I believe a one-ply reduction may be more usual. However, I have
>found R=2 produces quite good results in my program. I would like to hear of
>others' experiences.
>Best wishes,

Amateur uses r=2, and gets about a ply deeper on average.  But I've noticed that
in positions where there is a clear better move, the node reduction is great,
and in positions where there is no clear cut better move, the reduction is not
that great.  Of course, you need it most in the latter situation.  I'm probably
doing something wrong.  Do you notice anything similar?


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