Re: PL69 slower ?

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Article #5183

#5183

From: Dan Oetting
Date: Sun, 10 Apr 1994 17:54

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Kong Sian suggested:

>Change
>      if (history[j] < HISTORYLIM)
>        history[j] += (unsigned short) 1 << depth;
> 
>to
>      if (history[j] < ((unsigned short) 1 << depth))
>        history[j] = ((unsigned short) 1 << depth);

I think a more correct implimentation might be

      if (history[j] < HISTORYLIM)
        history[j] |= (unsigned short) 1 << depth;

thus only setting one bit per depth.  As a further refinement, instead
of clearing the history every move, shift it down by one bit and preserve
the information gained from the previous move.

	-- Dan O. <oetting@gldfs.cr.usgs.gov>

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From: oetting@gldfs.cr.usgs.gov (Dan Oetting)
Newsgroups: gnu.chess
Subject: Re: PL69 slower ?
Date: 10 Apr 1994 13:54:22 -0400
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