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Subject: Re: Behind Deep Blue: 3rd print with new Hsu afterword

Author: Tord Romstad

Date: 14:49:03 05/08/04

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On May 08, 2004 at 12:14:42, Anthony Cozzie wrote:

>I will accept that my 4 ply search plays pass moves some of the time :)  Zappa
>uses pure R=3 now, and perhaps the evaluation isn't quite good enough for it.

If you are not sure your evaluation is good enough, you could try to make it
aware
of its limitations.  I also use R=3 most of the time, but make an exception at
positions where the evaluation raises a "warning flag".  At positions where the
side to move has a bad king safety or a trapped piece, or the other side has
dangerous passed pawns, I reduce R to 2 or 1.  For me this works better than
all other schemes I have tried, including pure R=2, pure R=3, verified null
move,
and adaptive null move depending on remaining depth.

Tord
]



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