Author: Martin Giepmans
Date: 02:53:16 12/30/02
Go up one level in this thread
On December 30, 2002 at 05:30:45, Ed Schröder wrote:
>As it seems I have completely mishandled explaining Reduction 2b and 2c, I have
>corrected things.
>
>http://members.home.nl/matador/chess840.htm
>
>Click on the blue "update" picture, it will move you directly to the changes
>made. That will be standard procedure from now on in case of errors.
>
>if (remaining_depth<=x && remaining_depth>1) then
> { if (ALPHA < SCORE + THREAT) -> do not reduce
> if (ALPHA < SCORE + THREAT + MARGIN) -> reduce depth with one ply. }
>
> SCORE : score of EVAL
> THREAT : Queen=900, Rook=500, Bishop=300, Knight=300, Pawn=100
> MARGIN : TABLE [remaining_depth];
>
> static int TABLE[]= { 00,00,10,15,20,25,25,25,25,25,25,25,25,25,
> 25,25,25,25,25,25,25 ........... };
>
>The idea is, if SCORE+THREAD are not going to make it to ALPHA, but with an
>extra small MARGIN it will then reduce the depth. I can't remember the speed-up
>this reduction gave.
>
>====
>
>Ed
>
>PS, the "faulty stuff" plus Uri's correction is maybe worth a try, who knows :)
The < in the second formula should be > ?
Otherwise the two formula's together don't make sense.
(if the first is true, the second is also true)
Martin
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