Author: Bruce Moreland
Date: 09:48:25 08/09/01
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On August 09, 2001 at 09:31:02, Alvaro Jose Povoa Cardoso wrote:
>Since you are undertaking the Gerbil educational project, I would like to ask
>you if you could implement Enhanced Transposition Cuttofs (ETC) in Gerbil with a
>switch so that it can be turned on/off.
>I know ETC doesn't give much in chess but I would like to experiment in
>checkers.
>My inplementation is working but it is not elegant at all.
>Since we are dealing with the other player I avoided some complications
>by creating a special version of Hashprobe() wich returns a score and by use of
>an additonal flag informs me if there was a cutoff at the next ply.
>So, and using 'crafty language' I do the following:
>
>for every move at this ply:
>
>Makemove
>
>Score =
>-ETC_HashProbe(tree,ply+1,depth-INCPLY,ChangeSide(wtm),-beta,-alpha,&cutoff)
>
>Unmakemove
>
>if (cutoff) {
> if (Score >= beta) {
> return (Score);
> }
>}
>
>
>Best regards,
>Alvaro Cardoso
Gerbil is on hold until after the WMCCC.
Is the point of this to try to find cases where the weaker side can achieve a
repetition?
bruce
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