Author: Alvaro Jose Povoa Cardoso
Date: 06:31:02 08/09/01
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
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