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Subject: Re: Can we do counter-move reductions?

Author: Álvaro Begué

Date: 12:19:09 08/30/05

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On August 30, 2005 at 13:42:36, rasjid chan wrote:

>It is strange I read this the first time, must be not popular.
>
>Can we do an enhanced history heuristic by counting how often
>B(from2,to2) refutes A(from1,to1) when move B causes a beta-cutoff?

This is an old idea of mine. I used it in a connect-four program many years ago,
and it worked really well. I found that what works best is using a linear
combination of the traditional HH score and what I call the HH2 score. Something
like this:

score = 64*HH2[prev_move.from][prev_move.to][this_move.from][this_move.to] +
HH[this_move.from][this_move.to];




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