Author: Antonio Dieguez
Date: 09:07:16 10/26/02
Go up one level in this thread
>>score = -alphabeta(board, -alpha-1, -alpha, depth-1);
>>
>>if(score > alpha && score < beta)
> ^^^^^^^^^^^^^^^
>
> Don't use beta there. You just want to know you're above the pv score (which
>is alpha now).
if I am not mistaken it depends on the exact writing.
he can write
make...
score = -alphabeta(board, -alpha-1, -alpha, depth-1);
if(score > alpha && score < beta)
{
unmake & make(depends on the program)
score = -alphabeta(board, -beta, -alpha+1, depth-1);
}
unmake
if (score>alpha)
{
blabla
if (score>=beta)
{ update killer; update hash; etc. }
}
-------------------
or he can write something like this?
make
score = -alphabeta(board, -alpha-1, -alpha, depth-1);
if(score > alpha)
{
if (score>=beta)
{ unmake; update killer; update hash; return beta; }
unmake & make(depends on the program)
score = -alphabeta(board, -beta, -alpha+1, depth-1);
unmake
if (score>alpha) // 'cause it could fail low right?
{
if (score>=beta)
{ update killer; update hash; return beta; }
etc.
}
}
I have written the first option, I think I can't make it prettier with the
second option or something else but may be you can write it better off corse.
Ah if the search always return alpha or beta then that can change things.
antonio's usefull post.
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