Author: Harald Lüßen
Date: 06:04:15 04/08/04
Go up one level in this thread
On April 08, 2004 at 07:10:29, Daniel Shawul wrote:
>Hi
>Here are some questions
>
>2.In Ed's paper there are some tricks done at horizon.
> trick one if(score - (margin + largest hanging piece) > beta)
> don't do quiescence
> trick two if(score - 900 > beta)
> don't do quiescence
> My question is every body does
> score=eval()
> if(score > beta)
> don't do quiescence;
> So i don't see how the tricks work?
His alpha is our beta and vice versa.
I do:
int search( depth, alpha, beta )
{
score = evaluate();
// pruning tricks here
while ( moves )
{
do_move();
score = -search( depth-1, -beta, -alpha );
undo_move();
}
}
Ed perhaps does:
int search( depth, alpha, beta )
{
while ( moves )
{
do_move();
score = evaluate();
// pruning tricks here
score = -search( depth-1, -beta, -alpha );
undo_move();
}
}
Translated to my function his tricks would look like:
trick one if(score + margin + opponents_largest_hanging_piece < alpha)
don't do quiescence
trick two if(score + 900 < alpha)
don't do quiescence
And that I can understand.
Harald
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