Author: Frank Phillips
Date: 04:04:02 05/08/04
Go up one level in this thread
On May 08, 2004 at 06:13:39, Jeff GAZET wrote:
>Hi,
>
>when getting hashtable informations like this :
>
>switch(target->flags)
> {
> case hashfEXACT: return target->eval; break;
> case hashfALPHA: if(i<=alpha) {return alpha;} break;
> case hashfBETA: if(i>=beta) {return beta;} break;
> }
>
>In which case mustn'nt we do a null-move ?
>
>Thanks.
If your hash record for a node (position) does not have enough draft to return
from the search at this point, but does have enough draft (ie current_depth – R)
for the null move search and predicts that it will not fail high (ie the value <
beta) then you can avoid the null move search for this node.
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