Author: Frank Phillips
Date: 04:11:04 05/08/04
Go up one level in this thread
On May 08, 2004 at 07:04:02, Frank Phillips wrote:
>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.
should have said: ..... predicts that it will not fail high (ie the stored
hashflag is not a lower bound and the stored value is < beta)......
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