Author: Jeff GAZET
Date: 12:47:47 05/08/04
Go up one level in this thread
>>>>>Hi,
>>>>>when getting hashtable informations like this :
>>>>>switch(target->flags)
>>>>> {
>>>>> case hashfEXACT: return target->eval; break;
>>>>> case hashfALPHA: if(target->eval<=alpha) {return alpha;} break;
>>>>> case hashfBETA: if(target->eval>=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 stored hashflag is not a lower bound and the stored
>>>>> value is < beta) then you can avoid the null move search for this node.
>>I don't understand what means "draft". I would understand better a piece of code
>>than a sentence, if possible.
>>So you say :
>>if(depth-R>0 && target->eval<beta)... DoNull=FALSE... ? :-)
>>Thanks
> if (type == UPPER && depth-R <= draft && tableval < beta)
> avoid_null = 1;
>Draft is "remaining depth" and is the depth value stored in the hash table...
Thank you all.
A last "stupid" question : is UPPER = hashfALPHA ?
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