Author: Richard Pijl
Date: 07:45:41 09/03/04
Go up one level in this thread
On September 03, 2004 at 10:43:45, Richard Pijl wrote:
I just read you're using fail-hard. Sorry, the snippet below won't work for you
then.
Richard.
>On September 03, 2004 at 10:14:53, Stuart Cracraft wrote:
>
>>On September 03, 2004 at 09:47:26, Jan K. wrote:
>>
>>>You should look for bugs in your search....i find the move even with no
>>>extensions but the threat extension set to 1/2 ply and no checks in qsearch.
>>>Takes 60 seconds and almost the same number of nodes like your full search.
>>
>>Tord said something about having the null move search a window
>>wider than -beta+1,beta and and then testing the return value
>>against alpha-MARGIN. If less than that, a faillow and then
>>extending.
>>
>>Has anyone else with PVS search implemented mate. Can you just
>>include your code fragment in reply to this. I have programmer's
>>block.
>>
>>Thanks. Stuart
>
>The code below seems to work ok. The Baron (without giving checks in qsearch,
>and recapture extensions) finds WAC141 in less than 10 seconds on a Xeon 2.8.
>
> makenull();
>
> /* do reduced search */
> if (depth-R < ONEPLY) {
> x=-quiesce(-tbeta, -tbeta+1);
> } else {
> x=-search(-tbeta, -tbeta+1, depth-R, total_ext);
> }
> takeback();
>
> if ((x >= tbeta) && (x<30000)) {
> /* Good score, but do not cutoff with a matescore to prevent zugzwang
>issues */
> return x;
> }
>
> if (x<=-30000) {
> /* Opponent has matethreat */
> ext+=THREAT_EXTENSION;
> }
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