Author: Andrew Dados
Date: 11:08:23 07/19/00
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On July 19, 2000 at 14:00:16, Landon Rabern wrote: >On July 19, 2000 at 13:22:47, Andrew Dados wrote: > >>On July 19, 2000 at 12:03:10, Landon Rabern wrote: >> >>>I have been discarding all captures where attackervalue>DefenderValue in my >>>q-search which speeds it up significantly, but I know that it is throwing away >>>some captures that are good. So I implemented a SEE function. The SEE returns >>>the correct value on tests I have run. When I put this into my program so that >>>if (attackervalue>DefenderValue)&&(SEE>=0) I keep the move as well, I got worse >>>results on the WAC test suite. Before I put the see in I got 270/300 at 60 >>>seconds per move and after I got 257/300 at 60 seconds per move. >>> >>>Is it just that there are no capture sequences in this test that need the extra >>>captures, or is there something wrong with my SEE function? >>> >>>Thanks for any help, >>> >>> >>>Landon W. Rabern >> >>It would be of help if you post some relevant positions. I may just guess now >>that if you do check detection in qsearch you may find some mating combinations >>with 'losing captures', when recapturing piece is overloaded simply, so in next >>move capture is mate. (Or you may do some non-capturing,checking moves in >>qsearch which complicates matters still). With SEE you miss those. Question is >>if average speedup of SEE in non-tactical positions offsets those few missed by >>using SEE.... >> >>-Andrew- > >I do not do checks in q-search. The problem is that I should be missing fewer >tactical positions with SEE, than with just throwing all captures out where >attackerValue>defenderValue. > >Landon So maybe you are much faster then SEE with throwing away all captures where attackerValue>defenderValue... Single out those positions and compare PVs and nodes produced with both versions of your qsearch ply by ply. Then maybe you/we can learn what's going on. Do you reach extra ply or does your program find those moves one/few plys sooner? -Andrew-
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