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Subject: Re: About qsearch...

Author: Uri Blass

Date: 01:26:27 12/30/01

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On December 30, 2001 at 04:18:06, Severi Salminen wrote:

>>The pv is dependent on the depth qsearch and starting from the pv is not
>>something very interesting.
>>The history table is also dependent on the qsearch and if the qsearch is limited
>>there is a bigger chance that the history table is going to be wrong.
>>
>
>Well, I don't do those in qsearch, so that's the reason. If you do, then
>limiting will of course have an effect.
>
>>>>0   2868842
>>>>1   3611982
>>>>2   997968
>>>>3   1564826
>>>>4   1196247
>>>>5   1214999
>>>>6   1184129
>>>>7   1153555
>>>>8   1180282
>>>>9   1153618
>>>>=10  1153584
>>>
>>>I don't quite understand the numbers (they include _all_ the nodes, right?)
>>>above. 0 means actually a 7 ply search with no qsearch at all? 1 means 7 plies
>>>of full width and 1 ply qsearch? How can 2 ply limit have only 997968 nodes?
>>>Shouldn't the number increase when increasing the limit? I'm missing now
>>>something important...
>>
>>It seems to be a question of luck
>>The program sometimes change it's mind more often or less often but my
>>impression is that limiting the qsearch does not reduce the number of nodes in
>>general.
>
>I think something might be broken. The jumps are way too big. Do you get crazy
>PVs?

With limited qsearch to 3 and not to 7
I can get sometimes crazy pv's.

 I don't understand why limiting would increase the size. And on the other
>hand: if limiting doesn't even decrease the size why on earth do you limit?

I limit because I thought about the worst case and I also did not finish my
program and today I do not return something intelligent when I limit the pv.

I may use dynamic excange evaluator that was suggested by christophe.


 But
>I think something odd is happening or you don't count nodes right as the above
>numbers are very strange? Where exactly do you increase node counters?

I increase node counter after making moves(my program generates only legal
moves).

Uri



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