Author: Christophe Theron
Date: 21:53:56 01/25/00
Go up one level in this thread
On January 25, 2000 at 23:27:40, Peter McKenzie wrote:
>On January 25, 2000 at 20:52:28, Christophe Theron wrote:
>
>>On January 25, 2000 at 17:29:15, blass uri wrote:
>>
>>>On January 25, 2000 at 13:31:01, Christophe Theron wrote:
>>>
>>>>On January 24, 2000 at 15:50:15, blass uri wrote:
>>>>
>>>>>On January 24, 2000 at 15:34:39, Christophe Theron wrote:
>>>>>
>>>>>>On January 24, 2000 at 09:10:12, Robert Hyatt wrote:
>>>>>
>>>>>>>I suspect that one commercial program is doing no capture search, but may be
>>>>>>>using a static exchange evaluator to prevent the last move in a PV from
>>>>>>>being an outright blunder. Seems to be working. No names to protect the
>>>>>>>guilty, however. :)
>>>>>>
>>>>>>
>>>>>>
>>>>>>I'm really curious about this. Using a SEE to "close" the search is in my
>>>>>>opinion a beginner's mistake (no offense intended).
>>>>>>
>>>>>>It's the first thing I have done myself when I started programming chess, and I
>>>>>>suspect many of us have followed the same path.
>>>>>>
>>>>>>But if somebody tells me it really works, then I have, once again, to reconsider
>>>>>>seriously all I know about chess programming.
>>>>>>
>>>>>>It's not new anyway. Every now and then I realize how little I know. That's part
>>>>>>of the fun.
>>>>>
>>>>>The program hyatt talk about is probably Junior.
>>>>>
>>>>>Uri
>>>>
>>>>
>>>>Really???
>>>>
>>>>Why do you think it's Junior?
>>>>
>>>>Junior is said to have a huge NPS. Using a SEE at the end of the tree (in every
>>>>node actually) is supposed to drop your NPS considerably...
>>>>
>>>>
>>>> Christophe
>>>
>>>I remember that amir ban said in the past that he does not think that Qsearch is
>>>a good idea.
>>>
>>>I also remember that there was a position that proved it when Junior never did a
>>>mistake at small depths that other programs did because of Qsearch.
>>>
>>>Uri
>>
>>
>>OK. I hope Amir reads this and can say if it is correct.
>
>Maybe they do a simplified qsearch where you just do recaptures on the
>destination square of the last fullwidth move? I played with this once, it
>isn't too bad. I eventually discarded it, probably for the wrong reasons :-)
I had something similar in Tiger 2 years ago: QSearch would, after some plies
(could be set to any depth), look only at captures on the last square. I
eventually discarded this after extensive testing.
Maybe you and I discarded it for the right reasons! :)
Christophe
>>I am surprised, but I like to be surprised this way.
>>
>>
>> Christophe
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