Author: Christophe Theron
Date: 15:53:04 12/27/01
Go up one level in this thread
On December 27, 2001 at 13:35:00, Martin Giepmans wrote:
>On December 27, 2001 at 12:46:39, Christophe Theron wrote:
>
>>On December 27, 2001 at 12:07:35, Martin Giepmans wrote:
>>
>>>On December 27, 2001 at 08:43:35, Uri Blass wrote:
>>>
>>>>On December 27, 2001 at 08:15:08, K. Burcham wrote:
>>>>
>>>>>
>>>>>I guess that you missed the following post about spidderchess that needed less
>>>>>than 1 second
>>>>>
>>>>>http://www.icdchess.com/forums/1/message.shtml?203638
>>>>>
>>>>>Uri
>>>>>
>>>>>
>>>>>Uri, did you believe this?
>>>>
>>>>Yes
>>>>
>>>>>it has to be either for the wrong reason, or the program was run after
>>>>>position learning. we know for the necessary calculations, this position
>>>>>cannot be determined in one second.
>>>>
>>>>Maybe you know it
>>>>I do not know it and I believe the programmer.
>>>>
>>>>I believe that it is not impossible to do it and
>>>>the fact that other programs are not close to do it
>>>>means nothing.
>>>>
>>>>It is possible that spidderchess use different search rules
>>>>than other programs.
>>>>
>>>>I also plan to use different search rules
>>>>that are going to help my program to solve it faster but
>>>>I need to compare them with the known search rules
>>>>also in other positions before deciding if
>>>>it is a good idea to use them.
>>>>
>>>>
>>>>Uri
>>>
>>>
>>>It's indeed true that SpiderChess uses different searchrules.
>>>I try to simulate the human chessplayer. I try ...
>>>And in this position it works! Now all those other positions :)
>>>
>>>Martin
>>
>>
>>
>>Yes from looking at the PV and the nominal search depth it looks like
>>SpiderChess does not stop at the nominal depth. For example IIRC at ply depth 5,
>>the PV was 13 plies long (not ending with captures or checks).
>>
>>Or maybe ply depth 5 means that the first 5 plies are looked at in "brute force"
>>mode, and the next plies with a selective search? That's how Genius displays its
>>depth, so SpiderChess depth cannot be compared with other programs depths?
>>
>>
>>
>> Christophe
>
>
>Hi Christophe,
>
>What you see beyond the nominal depth are extensions. There is some
>selectivity before that but not much. The program doesn't use nullmove.
>Extensions may go very deep along narrow, more or less human paths, so if the
>program says "depth = 6" you cannot really trust that.
>But it's probably not the same as Genius.
>
>Martin
When you say "extension", does it mean the kind of extension everybody does on
recapture or check (not counting the move in the ply count), or do you mean a
different kind of extensions, something like "I have reached my horizon but this
position is not quiet at all, so I do not stop here"?
Christophe
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