Author: Eelco de Groot
Date: 02:15:30 11/11/99
Go up one level in this thread
On November 11, 1999 at 01:30:29, Tina Long wrote:
>On November 11, 1999 at 00:11:28, Ed Schröder wrote:
>
>>On November 10, 1999 at 17:28:21, blass uri wrote:
>>
>>>On November 10, 1999 at 16:19:55, Jeroen van Dorp wrote:
>>>
>>>>Hiarcs 128Mb hash - hiarcs.ctg
>>>>Rebel Century 100Mb hash - Rebel EOC (chess knowledge 500)
>>>>
>>>>I haven't got the patience to play 40/2 games manually :(
>>>
>>>It is known that Hiarcs is good at fast time control
>>>and I guess that chess knowledge 500 is not a good idea(Ed may be wrong about
>>>the best chess knowledge for Rebel but not a very big error).
>>>
>>>Uri
>>
>>The [Chessknowledge = 500] setting will force Rebel to slow down with
>>a factor of 5 to 8 typically. That's why the default setting is 100.
>>
>>Ed
>
>Hi Ed,
>True or False?
>Knowledge = 500
>is very good (better than 100) for analysing a single position for two hours;
>is very bad for playing at 5 seconds per move;
>
>Thanks
Not Ed here, but I think that has to be right, Tina. Maybe Jeroen is just trying
to draw us out? :)
Ed mentioned that if you set [Selective Search = 001] the speed in nps will go
down even more but for overnight searches this maybe could still be used to
avoid any oversights by pruning. I think that must be close to a 'brute force'
search then, and you could use it if you know that the position could have some
'unlikely' moves in the solution , a study for instance. On the other hand there
is also [SEARCH TECHNIQUE = SAFE], one of the 'undocumented' options (see Rebel
Century Miscellaneous page) that "will slow down the search by 20%" so maybe
that is even closer to 'brute force'.
But I remember that Ed once said that a normal selectivity was good enough
nowadays also for overnight analysis so I wonder if the default [Selective
Search=100] isn't better for your everyday game situations.
For Blitz you are probably right that 'depth' is probably better than
'knowledge', Tina... But maybe only up to a point? If you know that you will be
playing against a tactical monster might a more positional style and knowledge
not be what could save you then? Then you would also like to have something
like Safe Quiescense Extensions ("There is no danger here", trying to steer away
from deep tactical shots) looking mainly at exchanges initiated by the opponent
maybe, plus tactical threats by the opponent. An idea for the programmers maybe,
only become more daring if the Safety Extensions give the green light? Don't
know if that would mix well with null-move...
The only thing in the Rebel Century personality options that by its description
seems to bear some resemblance to this is [MORE SPEED = LOWER SELECTIVE SEARCH],
another 'undocumented' option so maybe that is something to try out if someone
wants to make a positional BLITZ_PERSONALITY.
So I had a few questions for Ed also;
1. Can we use lowercase characters and excess spaces in the personality
definitions between [ ]?
2. Is there anything like "Extra Safety extensions" among the EXTENSIONS
REMAINING (undocumented) or are these of a more aggressive nature?
3. Is [SEARCH TECHNIQUE = SAFE] combined with [SELECTIVE SEARCH = 001] the
closest one can get to 'brute force'?
Anything you would like to say about this is highly appreciated, Ed!
Hi all!
Took me well over an hour to write this down, really should stop now...
Eelco
Link to CCC Navigator, in case anyone was wondering were to find it:
http://www.geocities.com/SiliconValley/Campus/9925/cchess.htm
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