Author: Ed Schröder
Date: 06:02:47 11/11/99
Go up one level in this thread
>Posted by Eelco de Groot on November 11, 1999 at 05:15:30:
>>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 [ ]?
I believe there is no difference between upper and lower case. Be careful
with extra or missing spaces. Use the extra engine options as described
in the README file.
>2. Is there anything like "Extra Safety extensions" among the EXTENSIONS
>REMAINING (undocumented) or are these of a more aggressive nature?
"Extensions remaining" is the only one tuneable extension available at the
moment. Planned for the future are other extensions as well but things can
easily become too complicated. Maybe it already is.
>3. Is [SEARCH TECHNIQUE = SAFE] combined with [SELECTIVE SEARCH
>= 001] the closest one can get to 'brute force'?
Bull's eye :)
Ed
>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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