Author: Ed Schröder
Date: 13:41:25 08/17/04
Go up one level in this thread
On August 17, 2004 at 15:33:58, Joerg Oster wrote:
>Hi Ed,
>
>would you be so kind to write a few words about the below listed parameters?
>('Adjusted Selectivity' and 'Minimum Selectivity')
>I've changed the 'Adjusted Selectivity' parameters, but couldn't see any changes
>in the calculation process of Pro Deo 1.0.
>My aim is to make Pro Deo reach higher depths in less time.
>
>Kind regards,
>Joerg.
>[Adjusted Selectivity MIDG ? 6] * Maximum selective depth (midgame)
>[Adjusted Selectivity END0 ? 5] * Maximum selective depth (early endgame)
>[Adjusted Selectivity END1 ? 4] * Maximum selective depth (endgame)
>[Adjusted Selectivity END2 ? 3] * Maximum selective depth (simple endgame)
>
>[Minimum Selectivity MIDG ? 4] * Minimum brute force depth (midgame)
>[Minimum Selectivity END0 ? 4] * Minimum brute force depth (early endgame)
>[Minimum Selectivity END1 ? 4] * Minimum brute force depth (endgame)
>[Minimum Selectivity END2 ? 4] * Minimum brute force depth (simple endgame)
The goal of the parameters is to tune Pro Deo's selective search which is a
mixture between nullnove and my own invented way of doing selective search. It
would go much too far to start explaining what these parameters actually do. For
that I refer to my Programmer Stuff page as listed on:
http://members.home.nl/matador/chess840.htm#SELECTIVE%20SEARCH
Regarding your second question, if you want a deeper search in less time
consider the following settings:
[Adjusted Selectivity MIDG = 8] * Maximum selective depth (midgame)
[Adjusted Selectivity END0 = 7] * Maximum selective depth (early endgame)
[Adjusted Selectivity END1 = 6] * Maximum selective depth (endgame)
[Adjusted Selectivity END2 = 5] * Maximum selective depth (simple endgame)
Don't expect these settings to give you an overall improvement, it's less. But
the engine will fly through the plies.
My best,
Ed
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