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Subject: Re: The superior Rybka chess knowledge

Author: Uri Blass

Date: 12:51:42 01/18/06

Go up one level in this thread


On January 18, 2006 at 15:30:03, Ross Boyd wrote:

>On January 18, 2006 at 15:05:36, Dann Corbit wrote:
>
>>On January 18, 2006 at 14:39:40, Fernando Villegas wrote:
>>
>>>Some days ago I talked of knowledege to know which knowledge is irrelevant as a
>>>probable feature of Rybka. And almost nobody answered or commented my post.
>>>Surely it is an advantage to be a chess programmer in a site like this.
>>
>>Probably the only one who can answer correctly is the author.
>>
>>But you can look at some interesting generalizations.
>>
>>I have found that some evaluation terms add nothing either to the EPD solution
>>count or the contest point gathering effectiveness of an engine.
>>
>>An example is queen mobility.  I don't know of any logical reason why its
>>computation should not help, but it doesn't.
>>
>>I have seen other chess engine authors come to the same conclusion.
>
>Agreed. I do pseudo mobility only for bishops and knights. Queen mobility
>improves nothing. However, I do piece-square so the queen knows about
>centralisation.

For me it is the opposite about queen.

I do not have piece square table for centralization of the queen but I have
mobility for all pieces.

I have piece square table for the queen but it is not about centralization and I
do not know if it is productive(probably I will need a lot of games to test it
because my piece square table only change the value of queen by at most 0.1 pawn
and it does not change the value of queen in most squares).

Here is my piece square table for the queen(a8 a7 a2 a1 h8 h7 h2 h1 considered
to be relatively bad squares for the queen when h6 a6 considered to be good
squares for the white queen because it may help in mate attacks in these
squares).

queen_square_table 990  1000  1000  1000  1000  1000  1000  990 990  1000  1000
1000  1000  1000  1000  990 1010  1000  1000  1000  1000  1000  1000  1010 1000
1000  1000  1000  1000  1000  1000  1000 1000  1000  1000  1000  1000  1000
1000  1000 1000  1000  1000  1000  1000  1000  1000  1000 990  1000  1000  1000
1000  1000  1000  990 990  1000  1000  1000  1000  1000  1000  990

Uri



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