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Subject: Re: CCC Retirement

Author: Robert Hyatt

Date: 08:28:55 01/16/06

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On January 16, 2006 at 04:05:35, Fabien Letouzey wrote:

>On January 14, 2006 at 17:50:34, Robert Hyatt wrote:
>
>>If you think "mobility" is what makes fruit, you are _sadly_ mistaken.
>
>Hi Bob,
>
>I'd love to hear your opinion on this one!
>
>Fabien.


Good search.  Reasonable evaluation.

Why?

The _first_ version of Crafty, when I used the original Slate/Atkin bitboards
including both attacks_from and attacks_to, used mobility exclusively (in
addition to material and pawn structure of course) to begin with.  Then I added
various forms of mobility including different values for mobility to different
squares, etc.  That, by itself, is _not_ enough to play strong chess.  Mobility
has been around forever.  We used it significantly in Cray Blitz since it is far
easier/cheaper to calculate on a vector machine.  But that, by itself, won't
produce programs that play as we see today, Fruit included...

Hope that helps explain where my comments come from.  Mobility certainly might
help it play well.  But it is not _the_ reason it plays well...




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