Computer Chess Club Archives




Subject: Re: Ruffian 0.76 is still playing incredible strong!

Author: Robert Hyatt

Date: 21:41:11 09/19/02

Go up one level in this thread

On September 19, 2002 at 23:44:16, Jeremiah Penery wrote:

>On September 19, 2002 at 19:44:22, Uri Blass wrote:
>>Here is a move of Ruffian that Crafty18.5 cannot find
>>[D]r1b1r1k1/pp3p1p/2pp2p1/8/2PNPPn1/2P3q1/P2Q2B1/R1B1R1K1 b - - 0 18
>>Ruffian played Be6 when Bf5 is the move that Crafty prefers(I do not express an
>>opinion which move is onjectively better.
>It could be a different version of Crafty that plays Be6.  Or it could be a few
>simple changes to the evaluation that make it play Be6 instead of Bf5.  It's
>almost impossible to compare a few positions in this way, because small changes
>in the evaluation (the result would still be a Crafty 'clone') can make it play
>almost completely different moves.

I agree.  The real test is in tactics.  It is not easy to make a copy of
Crafty either better or worse at tactics, but particularly making it better is
non-trivial.  It's far easier to twiddle with a few eval terms to make it
play significantly different.

Not that I think this has happened in this case, since I haven't seen any
games or output of any kind...  but making a determination of "it is or
isn't crafty" is not a few minutes work.  It takes a lot of time, even if
the executable is available for "poking around in."

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