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Subject: Re: Basics of Programming Computerchess and Forbidden "Cloning"

Author: Christopher Conkie

Date: 13:34:24 05/13/05

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Hello Dann,

May I ask something please?

I'm looking at the moment at the evaluations of various engines in many, many
positions. Some are legal, some illegal and some are so illegal that you might
think them designed by a madman. There is a little bit of madness in all of us
however.

If one found an engine had a very similar evaluation to another for example take
Skaki 1.19 which is still available....and then found that in 95% of positions
the same or very similar positions it reacted in the same way to another
engine....and then....if one took that and examined dates and release
times.....and.....found that there was a plausible and very real similarity
between the two.

Would that be at least halfway (if not much more) to an assumption that it was
one and the same (albeit developed further).

[D]rnb1K1nr/ppppPppp/8/8/8/8/PPPPpPPP/RNB1k1NR b - - 0 1

Skaki 1.19:
   7	00:00	      18.078	200.866	+319.00	Nh6+
   8	00:01	      60.124	150.310	+319.00	Nh6+
   9	00:01	     196.661	196.661	+319.00	Nh6+

I do not wish a witch hunt but by the same token wish that the kettle should not
ever attempt to call the pot black again.

I was examining alot of engines....

http://www.talkchess.com/forums/1/message.html?425805

....as you can see.....

There are broken evals and exactly the same evals, in the same positions.

The figure +319 occurs in at least two engines and they show exceptionally
similar evals in many many positions.

The dates fit as well.

I would have sent you a mail but this topic seems to fit like a glove.

What do you think and where does the smashing figure of +319 come from exactly?

Regards

Christopher



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