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

Author: Sune Fischer

Date: 20:24:24 05/13/05

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On May 13, 2005 at 16:34:24, Christopher Conkie wrote:

>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?

I've seen the 319 before with Arena so in this case I'd suspect the gui,
it does funny things on some mate scores.

-S.

>Regards
>
>Christopher



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