Author: Uri Blass
Date: 17:28:47 02/15/05
Go up one level in this thread
On February 15, 2005 at 19:31:58, Dann Corbit wrote: >On February 15, 2005 at 18:38:43, John Merlino wrote: > >>I'm not trying to start a brutally long thread here, but I'm just curious about >>how people feel about a particularly touchy subject -- clones. What, in your >>mind, would lead you to the conclusion that an engine is a clone? >> >>Let's forget trying to find ways to PROVE that a clone is a clone; I'm just >>trying to define one. For the sake of argument, assume that the author of this >>engine in question tells you exactly what he did and did not do, and you must >>decide whether to call it a clone or not. >> >>Here are some hypothetical questions to start the debate: >> >>If the author took Crafty and completely rewrote the evaluation code and nothing >>else, would it be a clone? > >Yes. If you violate the rules of the software agreement, it is clearly a clone. > >>How about if the author rewrote the evaluation code and search algorithm only, >>but left the hashing code, et. al.? > >Clone. > >>How about if the author rewrote everything EXCEPT for the evaluation? > >Clone. > >>How about if the author rewrote everything EXCEPT for Crafty's evaluation of >>passed pawns? > >Clone. > >>I think you can see where I'm driving. Obviously, many engine authors have >>studied Crafty and other engines whose authors have graciously provided their >>source code. But, for an engine to not be considered a clone, does it have to be >>absolutely 100% the work of the author? (Forget about Nalimov's EGTB probing >>code and any other code that can be used with permission). >> >>Many thanks in advance for your thoughts, >> >>jm (who's just preparing for any eventuality during his upcoming stint as >>moderator :-) > >If there is one single line of Crafty code used without permission or >acknowledgement then it is a clone. No There can be one single line even by accident. one line from Crafty's code is int phase; You cannot blame every program that include this line to be a crafty clone. Uri Uri
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