OpenChess

how hard is it to reverse engineer?

why haven't fritz, hiarcs, and shredder been reverse engineered like rybka? strong parts of the different codes can be mixed together to produce a more complete engine.

Actually, there were rumors that different parts of the clones were taken from de-compilation of different engines, making them Frankensteins.

Ovyron wrote:Actually, there were rumors that different parts of the clones were taken from de-compilation of different engines, making them Frankensteins.

Not true, Rybka had Fruit source code readily available to copy so it was not reverse engineering.

brownsmith89 wrote:how hard is it to reverse engineer?

Is not easy, requires understanding of the subject being RE, and good programming skills (mostly in assembly). Some applications have made it easier, but still not trivial.

brownsmith89 wrote:why haven't fritz, hiarcs, and shredder been reverse engineered like rybka? strong parts of the different codes can be mixed together to produce a more complete engine.

They probably have been.

kingliveson wrote:

Ovyron wrote:Actually, there were rumors that different parts of the clones were taken from de-compilation of different engines, making them Frankensteins.

Not true

Any proof that the clones don't contain Shredder code?

Ovyron wrote:

kingliveson wrote:

Ovyron wrote:Actually, there were rumors that different parts of the clones were taken from de-compilation of different engines, making them Frankensteins.

Not true, Rybka had Fruit source code readily available to copy so it was not reverse engineering.

Any proof that the clones don't contain Shredder code?

I wouldn't know if Rybka contains Shredder code or not. But we know it contains Fruit code.

I'm not talking about Rybka, I'm talking about the clones.

There was evidence that Ippolit did, as in, a long patch of moves where the evaluation score followed Shredder's score exactly, but nobody has disassembled Shredder to take a look for similarities.

64x wrote:They probably have been.

i guess you're right. it makes more sense that robbolito is a combination of codes that was able to beat rybka 3, instead of the notion that rybka 4 beta was stolen.

i kept hearing about rybka clones and nothing about the other commercial engines, so i was ignorant.

Please note that I am not referring to any particular engine, either been cloned or been a clone.

I only say that any engine can be target of RE, and that the _IDEAS_ obtained can be (or have been) implemented in _ANY_ other engine.

That could have happened many times and since a long time ago.

Ovyron wrote:There was evidence that Ippolit did, as in, a long patch of moves where the evaluation score followed Shredder's score exactly

can u link to the thread about this?