Dr.Wael Deeb wrote:And one more thing....Fabien didn't ask me to show where Vasik said so,so stop twisting the facts....
I asked for a link, but testimony by others would be useful for me.
Are we talking about the same thing: "Vasik said he contacted Fabien about xxx and Fabien answered it was OK for him"?
Who else remembers this? What was "xxx"?
This is not what you directly asked for Fabien, but after 5 years gone maybe there is some useful info here.
Fruit GPL chess engine controversy
Rybka has been accused of being based on Fruit, but Rajlich has denied this categorically. Further allegations of violating the GPL have been brought forward by chess programmer Zach Wegner based on a new decompilation effort and a one year study of the Rybka 1.0 executable. Vas has since declined to respond to these allegations.
 Strelka controversyIn May 2007, a new chess engine called Strelka appeared on the scene, claimed to be written by Yuri Osipov. Soon, there were allegations that Strelka was a clone of Rybka 1.0 beta, in the sense that it was a reverse-engineered and slightly modified version of Rybka. Several players found Strelka to yield identical analysis to Rybka in a variety of different situations, even having the same bugs and weaknesses in some cases. Osipov, however, stated repeatedly on discussion boards that Strelka was based on Fruit, not Rybka, and that any similarities was either because Rybka also was based on Fruit, or because he had tuned the evaluation function to be as close to Rybka as possible.
With the release of Strelka 2.0 beta, source code was included. Rajlich stated that the source made it "obvious" that Strelka 2.0 beta was indeed a Rybka 1.0 beta clone, although not without some improvements in certain areas. On basis of this, he claimed the source as his own and intended to re-release it under his own name, although he later decided not to do so. He also made allegations that "Yuri Osipov" was a pen name.
However, according to Victor Zakharov (Convekta company) in his review for Arena chess website, he said "I consider that Yuri Osipov (Ivanovich) is real name. He didn't hide it. However I can't state this with 100% assurance." And he also has some contact with Yuri Osipov for development of mobile platforms chess program.
 IPPOLIT controversyIPPOLIT, RobboLito, Igorrit, IvanHoe, FireBird and Fire are a series of strong open source chess programs, originally developed by a team of anonymous programmers who call themselves the Decembrists, after the Decembrist revolt.
The chess engine IPPOLIT was released in October 2009 with its source code. Vasik Rajlich has stated that IPPOLIT is a decompiled version of Rybka, and that the people involved kept him informed of their progress via email. Currently there is only circumstantial evidence for this claim. No legal charges have been filed against any of the engines in the IPPOLIT series. Circumstantial evidence for the claim by Vasik Rajlich is provided by the fact that the source of IPPOLIT resembles the output of a decompiler and furthermore the playing style of IPPOLIT and its derivatives is close to that of Rybka 3. Finally some people have expressed doubts that a super strong chess engine like IPPOLIT could simply appear out of nowhere.