Rybka

Rybka is a chess program created by International Chess Master Vasik Rajlich. The word means "little fish" in Czech. He made himself known in the small world of electronic chess by releasing a free Beta version of the program, Rybka 1.0, in December 2005. This version had a very aggressive behavior and although it had many bugs, especially in the final, it had a much higher level than other programs. Rybka had an original beginning of commercialization: the buyers benefited almost live from the improvements and bug fixes at the rhythm of the numerous versions released. In preparation for the 2006 World Computer Chess Championship (WCCC), Rybka's behavior has been modified: he now adopts a positional style, accumulating small strategic advantages in the middle of the game. Like any chess software, it takes advantage of the opponent's weaknesses. It is not a program optimized for tactical strength: it chooses the quietest variants and may not see some mates.

In January 2009, it was ranked first in the ranking of commercial chess programs established by the Swedish Chess Federation. Since June 10, 2006, Rybka has been available with the use of one and more processors.

Vasik, Hacker
On June 28, 2011, after investigation, the International Computer Games Association concluded that Rajlich had plagiarized two other chess programs: Crafty and Fruit9. 9 The ICGA stripped Rybka of his 2006-2010 World Computer Chess Championship titles and excluded Rajlich for life from any ICGA-organized or sanctioned event. 10,11 Rajlich had previously responded to these accusations in a May 13, 2011 email to ICGA President David Levy: "Rybka 'does not contain any playing code written by others', apart from established exceptions that do not count as 'playing code'. ...] The vague phrase "derived from gambling code written by others" does not apply to Rybka, in my opinion. »

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