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 Federation1. Since June 10, 2006, Rybka has been available with the use of one and more processors.