Rybka Chess Engine: The Most Powerful and Accurate Chess Program for Download
Play chess and analyze the gameplay of top grandmasters using this chess engine. Compete against a computer or join international tournaments and play against real users. Select among unique or popular scenarios and automatically update the database.
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Deep Rybka 4 UCI is the world champion of chess engines with a rating of 3250+ points ELO. The main developer of the program - international master Vasik Rajlich has inserted the algorithms of positional estimation into it which are as close to the chess-players style of thinking as possible.
The results produced by the Monte Carlo analysis are not like the usual position evaluation of chess engines. In our example above Rybka is telling us that statistically White can be expected to score 65.3% if Black plays 16...Qa5, and 60.6% if he plays 16...h6 (evaluations are always given from the point of view of White). Since the games are played all the way to a decision the long-term chances are better evaluated than in a traditional search.
Note that Rybka 3 includes a database of one million games, and that the purchase of the program entitles you to one year of access to the chess server Playchess.com. Rybka 3 is a UCI engine, with 32 and 64-bit versions included in the package. Rybka can be made the default engine in ChessBase 10.
Rybka is a computer chess engine designed by International Master Vasik Rajlich. Around 2011, Rybka was one of the top-rated engines on chess engine rating lists and won many computer chess tournaments.
After Rybka won four consecutive World Computer Chess Championships from 2007 to 2010, it was stripped of these titles after the International Computer Games Association concluded in June 2011 that Rybka was plagiarized from both the Crafty and the Fruit chess engines and so failed to meet their originality requirements. In 2015, FIDE Ethics Commission, following a complaint put forward by Vasik Rajlich and chess engine developer and games publisher Chris Whittington regarding ethical breaches during internal disciplinary proceedings, ruled the ICGA guilty and sanctioned ICGA with a warning. Case 2/2012.
Rybka 3 was released on August 6, 2008. While previous versions of Rybka were released exclusively by Convekta, Rybka 3 was released by both Chessbase and Convekta. Although still a UCI engine, Rybka 3 has extra features when run under the ChessBase and Convekta user interfaces. In an interview with Frank Quisinsky, Vasik Rajlich revealed plans for a future GUI that would "properly display chess knowledge to the user" most likely in the form of graphical evaluation of the pieces on the board. The GUI, named Aquarium, has been released by ChessOK (formerly known as Convekta).
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In May 2007, a new chess engine called Strelka (Russian for "arrow") 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.
The chess engine IPPOLIT was released in May 2009 with its source code, but due to the policy of some chess forumsnot to publish material of "questionable legal status" (e.g. the Talkchess charter ) it remained relatively unknown until October 2009. 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.
Rybka,a chess engine by primary author Vasik Rajlich, from 2007 until 2010 dominating and reigning World Computer Chess Champion and holder of the Shannon Trophy, winning the WCCC 2007  , WCCC 2008, WCCC 2009 and WCCC 2010, but in June 2011 disqualified by the ICGA from all previous and future World Computer Chess Championships. Rybka further won various IPCCC, Dutch Open Computer Chess Championships, International CSVN Tournaments and on-line tournaments such as CCT Tournaments and ACCA Americas' Computer Chess Championships. Rybka is a standalone chess engine supporting the UCI protocol.
Vasik Rajlich started developing Rybka in about 2003, and worked full-time on it since 2005. The appearance of the free Rybka 1 beta  and the first commercial version, Rybka 1  end of 2005 was a sensation, and Rybka soon became the dominating program leading rating lists by a huge margin   . Rybka 3 was developed in collaboration with Larry Kaufman, the most recent and strongest version Rybka 4 and the parallel version Deep Rybka 4 appeared in April 2010, market as standalone chess engine from RybkaChess.com  , from ChessOK optional with the Aquarium GUI  , or from ChessBase packaged with the Fritz GUI  . The demo version Rybka 2.3.2a can be downloaded for free  .