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Rybka

This article is about the chess engine. For other uses, see Rybka (disambiguation).

Rybka
Developer(s)Vasik Rajlich
Stable release
4.1 / March 5, 2011 (2011-03-05)[1]
Operating systemWindows
TypeChess engine
LicenseProprietary
Websiterybkachess.com
This article is part of the series on
Chess programming
Board representations
Evaluation functions
Graph and tree search algorithms
Chess computers
Chess engines

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[2][3][4][5][6] 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[7][8] and so failed to meet their originality requirements.[9] 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.[10][11]

ChessBase published a challenging two-part interview-article[12] about the process and verdict with ICGA spokesperson David Levy. Subsequently, ChessBase recruited Rejlich to produce Fritz 15 (released in late 2015)[13] and Fritz 16 (released in late 2017).[14]

  1. ^ Rajlich, Vasik (March 5, 2011). "Rybka 4.1 Release Notes". Rybkaforum.net. Archived from the original on March 5, 2012. Retrieved March 27, 2014.
  2. ^ "CCRL 40/40 – Pure list". July 3, 2010. Archived from the original on February 17, 2012. Retrieved July 12, 2010.
  3. ^ "CEGT 40/20". Chess Engines Grand Tournament. July 11, 2010. Archived from the original on March 8, 2011. Retrieved July 12, 2010.
  4. ^ "The SSDF Rating List". Swedish Chess Computer Association. March 21, 2010. Retrieved July 12, 2010.
  5. ^ "Bayesian Elo Ratinglist WBEC Ridderkerk edition 1 – 16". September 22, 2009. Retrieved April 27, 2010.
  6. ^ IPON Archived June 12, 2011, at the Wayback Machine; Ponder ON Rating list
  7. ^ Riis, Søren (August 1, 2014). "What makes a chess program original? Revisiting the Rybka case". Entertainment Computing. 5 (3): 189–204. doi:10.1016/j.entcom.2014.04.004.
  8. ^ Dailey, D.; Hair, A.; Watkins, M. (August 1, 2014). "Move similarity analysis in chess programs". Entertainment Computing. 5 (3): 159–171. doi:10.1016/j.entcom.2013.10.002.
  9. ^ Doggers, Peter. "Rybka disqualified and banned from World Computer Chess Championships". Chess Vibes. Archived from the original on March 30, 2014. Retrieved June 29, 2011.
  10. ^ "FIDE Ethics Commission Judgement Case n. 2/2012" (PDF). FIDE.
  11. ^ Schröder, Ed. "Rybka controversy - FIDE complaint and verdict". Archived from the original on May 18, 2015.
  12. ^ "ChessBase-ICGA interview". February 10, 2012.
  13. ^ "Come and get it – Fritz 15 released!". November 25, 2015.
  14. ^ "Fritz 16 - your companion and trainer". Chess News. November 12, 2017.

Rybka

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