1023:. However, due to an incorrect evaluation by the Rybka engine, at move 109 it moved a pawn to avoid a draw (even though Zappa could, and did, immediately take the pawn), thus resetting the counter for that rule. The loss of the pawn eventually allowed Zappa to whittle away Rybka's defenses and win the game. Then in game 9, Rybka was 3 pawns up with a totally won position, but played a horrific blunder on move 71, "the worst blunder in modern computer chess", as it lacked sufficient knowledge to see a draw would ensue by
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1226:. 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
1208:, including copying specific bugs - such as comparing the result of the EvaluateMate function to a number, 99999, that it could not possibly return - and unnecessary code ("there is no earthly reason for any program that claimed to have been started in 2003 to have such code, other than that it was mindlessly copied from Crafty without the slightest understanding of its purpose").
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1330:(WCCC) of 2006, 2007, 2008, 2009 and 2010. Vasik Rajlich was also banned for life from competing in the WCCC or any other event organized or sanctioned by the ICGA. In addition, the ICGA demanded that Vasik Rajlich return to the ICGA the four replicas of the Shannon Trophy presented at the WCCC in 2007, 2008, 2009 and 2010 and all
853:, the winning 2006 World champion. In the June 2006 PAL/CSS Freestyle main tournament, the Rybka team, playing under the handle Rajlich, tied for first place with Intagrand. In the final, the Rybka team took clear first place, a point ahead of the field. All 8 qualifiers for to the final were Rybka users. In the 2006
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which is a special version of Rybka (4+ or cluster) on very powerful hardware / clusters run by Lukas
Cimiotti. This can be rented for a specific period of time, though currently not less than 2 days due to overhead costs. Upon renting one has access to the Remote Rybka from one's PC, and all details
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of 2705, ranking him 28th in the world. The result was a narrow victory to Milov: In two standard games (Milov played White, no odds), Milov lost the first game and drew the second one. Then they played two games at the classical "pawn and move" handicap (f7 removed). The first game ended in an early
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I need not tell you that the ICGA made a terrible mess. On our site last August we declared we will not accept the Rybka ban. The computer chess world is split in two. At this time the CSVN board has the most serious doubts as to the rightfulness of ICGA's decision. Therefore, we have chosen not to
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In response, 10 former participants of CSVN events published an open letter on
September 21, 2011, accusing the CSVN of "lack of judgement", personally singling out and criticising the Chairman Cock de Gorter "your ... tournaments are not in good hands anymore" and announcing their withdrawal from
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and a Rybka forum moderator, was critical of the ICGA's decision, the investigation, the methods on which the investigation was based, and the bias of the panel members and
Secretariat. Riis argued that critical portions of the ICGA panel report that appeared to show line-by-line code duplication
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According to Victor
Zakharov (Convekta company) in his review for Arena chess website: "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
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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 the basis of this, he claimed the source as his own and intended to
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The match came about after Vasik
Rajlich made a $ 100,000 publicity challenge to the FIDE champion Fritz or Junior, even offering odds of a game in a 24-game match (13 points). But negotiations between Rybka and Junior broke down due to disputes over on-site machines. The match was changed to 10
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Those who were in favour of the sanctions were severely questioned by (e.g.) Miguel A. Ballicora, George
Speight and Søren Riis. Their opposition did make an impression on us, because these people can rely upon a vast expertise in the field of chess programming, law and mathematical logic. When
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research fellow in mathematics Mark
Watkins responded to Riis' publication with their own statements defending the ICGA panel and findings, respectively. ChessBase published a lengthy list of Reader Comments to the Riis article, specifically pointing to the two longest comments, one for and one
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The ICGA President David Levy has addressed the situation at ChessVibes and invoked a programmers forum to decide the merits. The options include revoking all tournament victories of Rybka by
Statute 3.h.iv. Fourteen well-known chess programmers have since written an open letter to David Levy,
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The chess engine IPPOLIT was released in May 2009 with its source code, but due to the policy of some chess forums not 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
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of the entering developer and those "whose code is derived from or including game-playing code written by others must name all other authors, or the source of such code, in their submission details". The ICGA regarded Vasik Rajlich's alleged violation as the most serious offence that a chess
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based on a new decompilation effort and a one-year study of the Rybka 1.0 executable. Rajlich has since declined to respond to these allegations. The Fruit author Fabien Letouzey has since appeared from a 5-year absence in January 2011 and published an open letter asking for more information
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Ethics Commission, as co-signed by Soren Riis, Ed Schröder and Chris Whittington. In 2015, the FIDE Ethics Commission ruled the International Computer Games Association ICGA guilty of ethical breaches during internal disciplinary proceedings and sanctioned the ICGA with a warning.
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On publication of the ICGA verdict and sentence, extensive disagreement broke out on Computer Chess Forums, centering on correct application of Abstraction-Filtration-Comparison test, the differences between copying ideas and copying code and bias in investigation.
643:. Vasik Rajlich was once asked in an interview by Alexander Schmidt, "Did you choose the name Rybka because your program always slipped out of your hands like a little fish?" He replied, "As for the name Rybka – I am sorry but this will remain my private secret."
599:, 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.
1027:. Zappa had this knowledge, took advantage, and drew the game. Anthony Cozzie thanked his operator Erdogan Gunes for having the wherewithal to stay until the end in these two games, rather than agree to a draw in game 4 or resign in game 9.
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draw by perpetual check, while the second was won by Milov. Finally they played four games at odds of the exchange (Rybka removed a1 rook, Milov b8 knight); here Rybka drew three times and lost once. The final score was 4.5–3.5 for Milov.
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In January 2004, Rybka participated in the 6th Programmers Computer Chess Tournament (CCT6) event, placing 53rd out of 54 competers, losing 5 games, drawing 3, and beating the last-place finisher who had 0 points (Tohno).
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searcher with a relatively large aspiration window. It uses very aggressive pruning, leading to imbalanced search trees. The details of the evaluation function are unknown, but since version 2.3.1 it has included work by
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Rybka participated in Chess War VI finishing 42nd in the D Division. Rybka participated in Chess War VII finishing 48th in the C Division. Rybka participated in AEGT round 3, scoring 89 wins, 28 losses and 15 draws.
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Information from the last video interview by Vasik Rajlich indicated that Rybka 5 was scheduled to arrive anywhere between the end of 2011 and the first half of 2012. As of April 2022, this never occurred.
1256:, 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
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between Rybka and Fruit were misleading or falsified, and objected to the panel's and Secretariat's composition, suggesting that it consisted almost exclusively of rival chess programmers who had a
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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.
959:. GM Jaan Ehlvest was again chosen to play Rybka, getting twice the thinking time and white every match, with Rybka having only a three-move opening book, limited (512MB) hash size, and no
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in June 2007 with a score of 10 out of 11. The Rybka team, playing under the handle Rajlich, won the June 2007 PAL/CSS Freestyle final with a score of 6/9. Later that year it won again the
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1230:, 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.
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published a challenging two-part interview-article about the process and verdict with ICGA spokesperson David Levy. Subsequently, ChessBase recruited Rejlich to produce
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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
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programmer and ICGA member can commit with respect to his peers and to the ICGA. The ICGA sanction for Vasik Rajlich and Rybka was the disqualification from the
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This was a version swiftly produced after the ICGA investigation was announced, to ensure no infidelities in code sourcing. It was released on March 5, 2011.
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Rajlich responded to the ICGA's allegations in a video interview with Nelson Hernandez, and answered questions about the controversy and his opinions on it.
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and the ICGA board stating that there is now "overwhelming evidence" that Rybka 1.0 beta (the first strong Rybka version) was directly derived from Fruit.
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In February 2007, Rybka participated in the CCT9 and won with 6/7. In the 7th Leiden ICT in May 2007, Rybka won with a score of 7½ out of 9, ahead of
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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
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In April 2004, Rybka participated in the Swiss System Season 3 by Claude Dubois, scoring 6 wins, 6 losses and 6 draws in the Top 200 to finish 71st.
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finally dutchman Ed Schröder, former world computer chess champion, joined the aforementioned critics of ICGA, we no longer seemed to have a choice.
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5th Livingston Chess960 Computer World Championship 2009 at Mainz. The 4 programs Deep Sjeng, Shredder, Rybka and Ikarus (with the programmers).
1280:, but Rajlich has denied this categorically, saying that Rybka is 100% original at the source code level. Further allegations of violating the
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Fruit author Fabien Letouzey expressed in the open letter mentioned above that Strelka 2.0 beta is a Fruit derivative with some minor changes.
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Rybka 3 was released on August 6, 2008. While previous versions of Rybka were released exclusively by Convekta, Rybka 3 was released by both
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Full chess analysis packages which include Rybka 4 will be made by ChessBase (www.chessbase.com) and Convekta/ChessOK (www.chessok.com).
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in seeing Rajlich banned from competition in order to interrupt his unbroken domination of competitive computer chess. ICGA President
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main tournament, an unaided Rybka 1.1 took first place. In the final tournament, Rybka 1.1 finished in second and third place, behind
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Vasik Rajlich started working on his chess program at the beginning of 2003. The first Rybka beta was released on December 2, 2005.
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963:(the match being dubbed "Everything but a pawn"). The match, again played in 2007, ended 4.5–1.5 after three Rybka wins and three
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is the 2008 Senior Chess World Champion, and from version 2.3 through version 3 was in primary charge of the evaluation function.
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1019:. Two famous games were played in this match. The first was the 180-move fourth game, which was approaching a draw under the
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re-release it under his own name, although he later decided not to do so. He also made allegations that "Yuri Osipov" was a
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2007:
857:, Rybka 2.2 finished in first place with a perfect score of 9 out of 9. In December 2006, Rybka participated in the 16th
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On June 28, 2011, the International Computer Games Association (ICGA) concluded their investigation and determined that
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1321:. According to ICGA, Vasik Rajlich failed to comply with the ICGA rule that each computer chess program must be the
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In April 2004, Rybka participated in Chess War V conducted by Olivier Deville, finishing 23rd in the D Division.
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and Convekta user interfaces. In an interview with Frank Quisinsky, Vasik Rajlich revealed plans for a future
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790:. Rybka won the tournament with a score of 5½ points out of 7, ahead of other engines such as Gandalf,
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In January 2008, Rybka tied for first place in CCT10 with 5.5/7. In October 2008, Rybka won the 16th
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in February 2006, Rybka won with a score of 8 out of 9, going undefeated. In the April 2006 PAL/CSS
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Dailey, D.; Hair, A.; Watkins, M. (August 1, 2014). "Move similarity analysis in chess programs".
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Plain Rybka 4 UCI without GUI for download only is available from RybkaChess (www.rybkachess.com).
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was released May 26, 2010. Vasik Rajlich has given the following information at the Rybka forum:
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Riis, Søren (August 1, 2014). "What makes a chess program original? Revisiting the Rybka case".
895:, scoring 8/9. A month later Rybka won the 27th Open Dutch Computer Chess Championship, held in
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version of Rybka, and that the people involved kept him informed of their progress via email.
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with pawn and move odds. The result was 4–4, after two Rybka wins, four draws and two losses.
1374:
In 2012, Vasik Rajlich filed a complaint against the ICGA decisions, process and bias to the
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All of these versions of Rybka 4 will be identical and can be used in any UCI-compliant GUI.
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of the Rybka team has pledged his own money to a human GM who can beat Rybka in a six-game
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Rybka is a closed-source program, but still some details have been revealed: Rybka uses a
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on material imbalances, much of which was worked out in a series of papers in the 1990s.
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829:. In the 6th Leiden ICT in May 2006, Rybka won with a score of 8½ out of 9, ahead of
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2912:"Cock de Gorter-CSVN response to ICGA demand to ban Rybka from CSVN tournaments"
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698:, Vasik Rajlich's wife and the main Rybka tester is a Women's GM (WGM) and IM.
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2341:"Another Conversation with Vasik Rajlich" By Nelson Hernandez (on Rybka chess)
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chess engines and so failed to meet their originality requirements. In 2015,
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games against Zappa, with $ 10,000 the amount eventually paid to the winner.
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players. Both are now less active, and Jiri Dufek is in charge of the book.
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Cock de Gorter, Chairman of Dutch Computer Chess Association (CSVN) wrote:
1353:.com published an article by Dr. Søren Riis. Riis, a computer scientist at
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974:, its strongest opponent yet in an odds match. Milov at the time had an
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1639:"Rybka disqualified and banned from World Computer Chess Championships"
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1222:(Russian for "arrow") appeared on the scene, claimed to be written by
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In May 2010, Rybka won the International Computer Chess Tournament in
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Tech World: World's best chess program loses titles in plagiarism row
2700:
Rybka disqualified and banned from World Computer Chess Championships
2690:. Hurriyet Daily News (June 30, 2011). Retrieved on October 12, 2013.
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2156:"Rybka (Computer) vs Zappa (Computer) (2007) "Mothers of Invention""
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2565:. Rybkaforum.net (October 21, 2009). Retrieved on October 12, 2013.
2328:. Rybkachess.com (February 1, 2011). Retrieved on October 12, 2013.
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Early private Rybka engines have been accused of being a clone of
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There are separate single-processor and multi-processor versions.
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15 (released in late 2015) and Fritz 16 (released in late 2017).
267:
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Rybka, the world’s best chess engine, outlawed and disqualified
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1314:
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861:. Rybka won the tournament with a score of 6½ points out of 7.
690:, the main author of Rybka is an International Master (IM). GM
588:
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2753:. Extreme Tech (June 29, 2011). Retrieved on October 12, 2013.
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2343:. Youtube.com (July 12, 2011). Retrieved on October 12, 2013.
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Several members of the Rybka team are strong chess players:
19:
This article is about the chess engine. For other uses, see
2490:. Ippolit.wikispaces.com. December 26, 2010. Archived from
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In March 2007, Rybka played an eight-game match against GM
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in Turin, Italy in May 2006, Rybka, playing under the name
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PGNs of game 3 and 4 with Rybka evaluation, Zappa won both
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1753:. Superchessengine.com. December 20, 2005. Archived from
1281:
572:. Around 2011, Rybka was one of the top-rated engines on
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Computer-Chess Club Charter – Please Read Before Posting
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2254:
1539:"Bayesian Elo Ratinglist WBEC Ridderkerk edition 1 – 16"
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Rybka 4 is a normal UCI engine, without copy protection.
123:
1953:
ChessWar VII C 40m/20' – Final standings after round 11
902:
In March 2009, Rybka won CCT11 with 7.5/9 and the 17th
2688:'Cheating' computer disqualified from chess tournament
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1941:
ChessWar VI D 40m/20' – Final standings after round 11
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In September 2008, Rybka played an odds match against
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Programmers write open letter about Rybka-Fruit issue
2596:. Webspace.utexas.edu. Retrieved on October 12, 2013.
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Rybka competed in the 2012 CSVN event (ICT) and won.
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2741:. News.techworld.com. Retrieved on October 12, 2013.
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2927:. Computerschaak.nl. Retrieved on October 12, 2013.
2809:"No Miscarriage of Justice – Just Biased Reporting"
924:
859:
International Paderborn Computer Chess Championship
788:
International Paderborn Computer Chess Championship
2783:"A Gross Miscarriage of Justice in Computer Chess"
2722:. Washington Times. Retrieved on October 12, 2013.
2475:View topic – Fabien's open letter to the community
1978:"26th Dutch Open Computer Chess Championship 2006"
1334:awarded for Rybka's performances in those events.
1138:
2638:The ICGA Clone and Derivative Investigation Panel
1967:. Iggor.110mb.com. Retrieved on October 12, 2013.
1665:"FIDE Ethics Commission Judgement Case n. 2/2012"
1609:
1133:
944:which involved giving pawn odds to the human, GM
786:In December 2005, Rybka participated in the 15th
3027:
2720:Computer chess champ stripped of its four titles
2608:. Rybkaforum.net. Retrieved on October 12, 2013.
2577:. Rybkaforum.net. Retrieved on October 12, 2013.
2450:. Rybkaforum.net. Retrieved on October 12, 2013.
2438:. Rybkaforum.net. Retrieved on October 12, 2013.
2419:. Rybkaforum.net. Retrieved on October 12, 2013.
2400:. Rybkaforum.net. Retrieved on October 12, 2013.
2316:. Rybkaforum.net. Retrieved on October 12, 2013.
2235:. Rybkachess.com. Retrieved on October 12, 2013.
2186:. Rybkaforum.net. Retrieved on October 12, 2013.
2129:. Rybkaforum.net. Retrieved on October 12, 2013.
2117:. Rybkaforum.net. Retrieved on October 12, 2013.
1955:. Open-aurec.com. Retrieved on October 12, 2013.
1943:. Open-aurec.com. Retrieved on October 12, 2013.
1842:. Rybkaforum.net. Retrieved on October 12, 2013.
1785:. Rybkaforum.net. Retrieved on October 12, 2013.
1687:"Rybka controversy - FIDE complaint and verdict"
1056:, Rybka 3 has extra features when run under the
2832:"A Critical Analysis Of The Four Parts Of Riis"
2477:. TalkChess.com. Retrieved on October 12, 2013.
2891:"Report Case n. 2/2012 FIDE Ethics Commission"
2336:
2334:
2108:Rybka vs Dzindzichashvili – information center
1284:have been brought forward by chess programmer
2829:
2709:. Chess Vibes. Retrieved on October 12, 2013.
2374:
2352:
2295:Rybka Aquarium: Interview with the Developers
2283:"A 'Little Fish' (Rybka) in Corporate Waters"
2212:"Zappa (Computer) vs Rybka (Computer) (2007)"
539:
2764:"Example Computer Chess Forum disagreements"
2659:. ChessVibes. Retrieved on October 12, 2013.
2627:. ChessVibes. Retrieved on October 12, 2013.
767:
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2780:
2331:
1630:
1403:CSVN events "under the current direction".
2326:Rybka Cluster – for the elite chess player
1383:Rejection of the ICGA decision by the CSVN
1172:. Please do not remove this message until
546:
532:
34:
1276:Rybka has been accused of being based on
1192:Learn how and when to remove this message
3021:Interview with Rybka Opening Book Author
2346:
2127:Rybka vs Ehlvest II – information center
2084:
1678:
1168:Relevant discussion may be found on the
808:
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2823:
2462:. playwitharena.com (February 20, 2009)
2064:"7th World Computer Chess Championship"
1921:"Swiss System Season 3 Top 200 results"
1733:"Fritz 16 - your companion and trainer"
1421:
1392:abide by their sanctions against Rybka.
1371:against which were located at the end.
1216:In May 2007, a new chess engine called
714:– the latter is one of the world's top
3028:
2857:"Reader Feedback on ChessBase Article"
2678:. None. Retrieved on October 12, 2013.
2233:An Open Letter and $ 100,000 challenge
1719:"Come and get it – Fritz 15 released!"
1248:
1211:
878:Dutch open computer chess championship
855:Dutch open computer chess championship
2030:"Rybka Open Nederlands Kampioen 2008"
1814:Rybka Chess Community Forum July 2007
1795:Rybka Chess Community Forum July 2007
622:
208:Efficiently updatable neural networks
137:This article is part of the series on
2800:
2774:
2563:Official statement on [Deleted]?
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1289:regarding Rybka and GPL violations.
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2718:Courchane, Claire. (June 30, 2011)
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1313:two other chess software programs:
13:
2837:. harveywilliamson.com. p. 16
2811:. harveywilliamson.com. p. 10
2139:The Milov vs. Rybka Handicap Match
1876:
1517:Swedish Chess Computer Association
1272:Fruit GPL chess engine controversy
585:World Computer Chess Championships
14:
3057:
3046:Windows-only proprietary software
2955:
2830:Watkins, Mark (January 9, 2012).
2375:Watkins, Mark (January 3, 2012).
1328:World Computer Chess Championship
1301:WCCC disqualification and banning
1113:of rentals are strictly private.
904:World Computer Chess Championship
885:World Computer Chess Championship
874:World Computer Chess Championship
839:World Computer Chess Championship
583:After Rybka won four consecutive
2540:. Chessvibes.com. Archived from
2353:Watkins, Mark (April 18, 2011).
1147:
925:Odds matches versus grandmasters
729:
213:Handcrafted evaluation functions
149:
2941:
2930:
2918:
2904:
2883:
2863:
2849:
2807:Levy, David (January 9, 2012).
2781:Riis, Søren (January 5, 2012).
2756:
2744:
2725:
2712:
2693:
2681:
2662:
2643:
2630:
2611:
2599:
2580:
2575:Is Rybka a derivative of Fruit?
2568:
2556:
2530:
2527:. talkchess.com (March 6, 2006)
2518:
2506:
2480:
2453:
2441:
2429:osipovs arguments about strelka
2422:
2403:
2391:
2319:
2300:
2288:
2276:
2238:
2226:
2204:
2170:
2148:
2132:
2120:
2101:
2085:van Reem, Eric (May 31, 2010).
2078:
2056:
2044:
2022:
2000:
1970:
1958:
1946:
1934:
1913:
1892:
1870:
1853:"Rybka - Chessprogramming wiki"
1845:
1826:
1807:
1788:
1769:
1743:
1725:
1711:
1697:
1657:
1489:. July 11, 2010. Archived from
1355:Queen Mary University of London
1139:Crafty chess engine controversy
1108:Vasik Rajlich has now released
1103:
3000:The IPON Ponder ON rating list
2285:. chessvine.com. July 19, 2008
1603:
1576:
1553:
1531:
1505:
1487:Chess Engines Grand Tournament
1475:
1459:. July 3, 2010. Archived from
1449:
1134:Allegations of derivative work
1116:
1072:(formerly known as Convekta).
982:
65:4.1 / March 5, 2011
1:
1965:AEGT and Infinite Loop Series
1641:. Chess Vibes. Archived from
1409:
845:, finished second, tied with
3014:player profile and games at
2669:ICGA Investigation Documents
2398:Strelka 1.0 x32:Rybka clone?
2297:. chessok.com. July 23, 2008
2087:"Rybka wins ICT10 in Leiden"
2032:. Csvn.nl. November 16, 2008
1624:10.1016/j.entcom.2013.10.002
1597:10.1016/j.entcom.2014.04.004
1124:
1075:
1039:
646:
7:
2788:. ChessBase.com. p. 31
2606:Rybka Chess Community Forum
2434:September 16, 2009, at the
2415:September 16, 2009, at the
2008:"Computerschaak – ONK 2007"
1838:September 16, 2009, at the
1833:Rybka @ Amsterdam 15th WCCC
1819:September 16, 2009, at the
1800:September 16, 2009, at the
1781:September 16, 2009, at the
1337:
1174:conditions to do so are met
1034:
991:defeated Rybka in a match,
950:match without material odds
228:Stochastic gradient descent
10:
3062:
2377:"Review of the Rybka case"
2355:"Rybka-Crafty Evidence II"
2182:December 16, 2008, at the
1705:"ChessBase-ICGA interview"
955:December 16, 2008, at the
721:
278:Principal variation search
18:
2737:October 14, 2013, at the
1427:"Rybka 4.1 Release Notes"
1309:in programming Rybka had
899:, scoring a perfect 9/9.
768:Tournament participations
574:chess engine rating lists
118:
108:
96:
84:
80:
58:
54:
42:
33:
2937:Programmer's Open Letter
2623:August 15, 2011, at the
2592:August 11, 2011, at the
1857:www.chessprogramming.org
1457:"CCRL 40/40 – Pure list"
710:were the authors of its
2705:March 30, 2014, at the
2262:"Rybka 3 Release Notes"
2113:April 13, 2023, at the
2066:. Grappa.univ-lille3.fr
1900:"Chess War V D Results"
1612:Entertainment Computing
1585:Entertainment Computing
1068:, has been released by
914:, with a score of 8/9.
682:Iweta and Vasik Rajlich
673:
612:
288:Monte Carlo tree search
3005:June 12, 2011, at the
2993:March 1, 2012, at the
2898:FIDE Ethics Commission
2876:March 4, 2016, at the
2871:Complaint against ICGA
2674:March 3, 2016, at the
2312:June 10, 2010, at the
2200:Zappa fillets the Fish
2051:CCT11 Final Scoreboard
1565:June 12, 2011, at the
1513:"The SSDF Rating List"
1400:
1394:
1025:opposite-color bishops
940:in March 2007 with GM
931:Roman Dzindzichashvili
814:
683:
597:FIDE Ethics Commission
398:Dragon by Komodo Chess
223:Reinforcement learning
67:; 13 years ago
21:Rybka (disambiguation)
2976:July 5, 2008, at the
2655:July 6, 2011, at the
1395:
1389:
872:. Rybka won the 15th
812:
702:(who used to work on
681:
243:Unsupervised learning
161:Board representations
2988:The CEGT rating list
2983:The CCRL rating list
2618:Attack of the clones
2494:on November 12, 2011
2145:, September 24, 2008
1739:. November 12, 2017.
1721:. November 25, 2015.
1707:. February 10, 2012.
1541:. September 22, 2009
1463:on February 17, 2012
1368:University of Sydney
1360:conflict of interest
639:, and in many other
567:International Master
193:Deep neural networks
186:Evaluation functions
2914:. January 13, 2012.
2859:. January 13, 2012.
2410:Strelka = Rybka 1.0
1249:IPPOLIT controversy
1212:Strelka controversy
1161:of this section is
1052:. Although still a
987:In September 2007,
938:won an 8 game match
233:Supervised learning
218:Piece-square tables
30:
2246:A Lost Opportunity
1295:Jaap van den Herik
961:endgame tablebases
815:
741:. You can help by
684:
273:Alpha-beta pruning
28:
2768:ComputerChessClub
2538:"ChessVibes News"
1776:rybka source code
1645:on March 30, 2014
1425:(March 5, 2011).
1349:In January 2012,
1258:Decembrist revolt
1202:
1201:
1194:
936:Whilst Rybka has
759:
758:
556:
555:
283:Quiescence search
262:search algorithms
143:Chess programming
132:
131:
3053:
2967:
2966:
2964:Official website
2950:
2945:
2939:
2934:
2928:
2925:Rybka en de ICGA
2922:
2916:
2915:
2908:
2902:
2901:
2895:
2887:
2881:
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2860:
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2560:
2554:
2553:
2551:
2549:
2534:
2528:
2522:
2516:
2515:. chesslogik.com
2510:
2504:
2503:
2501:
2499:
2488:"IPPOLIT – home"
2484:
2478:
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2269:
2264:. August 6, 2008
2258:
2249:
2248:. chessninja.com
2242:
2236:
2230:
2224:
2223:
2221:
2219:
2214:. Chessgames.com
2208:
2202:
2198:Cozzie, Anthony
2196:
2187:
2174:
2168:
2167:
2165:
2163:
2158:. Chessgames.com
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2019:
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2015:
2004:
1998:
1997:
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1993:
1984:. Archived from
1974:
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1910:
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1877:Richey, Volker.
1874:
1868:
1867:
1865:
1863:
1849:
1843:
1830:
1824:
1823:. rybkaforum.net
1811:
1805:
1804:. rybkaforum.net
1792:
1786:
1773:
1767:
1766:
1764:
1762:
1757:on March 5, 2011
1747:
1741:
1740:
1729:
1723:
1722:
1715:
1709:
1708:
1701:
1695:
1694:
1693:on May 18, 2015.
1689:. Archived from
1682:
1676:
1675:
1669:
1661:
1655:
1654:
1652:
1650:
1637:Doggers, Peter.
1634:
1628:
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1519:. March 21, 2010
1509:
1503:
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1500:
1498:
1493:on March 8, 2011
1479:
1473:
1472:
1470:
1468:
1453:
1447:
1446:
1444:
1442:
1437:on March 5, 2012
1433:. Archived from
1419:
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641:Slavic languages
626:
624:[ˈrɪpka]
548:
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453:Leela Chess Zero
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86:Operating system
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2995:Wayback Machine
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2604:
2600:
2594:Wayback Machine
2585:
2581:
2573:
2569:
2561:
2557:
2547:
2545:
2544:on May 28, 2010
2536:
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2001:
1991:
1989:
1988:on May 12, 2021
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1812:
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1802:Wayback Machine
1793:
1789:
1783:Wayback Machine
1774:
1770:
1760:
1758:
1751:"Vasik Rajlich"
1749:
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957:Wayback Machine
927:
880:, scoring 8/9.
770:
755:
749:
746:
739:needs expansion
724:
716:freestyle chess
676:
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552:
523:
522:
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301:Chess computers
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3018:
3016:Chessgames.com
3009:
2997:
2985:
2980:
2971:Official Forum
2968:
2957:
2956:External links
2954:
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2307:Rybka 4 update
2299:
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2250:
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2100:
2077:
2055:
2053:. cctchess.com
2043:
2021:
1999:
1969:
1957:
1945:
1933:
1912:
1891:
1879:"CCT6 Results"
1869:
1844:
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1768:
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1710:
1696:
1685:Schröder, Ed.
1677:
1656:
1629:
1618:(3): 159–171.
1602:
1591:(3): 189–204.
1575:
1552:
1530:
1504:
1474:
1448:
1431:Rybkaforum.net
1423:Rajlich, Vasik
1413:
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1110:"Remote Rybka"
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1038:
1036:
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837:. At the 14th
833:, Gandalf and
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656:representation
648:
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578:computer chess
561:is a computer
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2640:. ticc.uvt.nl
2639:
2636:Levy, David.
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2460:News-Overview
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1992:February 13,
1990:. Retrieved
1986:the original
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1926:February 22,
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1491:the original
1483:"CEGT 40/20"
1477:
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1461:the original
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1182:January 2020
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1107:
1104:Remote Rybka
1080:
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1021:50-move rule
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942:Jaan Ehlvest
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743:adding to it
738:
712:opening book
708:Dagh Nielsen
685:
658:, and is an
650:
632:
618:
616:
601:
582:
565:designed by
563:chess engine
558:
557:
482:
333:Deep Thought
313:ChessMachine
238:Texel tuning
197:Transformers
103:Chess engine
44:Developer(s)
25:
16:Chess engine
2448:Strelka 2.0
2379:. p. 7
2089:. ChessBase
1982:old.csvn.nl
1862:October 31,
1573:Rating list
1332:prize money
1311:plagiarized
1286:Zach Wegner
1224:Yuri Osipov
1117:Version 4.1
983:Zappa match
972:Vadim Milov
633:little fish
388:CuckooChess
378:Chess Tiger
114:Proprietary
3030:Categories
2841:January 9,
2815:January 9,
2792:January 5,
2587:Evaluation
2548:January 2,
2498:January 2,
2218:January 2,
2162:January 2,
2070:January 2,
2036:January 2,
2014:January 2,
1761:January 2,
1737:Chess News
1410:References
1364:David Levy
1266:decompiled
1159:neutrality
1054:UCI engine
976:Elo rating
921:with 8/9.
906:, held in
887:, held in
660:alpha-beta
635:in Czech,
458:MChess Pro
393:Deep Fritz
323:Cray Blitz
124:rybkachess
72:2011-03-05
2360:April 13,
2268:August 7,
2143:Chessbase
2010:. Csvn.nl
1569:; Ponder
1545:April 27,
1441:March 27,
1351:ChessBase
1242:program.
1170:talk page
1125:Version 5
1076:Version 4
1058:ChessBase
1046:Chessbase
1040:Version 3
823:Freestyle
750:June 2008
647:Internals
617:The word
603:ChessBase
513:Turochamp
503:Stockfish
498:SmarThink
443:KnightCap
418:GNU Chess
403:Fairy-Max
373:AlphaZero
328:Deep Blue
203:Attention
173:Bitboards
3003:Archived
2991:Archived
2974:Archived
2948:ICT 2012
2874:Archived
2735:Archived
2703:Archived
2672:Archived
2653:Archived
2621:Archived
2590:Archived
2513:FireBird
2432:Archived
2413:Archived
2310:Archived
2180:Archived
2111:Archived
1836:Archived
1817:Archived
1798:Archived
1779:Archived
1649:June 29,
1563:Archived
1523:July 12,
1497:July 12,
1467:July 12,
1338:Response
1236:pen name
1163:disputed
1066:Aquarium
1050:Convekta
1035:Versions
953:Archived
908:Pamplona
849:, after
847:Shredder
835:Shredder
800:Shredder
653:bitboard
631:, means
591:and the
488:Shredder
348:Mephisto
318:ChipTest
2093:May 31,
1254:IPPOLIT
1219:Strelka
1081:Rybka 4
1070:ChessOK
1014:⁄
1000:⁄
889:Beijing
843:Rajlich
722:History
463:Mittens
428:Houdini
268:Minimax
119:Website
110:License
91:Windows
70: (
2880:(2012)
2869:FIDE:
1315:Crafty
1206:Crafty
919:Leiden
897:Leiden
870:HIARCS
851:Junior
706:) and
637:Polish
589:Crafty
468:MuZero
448:Komodo
438:Junior
433:Ikarus
423:HIARCS
383:Crafty
353:Saitek
338:HiTech
3012:Rybka
2894:(PDF)
2835:(PDF)
2786:(PDF)
1668:(PDF)
1319:Fruit
1278:Fruit
1228:Fruit
989:Zappa
965:draws
912:Spain
893:China
866:Zappa
831:Sjeng
827:Hydra
804:Fruit
796:Spike
792:Zappa
704:Rebel
629:Czech
619:rybka
607:Fritz
593:Fruit
559:Rybka
518:Zappa
508:Torch
493:Sjeng
483:Rybka
478:REBEL
413:Fruit
408:Fritz
343:Hydra
308:Belle
256:Graph
29:Rybka
2843:2012
2817:2012
2794:2012
2550:2011
2500:2011
2385:2012
2362:2020
2270:2008
2220:2015
2164:2011
2095:2010
2072:2011
2038:2011
2016:2011
1994:2019
1928:2011
1907:2011
1886:2011
1864:2022
1763:2011
1672:FIDE
1651:2011
1560:IPON
1547:2010
1525:2010
1499:2010
1469:2010
1443:2014
1376:FIDE
1366:and
1317:and
1156:The
1048:and
868:and
819:CCT8
802:and
674:Team
613:Name
473:Naum
260:tree
258:and
168:0x88
126:.com
98:Type
1620:doi
1593:doi
1282:GPL
1062:GUI
817:On
745:.
627:in
3032::
2896:.
2766:.
2467:^
2333:^
2253:^
2191:^
2141:,
1980:.
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1571:ON
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23:.
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