This site may earn affiliate commissions from the links on this page. Rybka, the best chess-playing computer program in the world and the winner of the last four World Computer Chess Championships (WCCC), has been disqualified and banned for the plagiarizing of two other chess engines, Crafty and Fruit. In a damning missive, the president of the International Computer Games Association (ICGA), the governing body behind the WCCC, describes how the author of Rybka, “unfairly” cheated his way to four victories by ripping off the work of other chess masters. The ICGA is demanding the return of both the trophies and the prize money, and has revised the standings of the last five championships to reflect Rybka’s excommunication. Not since to beat Garry Kasparov in 1997 has the world of computer chess been so uproarious!
The ICGA’s entire case seems to hinge on, an open source chess engine that was the runner-up at WCCC 2005. Rybka debuted the year after, and from the get-go experts were claiming that Rybka evaluated moves in an identical fashion to Fruit. Curiously, ICGA isn’t even disqualifying Rybka because it copies Fruit — rather, it’s simply upset that Rajlich claims his engine is original, and refuses to give credit where it’s due. To come to this rather epic and libelous conclusion, the ICGA assembled a 34-person panel of programmers who have competed in past championships to analyze Rybka. Unfortunately, Rybka’s source code has never been available, so reverse engineering and straight-up move-evaluation comparison was used to analyze the originality of Rajlich’s chess engine. The panel unanimously agreed that newer versions of Rybka are based on — and worse, that the early beta versions were based on, another open-source chess engine. Rajlich has always claimed that Rybka is original — even when confronted with the findings of the report by the president of the ICGA.
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Vasik Rajlich, incidentally, is an international master himself, and a graduate of MIT. Spectrum has a as both a brilliant chess player and an engineer — and it leaves you wondering if Rybka’s disqualification is actually kosher, or merely the result of a witch hunt. After all, with Rajlich not making his source code available, it’s almost impossible for the ICGA to be sure that he ripped off Crafty and Fruit — but at the same time, it’s easy to see the allure of the open-source, world championship runner-up Fruit.
If Rajlich did plagiarize Crafty and Fruit, the reasons are probably financial: Rybka is, and its accolade as the best chess program in the world must surely bring in a few dollars. It’s a tricky situation, though: with Rybka now outlawed from the WCCC, and with the ICGA asking other tournaments to block its entry, the only real way Rajlich and the rest of the Rybka team can clear their names is to show their source code — a financially untenable move. In short, Rybka is stuck between a rock and a hard place. Read more at or download Image credit:.
Arena 3.5 Arena 3.5 is available since 2014-01-01 (17 MB): Arena 3.5 with engines SOS 5.1, AnMon 5.75, Hermann 2.8, Ruffian 1.05, Rybka 2.3.2a free, Spike 1.4, book Perfect2010 by Sedat Canbas, mini book Titus 2.4 (by Kevin Frayer), mini book Olympiad, PGN database from Olivier DEVILLE, EloStat 1.3, Gaviota 3-men tablebases, Speedtest 1.0.2, flags, fonts, graphics, help files, without setup program. (16 MB): Arena 3.5 setup includes everything from the ZIP plus engines Nejmet 3.07 and Dragon 4.6 plus move announcements. Most important changes compared to last public version 3.0: PGN:. Filter (=Search) positions in PGN. PGN lists faster sorting.
PGN loads faster. Rare PGN loading errors fixed.
![Engine Engine](http://chessok.com/wp-content/uploads/2008/12/5.png)
'PGN-New' command handled correctly: 'Select new PGN file'-dialogue, then you can paste PGNs from Clipboard into empty file. Filter Game Data: Progress bar updated during filtering. You can now filter games with date ranges. 'Filter games with some fields did not work'- bug removed.
Useless '?' -s removed in PGN list. PGN and EPD lists can be always on top (click on the icon in the top left corner to see the system menu of the window). Arena now remembers column width of PGN and EPD lists. Arena reads short comments (!? Etc) from PGNs, also in PGN book import Engines:. Common max.