Home * Engines * Ippolit

an open source engine with unclear legal status by pseudonymous authors. A former Chess Programming Wiki page of Ippolit by one of its authors from May 2009, was preliminary deleted due to a claim by Rybka author Vasik Rajlich, CPW would support piracy sites and who implied Ippolit is a clone or derivative from Rybka 3 [1] , apparently due to disassembling and decompiling.
Hippolyta the Amazonian queen [2]

Legal Status

The authors of Ippolit call themselves Comrades and keep pseudonymous. Head Comrade is Yakov Petrovich Golyadkin [3], Deputy Head Comrade Igor Igorovich Igoronov, Honorary Comrade Vladimir Ilyich Lenin [4], and further Roberto Pescatore, Yusuf Ralf Weisskopf, Ivan Skavinsky Skavar [5], and Decembrists [6] [7] [8] [9].

Ippolit pages are hosted by Wikispaces.org [10]. Ippolit and its successor RobboLito [11] were discussed in Computer Chess Forums from mid October 2009 [12] [13], and it is no longer appropriate to ignore them further. The source code is open and distributed. Ippolit and RobboLito are apparently as strong or even stronger than Rybka 3 on a single processor. They are therefor likely to hurt interests of commercial chess program authors and companies as well as hobbyist computer chess programmers with all their original efforts over years, and finally the sportive aspects of computer chess, the competition.

The legal status of Ippolit and its successors, and despite the socialization of re-engineered knowledge from commercial engines should be matter of independent scientific research probably under the aegis of the ICGA [14].


In June 2010, Vasik Rajlich made following statement on Rybka and Ippolit, which was published by Sven Schüle in CCC [15]:
Ippolit is disassembled Rybka 3 with changes. The changes are considerable but not even close to enough to leave any doubt. Robbolito is an evolved Ippolit, with more changes and more cleanup. I haven't checked the other new engines yet.

The same day Zach Wegner published a technical summary by former anonymous author "BB+" alias Mark Watkins about Rybka and Ippolit [16], which demonstrates differences are substantial [17], and he nevertheless concluded he would find it wholly plausible that Ippolit is a "reverse-engineered Rybka with many changes" in the same forum thread. RobboLito's sentinel [18] Milos Stanisavljevic [19] [20] is proponent of Ippolit's originality, despite his note it used ideas from reverse engineering Rybka 3 [21].


See also


Forum Posts





External Links





  1. ^ private communication with Gerd Isenberg
  2. ^ Hippolyte from Wikipedia, image from Promptuarii iconum insigniorum by Guillaume Rouillé
  3. ^ The Double: A Petersburg Poem a novella written by Fyodor Dostoyevsky
  4. ^ Vladimir Lenin from Wikipedia
  5. ^ Abdul Abulbul Amir from Wikipedia
  6. ^ IPPOLIT - Comrades
  7. ^ IPPOLIT from Wikipedia
  8. ^ Decembrist revolt from Wikipedia
  9. ^ ChessLogik - RobboLito hosted by Norman Schmidt has a list of RobboLito comrades and Decembrists
  10. ^ IPPOLIT - home
  11. ^ ChessLogik - RobboLito hosted by Norman Schmidt has a list of RobboLito comrades and Decembrists
  12. ^ New engine: Ippolit by Vladimir Medvedev, CCC, October 18, 2009
  13. ^ Official statement on [Deleted]? by Vasik Rajlich, Rybka Forum, October 21, 2009
  14. ^ Attack of the clones | ChessVibes by David Levy, 19 February, 2011
  15. ^ My recent correspondence with Vasik Rajlich by Sven Schüle, CCC, June 13, 2010
  16. ^ A comparison of Rybka and IPPOLIT (pdf)
  17. ^ BB's Rybka/Ippolit comparison by Zach Wegner, OpenChess Forum, June 13, 2010
  18. ^ ChessLogik - RobboLito hosted by Norman Schmidt
  19. ^ Firebird programmers no longer anonymous? by oudheusa, Rybka Forum, February 07, 2010
  20. ^ Re: Is Houdini 2 Legally Copyrighted? by Jeremy Bernstein, OpenChess Forum, December 10, 2011
  21. ^ Re: WCCC 2011 - Junior is the 2011 World Champion by Milos Stanisavljevic, CCC, November 25, 2011
  22. ^ BorisChess - Understanding of Ippolit

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