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Rybka (Computer)
Number of games in database: 215
Years covered: 2005 to 2016
Overall record: +142 -32 =41 (75.6%)*
   * Overall winning percentage = (wins+draws/2) / total games.

Repertoire Explorer
Most played openings
B90 Sicilian, Najdorf (9 games)
C42 Petrov Defense (7 games)
D47 Queen's Gambit Declined Semi-Slav (5 games)
B28 Sicilian, O'Kelly Variation (5 games)
000 Chess variants (5 games)
D43 Queen's Gambit Declined Semi-Slav (5 games)
B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack (4 games)
C92 Ruy Lopez, Closed (4 games)
C78 Ruy Lopez (4 games)
B40 Sicilian (3 games)

   🏆 TCEC Season 9 (stage 1a)
   Fizbo vs Rybka (May-20-16) 0-1
   Rybka vs Gull (May-19-16) 1-0
   Ginkgo vs Rybka (May-17-16) 1/2-1/2
   Rybka vs Texel (May-17-16) 1-0
   Rybka vs Laser 11 (May-14-16) 1-0

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(born 2004) Czech Republic

[what is this?]

Rybka (Czech for "little fish") is a computer chess engine designed by IM Vasik G Rajlich. It supports both single processor and SMP systems. Iweta Radziewicz Rajlich is the main tester & Hans van der Zijden is one of her operators. Jeroen Noomen & Jiri Dufek co-authored her opening book. At the WCCC (2006), Rybka, playing under the name Rajlich, tied for 2nd place with Shredder (Computer), and behind the champion, Junior (Computer). Rybka won the 15th World Computer Chess Championship in Amsterdam, 2007 and the 16th World Computer Chess Championship in Beijing, September 28th to October 5th 2008 with 8.0/9 (+7 -0 =2). During 2009-10, she also became the World Computer Speed Chess Champion.

In 2011, the International Computer Games Association (ICGA) ruled that Raljich had plagiarized two other programs, Crafty and Fruit, disqualified him for life from competing in the World Computer Chess Championship and all other ICGA events, and stripped Rybka of the championship titles it had won in 2006 through 2010.

Wikipedia article: Rybka

Last updated: 2018-12-03 07:14:11

 page 1 of 9; games 1-25 of 215  PGN Download
Game  ResultMoves YearEvent/LocaleOpening
1. Spike vs Rybka 1-069200515. IPCCCE39 Nimzo-Indian, Classical, Pirc Variation
2. Rybka vs Jonny 1-0212005Blitz:110'C69 Ruy Lopez, Exchange, Gligoric Variation
3. Zappa vs Rybka 0-1772005IPCCCE12 Queen's Indian
4. Rybka vs Shredder ½-½572005IPCCCB81 Sicilian, Scheveningen, Keres Attack
5. Rybka vs Argonaut 1-0372005IPCCCC68 Ruy Lopez, Exchange
6. Rybka vs Gandalf 1-0462005?B12 Caro-Kann Defense
7. Ikarus vs Rybka 0-1572005IPCCCB00 Uncommon King's Pawn Opening
8. Ktulu vs Rybka  0-1502006Sonnabend_Div.Hardware_30minD43 Queen's Gambit Declined Semi-Slav
9. Shredder vs Rybka 0-1412006WBEC13 Premier Division,C50 Giuoco Piano
10. Rybka vs Granda Zuniga 1-0472006Torre ENTEL PCSB18 Caro-Kann, Classical
11. Rybka vs M Flores 1-0252006Copa EntelE10 Queen's Pawn Game
12. R Leitao vs Rybka ½-½432006Torre ENTEL PCSD37 Queen's Gambit Declined
13. Rybka vs E Arancibia  1-0472006Copa EntelB07 Pirc
14. J Hellsten vs Rybka 0-1642006Torre ENTEL PCSD36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2
15. O Zambrana vs Rybka  0-1342006Copa EntelB41 Sicilian, Kan
16. Rybka vs E Cordova  ½-½742006Copa EntelB25 Sicilian, Closed
17. R Felgaer vs Rybka  0-1382006Copa EntelB51 Sicilian, Canal-Sokolsky (Rossolimo) Attack
18. J Alvarez Nunez vs Rybka  0-1442006Copa EntelC85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD)
19. Rybka vs L Rojas Keim  1-0522006Copa EntelD90 Grunfeld
20. Zor Champ vs Rybka 1-0872006CSS/Pal Freestyle Tourney Final (45+5)B92 Sicilian, Najdorf, Opocensky Variation
21. Ant vs Rybka 0-13420066th International CSVN TournamentA58 Benko Gambit
22. Rybka vs Deep Gandalf 1-05720066th International CSVN TournamentC42 Petrov Defense
23. Argonaut vs Rybka 0-14220066th International CSVN TournamentB50 Sicilian
24. Rybka vs Shredder ½-½6720066th International CSVN TournamentA14 English
25. Rybka vs Deep Sjeng 1-05720066th International CSVN TournamentB80 Sicilian, Scheveningen
 page 1 of 9; games 1-25 of 215  PGN Download
  REFINE SEARCH:   White wins (1-0) | Black wins (0-1) | Draws (1/2-1/2) | Rybka wins | Rybka loses  

Kibitzer's Corner
< Earlier Kibitzing  · PAGE 79 OF 79 ·  Later Kibitzing>
Jan-21-12  polarmis: <Not just one programmer...the Computer Chess Association of the Netherlands agree with him.>

Ed Schroeder is from the Netherlands, which I guess isn't an unrelated factor.

<If the ICGA cannot take the trouble to even confer with a national organisation - then it suggests to me that little effort has been made to achieve a broad consensus.>

Again, their decision was taken after the verdict was announced, so obviously couldn't have affected the verdict.

By the way, the more I read about Schroeder the more it just seems a purely emotional response. One of the key items in his decision to defend Rajlich was a single tabloid story published after the verdict was announced: Schroeder and various other Rajlich supporters jump to the obviously false conclusion that it must have been planted by the ICGA, when anyone familiar with the British tabloids would recognise the style instantly. Schroeder should be annoyed with them (and I agree, they're reprehensible), not the ICGA.

Here's the ICGA panel's report (a pdf file): http://chessprogramming.wikispaces....

Jan-26-12  timhortons: btw, i hope somebody answer my question.

why company like microsoft and ibm not interested develop a strong software like rybka or maybe a super more monster software more stronger than this?

why the corporate giants are not involve in development of this? why small guys like rajlich are into it?

Jan-26-12  Kinghunt: <why company like microsoft and ibm not interested develop a strong software like rybka or maybe a super more monster software more stronger than this?

why the corporate giants are not involve in development of this? why small guys like rajlich are into it?>

It's a small niche. Big corporations have no reason to focus on chess. They won't earn a lot from sales, and current programs are already well beyond the point of being able to fight against humans in publicity matches. There's simply nothing in computer chess for Microsoft or IBM.

Jan-26-12  timhortons: thanks king hunt, so thats the reason.

btw ubisoft at one point is involved in the development of chessmaster software. ubisoft is a fairly size multinational company from quebec involve in developing gaming software.

I never heard them making a more stronger chess master software lately, maybe its not worth their time, maybe the company decided to produce gaming software for ps3.

Jan-26-12  timhortons: sorry, its not maybe, reading from wike entry, their more on ps3 and xbox,<right, why spend precious time making chess software? for a company this big? its not worth their time.>


Brothers in Arms: Furious 4 (PlayStation 3, Xbox 360, Microsoft Windows) Far Cry 3 (PlayStation 3, Xbox 360, Microsoft Windows) I Am Alive (PlayStation 3, Xbox 360)
Tom Clancy's Ghost Recon: Future Soldier (Xbox 360, PlayStation 3, Microsoft Windows) Tom Clancy's Ghost Recon Online (Microsoft Windows, Wii U) Tom Clancy's Splinter Cell: Retribution (PlayStation 3, Xbox 360, Microsoft Windows) Prince of Persia 2: Prodigy (PlayStation 3, Xbox 360, Wii U)[33]

[edit] 2013
Tom Clancy's Rainbow Six: Patriots (Microsoft Windows, PlayStation 3, Xbox 360)[33]

[edit] TBA
Tom Clancy's EndWar 2 (TBA)
Beyond Good & Evil 2 (TBA)
Killer Freaks from Outer Space (Wii U)

Jan-26-12  benjinathan: When there is crazy strong chess software available for free, it is difficult to see why any company makes chess software anymore.
Premium Chessgames Member
  AylerKupp: <timhortons> I would think that the most likely answer is that they don't see it as a big money maker. And chess programs are not that large or complicated. For example, the latest Stockfish 2.2.2 consists of only 42 files and 8107 source lines of code (SLOC). A "small guy" can do it much more efficiently. To put in perspective, in 2001 Windows XP has been estimated (no accurate numbers apparently exist) to consist of 35-50 million (SLOC) and Windows 7 should be much larger, maybe 60 million. That's why you need corporate giants.

Of course, the number of <useful> SLOC in Windows 7 is much, much smaller. :-)

Premium Chessgames Member
  AylerKupp: I think that Vasik Rajlich better get that Rybka 5 out quickly. In the latest CCRL 40/40 rankings (Jan-29-12) Rybka 4.1 has dropped to #3 behind the new Stockfish 2.2.2. And Critter 1.2 is only 7 ELO points behind, with the newly released Critter 1.4 probably stronger. Single processor Komodo 4 is 40 ELO points behind Rybka 4.1 with a new SMP version coning out "soon". I wouldn't be surprised if within the next 2 months Rybka 4.1 has dropped to #5 in the CCRL 40/40 rankings.

Then again, since he likely won't be competing in any ICGA tournaments in the near future, he should have extra time in his hands.

Premium Chessgames Member
  perfidious: <DrMAL: <Everett:>....Although I am not sure such a cynical approach to using computers as a tool is usually the case. I can see how a lot of lower level players could just play out games with an engine on and, when the engine evaluates a move played as bad, go spouting off how dumb that player was and/or how smart they are because blah blah blah...pity. No doubt this site and others have plenty of such people, even worse it seems, there are people on here (and elsewhere) who go around with some attitude of trying to put down others, especially those higher level than them who kibitz....>

While you and I have had our differences-strong ones, I might add-can't agree more with you on this.

There are, fortunately, enough posters such as <Everett> who are open to ideas which involve more effort than simply sitting before the silicon monstrosity and letting it crunch out moves <ad infinitum>.

Jul-04-14  mrandersson: Long live rybka In its day it was such a good engine. I think most people will say rybka 3 was a gold point in computer chess it was quite ahead of the field at the time and even now its still a good engine to use.

Just most engines now iv found are quite anti rybka and know how it plays and what its problems are etc.

Premium Chessgames Member
  Everett: <perfidious> dr. Mal was ones of the losers on this site who would judge an entire game on how well it matched up with best computer play. His response to my post, years ago at this point, is more crap out of the toilet.

Don't miss him, though he remains on ignore just in case.

Mar-13-15  Conrad93: <Long live rybka In its day it was such a good engine. I think most people will say rybka 3 was a gold point in computer chess it was quite ahead of the field at the time and even now its still a good engine to use.>

I don't care about the rating hype. I use Rybka 4 far more than any other engine. I think Stockfish 5 is less dynamic, and when I paired the two against one another in a match, Rybka won almost every game.

Mar-13-15  N0B0DY: You think?
Mar-13-15  Conrad93: Will they ever release Rybka 5?
Mar-13-15  N0B0DY: Not on my watch.
Mar-14-15  offramp: Humans helping computers to cheat at chess.
Mar-14-15  Kinghunt: <I use Rybka 4 far more than any other engine. I think Stockfish 5 is less dynamic, and when I paired the two against one another in a match, Rybka won almost every game.>

That is exceedingly strange. On the CCRL rating list tests, Stockfish 6 defeated Rybka 4 62-16. Stockfish 5 had a slightly less lopsided score of 77-40 against Rybka 4. The rating lists exist for a reason - Stockfish is simply a class above Rybka.

Mar-14-15  Conrad93: It could just be my hardware. I'm sure they use far more powerful computers for computer tournaments.
Mar-14-15  Kinghunt: Whatever hardware they were using, Rybka and Stockfish were running on equal hardware. The only way Rybka could consistently beat Stockfish in your tests is if you're giving unequal time or computational resources (aka, running 1 core vs 4 cores).
Mar-14-15  mrandersson: To be fair rybka has been sat in the dark now since at least 2010. Note stockfish gets more updates and has a army size force working around the clock.

In truth what ever engine you use for your own games you are going to find help and ideas on were you went wrong or better is lines.

Even my old shredder still gives me help and look what happened to that engine.

Premium Chessgames Member
  moronovich: <offramp: Humans helping computers to cheat at chess.>

Lol !

Mar-15-15  Conrad93: Why does Stockfish 5 go from 0.88- to 0.00, to even 0.60 in this position in a span of only one move?

click for larger view

If I don't capture the pawn, it says black has a slight advantage, but the minute I capture it, the evulation changes from 0.12- to 0.47 .

I just don't get it.

Then it recommends playing 8. Be3, and a few moves later black has a lost position.

Mar-15-15  Conrad93: The move order is 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Qb6 5. Nf3 Nc6 6. Be2 Nh6 7. Bxh6!?
Nov-17-15  NeverAgain: Conrad93: you need to specify exact moves/lines and evals for that position, otherwise it's not clear what the problem is. You say "if I don't capture the pawn" - what pawn? It's Black's turn and he must take the h6 bishop.

Oh yeah, and Rybka 5 is coming in December. Except it will be called Fritz 15.

Feb-20-21  Tadeusz Nida: <yo... PROGRAMMER WANTED!!!


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