Members · Prefs · Laboratory · Collections · Openings · Endgames · Sacrifices · History · Search Kibitzing · Kibitzer's Café · Chessforums · Tournament Index · Players · Kibitzing

Rybka (Computer)
Number of games in database: 213
Years covered: 2005 to 2016
Overall record: +141 -31 =41 (75.8%)*
   * Overall winning percentage = (wins+draws/2) / total games.

Repertoire Explorer
Most played openings
B90 Sicilian, Najdorf (9 games)
C42 Petrov Defense (7 games)
B28 Sicilian, O'Kelly Variation (5 games)
D43 Queen's Gambit Declined Semi-Slav (5 games)
000 Chess variants (5 games)
C78 Ruy Lopez (4 games)
B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack (4 games)
D47 Queen's Gambit Declined Semi-Slav (4 games)
C92 Ruy Lopez, Closed (4 games)
B92 Sicilian, Najdorf, Opocensky Variation (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
   Hannibal vs Rybka (May-14-16) 0-1

Search Sacrifice Explorer for Rybka (Computer)
Search Google for Rybka (Computer)

(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 (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.

 page 1 of 9; games 1-25 of 213  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. Rybka vs Shredder ½-½572005IPCCCB81 Sicilian, Scheveningen, Keres Attack
4. Zappa vs Rybka 0-1772005IPCCCE12 Queen's Indian
5. Rybka vs Gandalf 1-0462005?B12 Caro-Kann Defense
6. Rybka vs Argonaut 1-0372005IPCCCC68 Ruy Lopez, Exchange
7. Ikarus vs Rybka 0-1572005IPCCCB00 Uncommon King's Pawn Opening
8. Shredder vs Rybka 0-1412006WBEC13 Premier Division,C50 Giuoco Piano
9. Ktulu vs Rybka  0-1502006Sonnabend_Div.Hardware_30minD43 Queen's Gambit Declined Semi-Slav
10. Rybka vs Granda Zuniga 1-0472006Torre ENTEL PCSB18 Caro-Kann, Classical
11. Leitao vs Rybka ½-½432006Torre ENTEL PCSD37 Queen's Gambit Declined
12. Rybka vs M Flores 1-0252006Copa Entel ,E10 Queen's Pawn Game
13. Rybka vs E Arancibia  1-0472006Copa Entel ,B07 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 Entel ,B41 Sicilian, Kan
16. R Felgaer vs Rybka  0-1382006Copa Entel ,B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack
17. Rybka vs E Cordova  ½-½742006Copa Entel ,B25 Sicilian, Closed
18. J Alvarez Nunez vs Rybka  0-1442006Copa Entel ,C85 Ruy Lopez, Exchange Variation Doubly Deferred (DERLD)
19. Rybka vs L Rojas  1-0522006Copa Entel ,D90 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 Deep Sjeng 1-05720066th International CSVN TournamentB80 Sicilian, Scheveningen
25. IsiChess vs Rybka 0-13720066th International CSVN TournamentA57 Benko Gambit
 page 1 of 9; games 1-25 of 213  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 69 OF 79 ·  Later Kibitzing>
Apr-17-11  vonKrolock: <Rybka> was winning the match with a 3 points margin, then <Houdini> won three games and the match runs with the score evened after 22 games ... Live the 23th at
Premium Chessgames Member
  Xeroxx: This player is a computer cheater.
Premium Chessgames Member
  maxi: Care has to be taken in these computer events that they don't get a chance to consult a human.
Apr-17-11  vonKrolock: <Houdini> won the 23th game with black and now is leading with +1 - explanations!? <Rybka>, presumably, is not "tired" like Korchnoi vs Spassky in there 1977/78 candidates final...
Premium Chessgames Member
  Reggaalex: <Houdini 1.5a> is stronger and so I use <Rybka Aquarium 4> <<only with <Houdini>>> for analyses ^^. <The Rocket: "it's a tactical monster">. Long live Open Source.
Premium Chessgames Member
  Wyatt Gwyon: Anyone know when we might expect the Rybka-Houdini games on here?
Apr-18-11  vonKrolock: <Reggalex> Sure, even so the -3 start is puzzling.

<Wyatt Gwyon> When someone submit a game and staff aprove it.

... But is this not the ultimate clash between free (amateur !?) information and the 'pro' (official, protected) concept? ?!

Premium Chessgames Member
  Reggaalex: <vonKrolock> I agree, it's more than mysterious, but things have changed and Houdini is leading...till now. I think that this is the ultimate clash and it shows that free sciences are often more than expensive ones.
Apr-29-11  LIFE Master AJ:

Amateur beats Rybka 4.0 - - - BLINDFOLDED!!!

Premium Chessgames Member
  Colonel Mortimer: <LIFE Master AJ: Amateur beats Rybka 4.0 - - - BLINDFOLDED!!!>

Yeah - it's a hoax (just in case you needed that pointed out)

Apr-29-11  LIFE Master AJ: Actually - that was just a jab. (See my forum - I posted there first - for how I described this incident.)

I would no sooner believe that this chump could beat Rybka blindfolded ... you might as well tell me that all the individuals (on my ignore list) had banded together and bought me a Birthday present.

Or the sun went Super-Nova.

And if I continue - in this vein - then I should really move it to Odd Lie page.

Apr-29-11  LIFE Master AJ: On a serious note - can anyone here tell me how he managed such a feat???

Sure - he cheated. (That goes without saying.) But how?

I am - if nothing else - eternally curious. AND ... I know for certain that the "engine-heads" (no offense) are VERY smart guys ... if anyone can figure this mystery out ... they can!

Premium Chessgames Member
  anandrulez: 20,000 books - Pi to a million digits . Sure! Boy gimme a break . Just because we are readers doesn't men you can sell anything !
Apr-29-11  LIFE Master AJ: But ... ... ... and here is the million-dollar-question ...

IF he really did defeat Rybka, then how did he manage it? (Or was it some form of elaborate hoax?)

I remember a similar "PSYCHIC" trick. Something about spending a long amount of time inside a frozen block of ice. Some darn fool tried the exact same thing ... and died after only a few days.

Those things are NEVER for real.

Premium Chessgames Member
  polarmis: <LIFE Master AJ: On a serious note - can anyone here tell me how he managed such a feat???>

A chess player who was watching noted he mixed up b & d when calling out moves, so it sounded as though he was listening to the moves and misheard. A funny detail is that on move 13 he said he'd calculated everything to around move 30...

On the Pi digits & books - of course it's also nonsense, but ChessBase's analysis is flawed. He claims to be able to memorise a book in 15 minutes, not a whole day. And he never recited all the digits but would just be asked, e.g. for the 2,000,001st :) Presumably he'd claim to be able to memorise pages of digits in a second or two...

Premium Chessgames Member
  Jim Bartle: i'm totally convinced it's real. Who needs to see, you know, the moves of the game or anything like that?
Premium Chessgames Member
  Jim Bartle: Whoops, here are the alleged games:
Premium Chessgames Member
  alexmagnus: The official world record in Pi memorization is 50 000 digits; the inofficial, but a widely recognized one is 100 000.
Jun-04-11  kia0708: Elo ratings of the strongest chess engines:

1 Houdini 1.5a 3010
2 Deep Rybka 4 2955
3 Stockfish 2.01 JA 2910
4 Critter 0.90 SSE42 2888
5 Komodo64 1.3 JA 2830
6 Naum 4.2 2825
7 Deep Shredder 12 2800
8 Gull 1.1 2785
9 Deep Fritz 12 32b 2780
9 Deep Sjeng c't 2010 32b 2780
10 Protector 1.4.0 x64 2756
12 spark-1.0 SSE42 2750
13 HIARCS 13.2 MP 32b 2746
14 Zappa Mexico II 2706
15 Deep Onno 1-2-70 2682
16 Deep Junior 12 2680
17 Hannibal 1.0a 2679
18 Toga II 1.4 beta5c BB 2670
19 Umko 1.1 SSE42 2631
20 Loop 13.6/2007 2618
21 Jonny 4.00 32b 2605
22 Crafty

Housini, RYBKA and Stockifish are just amazing !

Jun-09-11  DrMAL: I used to regularly wail on Northwestern University's chess program in 1979 (yes I am a geezer) then the computer WC until 1980. Its rating was supposedly around 2080 on its big CDC Cyber mainframe but its play often resembled a chimp more than a champ.

I drew Rybka 4.1 once, so what if it was during a power outage?

Jun-09-11  PinnedPiece: <Slyusarchuck v Rybka>

I submit the doctor could not have done it without the blindfold, which would have been an excellent cover for an earpiece or....?

Nevertheless, this trick is so impressive that I am going to change out my avatar for this one, before someone else grabs it:


Premium Chessgames Member
  Colonel Mortimer: Rybka disqualified and stripped of titles..
Jun-28-11  shadowleaf04: I wonder what Chessbase will do now after this latest development. Will there be a sale of Rybka? That's just wishful thinking on my part. :)
Premium Chessgames Member
  Check It Out: Rybka has been stripped of it's world champion titles, but not before Rajlich made a boatload of money selling Rybka software. He'll have to send those trophies back though...
Jun-29-11  dx9293: Shocking...

Wow, the computer chess world has just been turned upside down!

Jump to page #    (enter # from 1 to 79)
search thread:   
< Earlier Kibitzing  · PAGE 69 OF 79 ·  Later Kibitzing>
NOTE: You need to pick a username and password to post a reply. Getting your account takes less than a minute, totally anonymous, and 100% free--plus, it entitles you to features otherwise unavailable. Pick your username now and join the chessgames community!
If you already have an account, you should login now.
Please observe our posting guidelines:
  1. No obscene, racist, sexist, or profane language.
  2. No spamming, advertising, or duplicating posts.
  3. No personal attacks against other members.
  4. Nothing in violation of United States law.
  5. No posting personal information of members.
Blow the Whistle See something that violates our rules? Blow the whistle and inform an administrator.

NOTE: Keep all discussion on the topic of this page. This forum is for this specific player and nothing else. If you want to discuss chess in general, or this site, you might try the Kibitzer's Café.
Messages posted by Chessgames members do not necessarily represent the views of, its employees, or sponsors.
Spot an error? Please suggest your correction and help us eliminate database mistakes!

home | about | login | logout | F.A.Q. | your profile | preferences | Premium Membership | Kibitzer's Café | Biographer's Bistro | new kibitzing | chessforums | Tournament Index | Player Directory | Notable Games | World Chess Championships | Opening Explorer | Guess the Move | Game Collections | ChessBookie Game | Chessgames Challenge | Store | privacy notice | contact us
Copyright 2001-2018, Chessgames Services LLC