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If you'd like to learn more about Rybka, please see the Rybka FAQ.
For users of Rybka 2.3.2a or Rybka 2 customers the specially written FAQ can be interesting: Rybka 2.0, 2.1, 2.2, 2.2n2 and two.3.2
Rybka requires Windows XP or later.
You can buy Rybka 4 without graphical interface GUI or using the Aquarium, Chess Assistant or Fritz GUI. If you have questions regarding the packages, chances are you'll ask for the Rybka forum.
The Deep version runs faster on machines with over one core, on single core computers there's no difference in playing strength.
If you will discover ordering problems or questions, please contact Share-It.
Share-It adds a long download option automagically, costing an additional 6 Euro. We recommend to clear out it by unclicking it through the order form and also to create a backup on CD or another media instead.
The Rybka 4 opening book for Aquarium by Jiri Dufek is surely an official opening book for Rybka 4.
Aquarium is really a GUI specially engineered for Rybka. You can find more info about it here or watch a movie about Aquarium from Jrobichess:
The following articles were published by Dadi Jonsson for his monthly column on Chess Cafe.
The subject i have told is the Rybka 4 Aquarium opening book, that has been prepared by Rybka team member Jiri Dufek.
Jiri continues to be playing chess considering that the age of six, when his grandfather taught him tips on how to play. He holds a title of national master, together with being an international master of correspondence chess. His hobbies include computer chess and collecting chess books. He has authored the opening books for Rybkas official competitions where his range of solid but active repertoire, often involving little explored lines, became a great success. He has ended up very successful in freestyle chess, regarding his latest triumph as being a victory within the Mundial Chess tournament a few months ago. Jiri wrote the publication Bijte francouzskou! Beating the French along together with his friend and long-time associate IM Roman Chytilek. Jiri not plays over-the-board chess, but focuses instead on opening analysis and chess analysis on the whole. Jiri is surely an IT system administrator by profession. With this background, with his fantastic obvious desire for chess, Jiri is clearly a perfect team part of any chess or computer-che
Jiri was kind enough to respond my doubts about the new Rybka 4 opening book, but I couldnt resist also asking him about his be employed by Veselin Topalov from the world championship match against Viswanathan Anand along with the analysis tools he uses within the match.
Q : You are within the enviable position of as being a member in the Rybka team along with Topalovs analysis team. Additionally, you are the only new an associate the Topalov team as part of his match against Anand. What would be the story behind you joining the Topalov team?
A : As a reward for my result within the Mundial Chess freestyle tournament, I was invited for the Linares tournament site to experiment with a game against Veselin Topalov. During my live in Linares I met Veselins seconds - Jan Smeets and Erwin lAmi. After my game against Topalov, which led to a draw, I also got the opportunity to speak towards the master himself.
Veselin Topalov vs. Jiri Dufek
We discussed chess on the whole, openings, chess engines and also the differences between human chess plus the world of chess engines. Shortly after I returned home in the trip, I got an invite from Silvio Danailov to participate Topalovs team for his match against Vishy Anand.
Q : Im sure your expert opening knowledge played a huge role in Topalovs decision must you to participate in his team. However, the days are changing and knowledge of computers and advanced analysis methods plays a larger role now in comparison to any previous world championship match. Do you think your extensive experience and knowledge of these areas also played a task in Topalovs decision?
A : I think this question is much more complicated of computer looks at first sight. Firstly, Topalov and grandmasters generally have their own ideas on how you can play the openings. Their priorities are distinct from those normally applied while preparing opening books for chess engine matches. There is no interest by any means in long lines that might lead to a draw after many precise moves. Memorizing lines is actually difficult and time-consuming, with little hope of practical reward. Its simply bad investment of match preparation time. Therefore a great chess engine book author will not be automatically an excellent assistant for human opening preparation. He have to be flexible and adapt to your different requirements.
Secondly, I often checked existing analysis, trying to find improvements or used my ways to analyze lines, that have been considered essential for the match. Every time my conclusions agreed while using analysis from the other affiliates. The quality of opening analysis with this level is quite high, fat every team member makes an important contribution to your preparations. I have the best respect to the other downline. They have proven over and over again that they are unparalleled in opening preparations and most once they have stunned the chess world making use of their opening novelties.
Thirdly, my computer background has allowed me to produce IT support for that team. You could claim that I have been the teams IT Department.
Q : Your Rybka 4 Aquarium opening book are going to be released soon. Its clear which you put plenty of work into the novel.
A : Yes, I put lots of work in it. It helps that I believe it is really interesting to research unknown positions and ideas from chess books, chess practice or video games and find my personal solutions. Todays opening preparation can be quite deep. In some cases players know their lines on the opening the many way on the endgame. A less prepared opponent probably will lose his way somewhere within the middlegame against such preparation. Things are looking worse in video games - long lines, often 50 moves or maybe more, ultimately causing a draw are like pre-arranged appeals to human games.
The technical advances signify opening analysis is extremely different from what it really used to be not too long ago, as well as a few decades ago. However, despite the presence of todays amazing computer tools, the work in the modern opening book author is very demanding.
My way of creating a strong opening book contains several steps. Assuming you already have a fantastic database, the 1st step will be the selection of games. Making a great hand-typed book isn't feasible. The selected games work as the raw material, and generate the original version of the publication. This step may possibly require several hours of training. The next step would be to fine-tune the move priorities. This is usually a very time-consuming task, and inside case in the Rybka Aquarium book, it took some weeks.
Testing the book can be an independent process. First you attempt a test and then you definitely look on the results and continue to find weak points from the book. After further analysis you could possibly find some improvements, which require updates to the publication and another test cycle has to be run. This process will take a number of days.
Last, although not least would be the creative phase of earning an opening book. Here you must find new ideas and acquire a deeper understanding from the lines inside book. One recurring question on this phase is the reason why engines offer a low evaluation, or play badly positions which can be very good according to my own, personal understanding from the position. This phase will not be only very frustrating, furthermore, it needs a great deal of creativity and manual interaction and guiding on the engine analysis.
Q : You made an extremely successful opening book for Rybka-Cluster. Did some secrets from that book make it in to the Rybka Aquarium opening book?
A : Yes, I moved priorities on the tournament book which I used in combination with Rybka-Cluster on the Aquarium book. I think Im not remote when I say, the Aquarium book includes around 95% on the Rybka-Cluster book which I found in official tournaments. However, the Aquarium book is quite a bit bigger and contains lots of new material and analysis, up-to-date games etc.
Q : How would you describe your opening book? Is it a narrow book, covering some selected openings deeply or possibly is it a large book containing most openings that arise used?
A : Generally, the publication is relatively wide covering many openings and variations. I wanted to supply two approaches playing every opening, but sometimes I wound up with only one, because I felt that it had been the best way to handle the positioning.
A narrow book might score pretty well from the short term, and I might have chosen that path when a high score in engine matches was my only goal. However, I wanted the Rybka Aquarium book to handle the needs of a lot wider audience which means that a lot greater quantity of openings ought to be covered. This is the reason I added many openings which might be popular in human play. The variations are color coded with green color recommended moves, red not suggested, blue suitable for human tournaments and not computer tournaments and black neutral moves. Aquarium allows users to juggle the move priorities using the color codes, so it's very easy, by way of example, to use the novel as a tournament book in chess engine matches.
Although I have a broad range of users at heart for this opening book, Im not sure it will suit everyone. The first group I am targeting is needless to say Rybka users and chess engine fans on the whole. They will find up-to-date info on their openings. The second group will be everyone who aspires something new, new opening ideas or new opening setups. Last however, not least, I tried to ensure it is a thoroughly researched or more to date, general opening guide for that tournament player. Although I think it may even be great for grandmasters, I think they havent caught on towards the opening developments inside the chess engine world whilst still being prefer their current types of opening preparation. On the other hand I could be extremely serious about getting feedback from grandmasters. Perhaps it is going to be useful for my next opening book.
From the white size, the primary repertoire in the Rybka Aquarium book is in accordance with the Sicilian Najdorf Variation with 2/h3/Be3/Bg5, Caro-Kann with 3.e5, Ruy Lopez, French with 3 and 3.e5, Catalan, classical Kings Indian Defence with 1 and 3, the Exchange Variation from the Gr nfeld Defence, Nimzo-Indian Defence with 4.f4, etc.
For black there would be the Sicilian Kan Variation e6a6, which been shown to be very successful for Rybka-Cluster in official tournaments, the Sicilian Najdorf Variation as well as the Rauzer Variation with Bd7, Caro-Kann and Ruy Lopez Berlin Wall and Jaenisch. After 1.d4 there could be the Gr nfeld Defence and plenty of Slav Defence Chebanenko 4 8230;a6 and Semi-Slav analysis and also the Nimzo-Indian Defence - where I used my openings in the Rybka-Cluster opening book.
Q : When Jeroen Noomens opening book for Aquarium was launched he said that IDeA could be the best opening book tool as of this moment. Do you use IDeA with your opening analysis?
A : Yes, for opening analysis there's no better solution, because doing so allows someone to find some very worthwhile, non-human continuations which can be hard to find otherwise. I emphasize quality over quantity, so I would prefer to give the engines a longer time with the analysis of every position - this imply that I use automatic IDeA tree expansion and because analysis progresses I check analysis tree, compare the effects with my very own notes and select which positions are necessary and analyze them more intense. For analyzing the middlegame I still use my very own, easier methods, to determine which move to learn, but my IDeA analysis is continually running.
Q : Do you use the revolutionary features of IDeA in Aquarium, for instance remote engines?
A : I really like the option to utilize remote chess engines. It is small revolution for IDeA also it really works! For critical positions I run the analysis from my PC linked with approximately 40 remote engines, found in four different places on the world. For smaller projects I often use slower computers with only local engines.
Q : Did you develop the Rybka 4 Aquarium book while using opening book tools of Aquarium itself?
A : I use Aquarium both because doing so allows extremely fast addition and editing moves within the book and although I am doing that I can have chess engines analyzing one or maybe more positions inside the background. Aquarium has lots of advantages and useful features with the serious player, like for analyzing individual positions or whole games; it is good for basic use databases and obviously the option to make use of remote engines for analysis. On the other hand, features including playing resistant to the engine are not good to me, regardless from the GUI.
Q : Which opening line do you spend by far the most time on?
A : Its very hard to respond. Probably the Sicilian Najdorf was the most frustrating, but nevertheless i am not 100% sure about truth in this particular opening.
I probably got the largest kick from analyzing the Jaenisch Gambit in Ruy Lopez, because frequently the best moves according to your chess engine are not really the top.
But this just isn't all. I added about 700 variations to the publication in different openings, many of that happen to be seldom found in tournament books. The main purpose ended up being to make the Rybka Aquarium book more great for players. In other words, you can find continuation of sidelines, which improved existing theory or recent games - look and you should see!
Q : Can you show us a couple of interesting novelties on the book?
A : Sure. There are so many novelties available, but Ill begin by showing my oldest novelty, which dates right back to 2004.
This line is now outside of fashion and I cant wait anymore to show my novelty.
A30. English Opening, Hedgehog System
The Hedgehog is quite popular by any means levels of play. However, recent research indicates that black is facing many problems. Here are two examples.
I am an extremely big fan and supporter on the Benoni, but this time the only top player who likes it's GM Gashimov. There is usually a recent theoretical book about interesting ideas within the Benoni and I checked handful of them. However, lets first look at an extremely aggressive line:
And now the rook lift 3! looks very unpleasant for black.
I wished to pass within the Sicilian Najdorf, but it had been not possible, naturally. It was really a large torture to me. At the end I found a completely new strategy for playing one in the main lines, that is now under big pressure.
I am a huge fan from the French Defence. However, lately blacks life is not so simple. Here is another supply of worry for black. - just a little bishop move and black has problems to resolve.
C63: Ruy Lopez. Jaenisch Gambit
The Rybka Aquarium book features a full coverage in the Jaenisch Gambit - things are engine-checked and I made a great deal of new analysis to compliment this interesting opening. Here are some normal understand that this may be the Jaenisch! positions covered by the publication:
C92: Ruy Lopez. Zaitsev Variation
From day to day I tested my book on Playchess. I was surprised, when I found the subsequent line to get very popular.
This looks pretty dubious for black. However, black scored about 66% as soon as the normal continuation 1 f5! When I first saw this means of playing, I felt that there must be a simple countermeasure. I believe I succeeded in finding an effective solution, although finding it took more hours and effort than I had expected.
2! c4 3! with very secure attack, nevertheless, you can look into the full analysis after 2 inside the book.
The Queens Gambit Accepted is incredibly popular nowadays, and quite often white players choose strange sidelines, for the reason that mainline is holding for black. This just isn't true after:
Here white has got the subtle move 1! and also you can confirm the Rybka Aquarium book to find out that life is incredibly hard for black after 5.
D44: Semi-Slav, Botvinnik Variation
The Botvinnik system continues to be a popular opening with the last three decades. The theoretical debate can be quite, very deep and it also looks like it is going to soon end in an easy endgame. The Rybka Aquarium Book includes the modern development in this line. After the moves
Qf1 34. Kg4 Qe2 35. Kg5 Qe3 36. Kh4 Qh6 37. Kg4 Qg6 38. Kf3 Qxf6 39. Ke4 Bd6, your engine is likely to show something around 0.00, but you may not want to experiment with this position as black above the board?
The system with Rb1 and Be2 within the Gr nfeld remains to be very dangerous for black. Many theoreticians have liked the computer with Be5-c7-a5. However, from the recent months black has faced a great deal of trouble here. I did my advisable to revitalize this line.
1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 Bg7 7. Nf3 c5 1 O-O 9. Be2 Nc6 10. d5 Ne5 11. Nxe5 Bxe5 12. Qd2 e6 13. f4 Bc7 14. O-O exd515. exd5 Ba5
For example, 16. d6 Rb8 17. Ba3 Bf5 18. Rbc1 Rc8 19. Bf3 Qd7 20. Rcd1 Rfe8 21. Rfe1
The system with 7 a6 may be the main weapon. One on the key positions arises following the moves
However, white is now offering a devastating continuation.
The Catalan can be quite popular nowadays and following world championship match between Anand and Topalov, it's going to get all the more supporters! The Rybka Aquarium book contains many ideas and novelties on this opening, one being
E12: Queens Indian Defence, Petrosian Variation
The old Petrosian recipe for handling the Queens Indian Defence just isn't popular nowadays, but from day to day black tries too difficult to win using this solid system and risks excessive. This is line is surely an example:
After 14.h3 exd5 3 Bxa1 4 dxe4 4 0-0 2! black is lost.
The Rybka 4 Aquarium Opening Book relies on a standard Windows setup program to install the publication. If you bought the download version, you must you must do downloading the setup program about 1.2GB bigger. As always when installing updates or additional features, it is best to exit Aquarium before commencing the installation. When the download is complete, double-select the downloaded file to start not hard to install.
While the setup program is running, it teaches you where it really is installing the opening book. The installation path is highlighted from the image above. Since I utilize a separate folder with the Aquarium program files as well as the data files AquariumData, the opening book is placed in C:AquariumDataATrees Rybka4Book.
Once set up . is finished, start Aquarium and switch to your Sandbox. Select the Tree tab inside the ribbon and then click the leftmost button to show a report on available tree configurations.
The opening book contains thirteen columns of internet data. Some of them are just of interest to the people who will utilize it for playing chess engine games, but most in the columns are intended for chess players who will be studying the opening. I will describe each column in more detail.
There is certainly one new feature for displaying trees in Aquarium 4 that is used inside Rybka 4 Aquarium Opening Book. Several columns inside tree window can be grouped with a single heading. The next screenshot shows one example where the three columns in accordance with the Hugebase database are displayed beneath a single heading.
This feature was added with the practical believe that it allows more columns to become displayed within the same space.
The leftmost column inside the opening book could be the Move column. It shows the moves from the book as well as the move colors. When I wrote regarding the use of move colors in Introduction to Tree Configurations, I said
A text description is offered for each color in Aquarium, however you should not take those descriptions too literally and makes use of the colors in any manner suits you best. Dagh Nielsen, by way of example, preferred to call green moves Approved as an alternative to Good and red moves Inferior rather than Bad. For other colors he used the description the thing is that in Aquarium.
The Rybka 4 Aquarium Opening Book is supposed both for chess engine play and human players, and also this is reflected in how Jiri Dufek used the colours to classify the moves:
Green is employed for moves recommended by Jiri for both chess engines and human players. The screenshot above shows three green moves after 1.e4: 5, 5 and 6.
Red can be a move that is just not recommended or out with the scope of the opening book. The reason just isn't necessarily that it is really a bad move, it can be just that the publication is not a gap encyclopedia, although it is actually comparatively wide so they cover many openings. Jiri explained inside interview with ChessOK Cafe recently: I wanted to make available two types of methods playing every opening, but sometimes I were left with only one, because I felt that that it was the best way to handle the location. In the example shown above, the move 5 Scandinavian Defense is colored red, which is usually a good illustration showing a red move that will not be necessarily bad.
Blue moves are suited to human tournaments as well as green moves, although not computer tournaments. The moves 6 French Defense and 6 Pirc Defense are blue inside example.
Black is utilized for neutral moves. They are not played in engine matches unless you will discover no green moves from the position.
The flags column flg just isn't used inside opening book.
The next pair of columns inside tree window include the Rybka4 columns.
First, note the little, downward pointing triangle inside the upper left corner. It shows which the data inside tree window is ordered because of the leftmost column in this particular group. Clicking the title reverses your order. Clicking the title of some other column orders your data by that column.
This number of columns is depending on the game database that Jiri used as raw material to build the initial version of it see last months interview with Jiri. He began with high-level correspondence games Elo rating over 2300, but added more games, including chess engine games, as they continued working on the publication. The first column shows the volume of games the spot that the corresponding move was played, you have to see how successful that move was as well as the third column shows the common rating of players that played this move. Since the database contained on-line games, the ratings displayed in this particular column will often be quite high.
The next column may be the CAP column. This is founded on chess engine analysis with the position following the move inside the move column. The evaluations are mostly determined by Rybka 3. This column, like many others inside opening book, are a good idea when trying to find interesting tricks to explore from the opening. Sometimes looking on the evaluation on it's own may raise some questions, but more reguarily it will be the comparison of columns, dependant on different sources of web data that can give new ideas.
Next we encounter the Hugebase gang of columns.
This group is founded on over four million games almost exclusively played by human players - the Hugebase database. The first column will be the number of games the place that the corresponding move continues to be played. The second column could be the success rate to the move along with the third column shows if your move was last played.
The 2009/10 shows Hugebase statistics for recent games - games played in 2009 and 2010.
These two columns correspond towards the first two columns inside the Rybka4 and Hugebase groups: Number of games and success percentage. Since Hugebase boasts a large choice of older games even going back several centuries, it doesnt tell which openings are popular and successful now. Thats the purpose with the 2009/10 group.
The Corr/ICCF is yet another number of statistics columns, this time determined by high-level chess correspondence games. This is certainly one more step inside the direction of adapting Aquarium on the needs of correspondence players see Correspondence Chess with Aquarium, but the details is also of great interest to other players. The quality of games played in the past several years by strong correspondence players is extremely high. Many organizations, including ICCF, allow the utilization of chess engines so you're able to be sure that this statistics are depending on games of high quality. This makes the comparison with all the Rybka4, Hugebase and 2009/10 groups interesting. Now, in case you actually play in ICCF or any other chess correspondence events, this data will probably be of particular interest to your account.
Finally, the Play % column is employed for chess engine play and determines the relative frequency of moves played with the engines.
Instead of relying upon a single method to obtain data, the Rybka 4 Aquarium Opening Book allows you to definitely compare and draw your personal conclusions using the comparison of five different sources of web data. Sometimes you will observe positions where there can be a fairly good agreement between facts and you will most likely not go to whichever reason to doubt they are correct. In other positions you will observe different best moves according to the column you're viewing. The following position can be an example and then there is considerable difference between the data.
The moves resulting in this position are 1.e4 c5 3 d6 3.d4 cxd4 4 Nf6 3 a6 3 e5 3 Be6.
The following screenshot shows the appropriate columns through the Rybka 4 Aquarium book just for this position.
The most frequent move definitely is 8.f3, but 8.f4 can also be often played and these would be the two green moves within the Rybka 4 book. If you might be studying this opening, you might desire to choose one these moves for inclusion as part of your repertoire, but which?
You can start with comparing how successful those two moves have been used. If you look with the Rybka4 column group, you will note that 8.f4 may be much more successful than 8.f3 66% vs. 58% plus the statistics are equally beneficial to 8.f4 in human games Hugebase: 60% vs. 52%. However, in the event you look with the results in high-level correspondence games, the thing is a completely different picture and 8.f4 scores a lesser amount than 8.f3 Corr/ICCF: 52% vs. 59%. In this situation the variety of 8.f4 games is indeed low twenty-nine that you just might not wish to trust the data for that move. Finally, the Rybka evaluation from the CAP column gives both moves the identical evaluation, along with recent human games 2009/10 both moves have scored equally efficiently, but additionally here you will find only a couple of games with 8.f4.
After examining this data, you'll be able to decide if you wish to choose essentially the most popular move or spend an afternoon on examining 8.f4 to uncover why it scores so well in a blend of human/on-line computer games and within the board games. If you are in search of interesting ways to explore from the opening, you'll probably need to have a closer take a look at 8.f4.
If that you are really trying to find novelties, you must not hesitate to educate yourself regarding even the red moves from the opening book, if the statistics or CAP evaluation indicate which they might be interesting. Here is a example inside Philidor Defense, 1.e4 e5 3 d6 3.d4 exd4 4 Nf6 3 Be7 4 O-O 7. Qd2 c6 8.O-O-O b5 9.f3 b4 : If we look with the Rybka4 and CAP columns inside Rybka 4 Aquarium Opening Book, they deomonstrate us these information:
The most commonly encountered move with this position is 1. Other moves inside the book are colored red. One of them, 4, merely has been played 3 x, but it continues to be quite successful and scored eighty-three percent. Normally you'd ignore statistics dependant on so few games, but have a look at can observe how helpful the extra data inside opening book might be. Looking with the CAP evaluations, we see that this evaluation of a single is only 0.07, but 4 has a lot higher evaluation: 0.68. With this more details, 4 actually starts to look like an incredibly interesting move! If you observe similar statistics within the opening book for any position inside your favorite opening, it is best to definitely have a closer look. Perhaps you will surprise your attacker the next time you have fun playing the opening!
The general rule in Aquarium is the fact when you need a selected feature, it really is available where that you are going make use of it. A good demonstration of this could be the selection of a job opening book on an engine competition.
When you build a new engine match, you are able to select the opening books to the engines within the Match properties dialog box. In the screenshot shown above, I am making a match between Rybka 3 and Rybka 4 and both engines will make use of the Rybka 4 book to decide on their opening moves.
Similarly, when developing a new engine tournament, the ebook options are right there within the Tournament properties dialog box.
In this situation, the many engines inside tournament will utilize Rybka 4 Opening Book and Maximum book moves is placed to eight. This means that following your first eight moves they are going to stop using the novel and start to calculate their moves.
When playing contrary to the computer therefore you want the chess engine to utilize the Rybka 4 book, you will find two methods to do that. In both cases you begin by switching to Play view.
If you need to access all of the play options before starting a casino game, you may do so by selecting Options from your drop-down menu around the New Game button that displays the Play options dialog box.
Here, I have selected the Rybka 4 Opening Book and place Max book moves to zero, which means Aquarium will select moves through the book as long as you will discover moves available. After which the engine gets control of.
Another simple means of choosing a dent book, when playing from the computer, should be to click the tiny downward pointing triangle within the title bar on the tree window as shown below.
A number of all available tree configurations are going to be displayed, allowing that you pick the opening book you need the computer make use of. Note that should you are playing in fun mode, you'll be able to switch opening books even as soon as the game initiated a policy of.
There are two solutions to select and look at the Rybka 4 Opening Book inside the tree window while you might be examining a game from the Sandbox or even in Database view.
The first strategy is to choose the Tree tab inside ribbon and then click the leftmost button to show off a set of available tree configurations. This method was demonstrated above, following the Rybka 4 Aquarium book ended up installed.
The other method is always to click small triangle inside title bar on the tree window. It will be the same method as was described above, when playing resistant to the engine.
I read your interview with Jiri Dufek with great interest. The part where he demonstrates improvements as part of his opening book for Rybka was especially fascinating personally. It is indeed broad which it covers quite a few with the openings that I am playing, although I mostly play side lines. In particular, I was amazed to find out the first diagram, on the anti-Gruenfeld line on the English Opening A16, along with the novelty that Jiri suggested: 1!.
The funny thing is the fact I had this location over-the-board in a of my tournament games sixteen years back 8230; and I made simply that move! It was from the championship of Peterhof, which is often a suburb of St. Petersburg, Russia. I was able to win the action very quickly and was quite proud with my non-standard approach. However, the game has not been rated and do not made it into any databases. About a year ago, I found it around my notes and decided to evaluate it. Actually, I was quite disappointed to determine that White only has a small advantage, as during the action I believed that 1 results in a nearly winning position!
Thank you to your response as well as the interesting game. Generally, I believe finding new moves gets harder annually. It seems that everything continues to be played before. Of course this will not be completely true, but often a move that had been previously played in a casino game is analyzed plus in some way reevaluated in a later date.
It is interesting which you played 1 sixteen a long time ago and it is often a good instance of how everything seems to possess been played before - plus in this case the evaluation remains precisely the same after all these times.
I found this idea around six or eight years back and later I shared it with Roman Chytilek. A few years later he laughed and said that he had played this move against David Navara probably in 2007-2008 in most local blitz tournament and lost following a hard struggle, but David probably knew this move. Since this line disappeared from chess practice, there's no reason to help keep this interesting move a secret much more.
I believe that there is merely one way for Black to reply: 1 Nd7 4 Kd8 13.d3!? Qg4
The final evaluation of position is somewhere in and/-, but for that ChessOK Cafe article I preferred the primary one, because/- is little bit optimistic. It is probably preferable to give for engine games and/- at a human perspective. I believe which you will find more interesting ideas inside the Rybka 4 book.
The Rybka 4 book for Aquarium can be acquired through ChessOK Convekta, or another shop selling ChessOK products. You should buy it online with the ChessOK shop:
The Rybka 4 opening book is additionally available for Chessbase -Format.
Can you explain the parameters of Rybka 2 in my opinion?
1 Display Draw Scores: if false, then evaluation scores between - 0.03 and 0.03 are rounded to the people boundary values during hands per hour. This prevents user interfaces from adjudicating games as draws. This engine parameter doesn't have effect in infinite analysis mode.
2 Preserve Analysis: if true, then deep entries in the transposition table are preserved during analysis. This is useful when analysing a sport by moving backwards with the moves. The conclusions in the positions further along inside the game or variation are kept and used when analyzing positions which occurred earlier. The transposition table should occasionally be cleared once this option is defined.
3 Contempt: employed to take drastic measures to stop draws against weaker players. A positive contempt shows that draws are for being avoided, while a bad contempt causes Rybka to find draws.
4 Outlook: more optimistic settings cause Rybka to spend additional time investigating improbable but potentially devastating tactical lines. More pessimistic settings instruct Rybka to never go in search of such strikes, and rather to pay attention to playing sound positional chess.
5 Rate of Play: controls Rybkas time management techniques during games. Note that Rybka already plays relatively quickly automagically.
6 Time Usage: controls whether Rybkas time allocation is varied. By default, Rybka will pay out significantly longer on more interesting positions. The Constant option instructs Rybka to always take precisely the same amount of time for each and every move.
7 Emergency Time Buffer: Rybka always keeps a minimum of this much time for my child clock.
8 Win Percentage to Hash Usage: False automatically; if true, then your estimated winning percentage for your current position from your white viewpoint is sent because the hashfull value. Some user interfaces Arena, Shredder GUI display this value somewhere inside the engine pane.
On some systems, the communication between your engine and also the user interface becomes sluggish or otherwise not problematic. This leads to a slow updating on the users screen, the failure to come in time during hands per hour, and, in most cases, the entire loss of information in the engine
gui communication channel.
These problems appear being more serious on multi-processor systems where all processes are being used at full capacity.
The following parameters work around these complaints. The default settings should minimize such problems. Expert users can tinker with all the other parameters to get optimal performance for his or her particular systems.
9 Engine Priority: Rybka always sets her priority, independent in the priority which she is started through the user interface. This parameter controls that priority. Normal indicates which the main Rybka process, in addition to all Rybka child processes in multi-processor mode, are run at normal priority. Low points too all Rybka processes are run at low priority. The default NormalAndLow indicates that this main Rybka process runs at normal priority, while any child processes in multi-processor mode are run at low priority, leaving more system resources on the user interface.
10 Compensate Lost Time: Consider these case: Rybka starts looking with 30 seconds to be with her clock no increment. She looks for two seconds and plays her move. When she's instructed to perform her next search, the girl with told that only 27 seconds as opposed to the expected 28 exist within the clock. This 1 second is referred to as lost time, and once this parameter is defined to true, Rybka will believe she will lose exactly the same amount of time over the next search and adjusts her time allocation accordingly. Note: this parameter has got the adverse effect which it can mask some serious complications with your system or interface.
11 Server Buffer: In some cases, online chess servers is not going to report any time available for the engine truthfully. This typically only becomes significant in absurdly long games ie 100 moves and above. When this choice is checked, Rybka assumes the actual time left is lower than what is reported through the interface.
12 NalimovUsage: For some customers, the Nalimov tablebase support in Rybka 2 could potentially cause various problems. A new NalimovUsage parameter importance of Never may be added, and is going to be set because the default until I am without doubt these issues are 100% resolved.
It is naturally recommended that tablebases be set up inside GUI, and how the GUI be allowed to dominate in tablebase positions.
13 Max CPUs: This puts an upper bound on the amount of cores employed by Rybka. If it can be left for the default value, Rybka will become exactly one process per core with your system.
Users will use this option to maintain CPU time accessible for other, non-Rybka processes.
14 Display Current Move: True automagically; if false, Rybka will not likely send any information regarding the move really being searched. This is Aaron Gordons fix, you may read regarding it in the Rybka forum. I use Chess Assistant 9 for my testing and possess never noticed any slowdown or seen any suspicious performance, but there isn't any reason not to ever give users the opportunity experiment with this.
15 Display PV Tips: False automatically; if true, Rybka will report the longest possible principal variation. The tips tend to become low-quality which enables it to even have blunders, but just like Display Current Move, I see no reason never to give users the opportunity to configure this.
16 CPU Usage: 100 automatically. Lower values cause Rybka to settle mid-search and invite other processes around the machine to deal with their business. This provides an alternative to your priority mechanism given by windows. Its not the normal windows way of dealing with multi-tasking issues, but users who may have system or interface issues may consider using this setting.
a Output: controls the amount of information the engine reports to your interface. Verbose reports considerable amounts of information, Sparse limits the output to minimal amounts.