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The following articles were provided by Dadi Jonsson for his monthly column on Chess Cafe.
The subject as soon as i've is the Rybka 4 Aquarium opening book, that was prepared by Rybka team member Jiri Dufek.
Jiri is playing chess because the age of six, when his grandfather taught him how you can 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 collection of solid but active repertoire, often involving little explored lines, been shown to be a great success. He has ended up very successful in freestyle chess, together with his latest triumph as being a victory from the Mundial Chess tournament a few months ago. Jiri wrote the ebook Bijte francouzskou! Beating the French along in reference to his friend and long-time associate IM Roman Chytilek. Jiri no more plays over-the-board chess, but focuses instead on opening analysis and chess analysis on the whole. Jiri is definitely an IT system administrator by profession. With this background, and his awesome obvious love for chess, Jiri is clearly an excellent team person in any chess or computer-che
Jiri was kind enough to respond to my questions the new Rybka 4 opening book, but I couldnt resist also asking him about his be employed by Veselin Topalov inside world championship match against Viswanathan Anand plus the analysis tools he uses from the match.
Q : You are inside the enviable position of like a member from the Rybka team and also Topalovs analysis team. Additionally, you're the only new part of the Topalov team as part of his match against Anand. What may be the story behind you joining the Topalov team?
A : As a reward for my result inside Mundial Chess freestyle tournament, I was invited on the Linares tournament site to try out a game against Veselin Topalov. During my be in Linares I met Veselins seconds - Jan Smeets and Erwin lAmi. After my game against Topalov, which resulted in a draw, I also got the chance to speak on the master himself.
Veselin Topalov vs. Jiri Dufek
We discussed chess generally speaking, openings, chess engines as well as the differences between human chess along with the world of chess engines. Shortly after I returned home from your trip, I got a party's invitation from Silvio Danailov to become listed on Topalovs team for his match against Vishy Anand.
Q : Im sure that the expert opening knowledge played a large role in Topalovs decision to inquire about you to participate his team. However, the occasions are changing and knowledge of computers and advanced analysis methods plays a greater role now in comparison to any previous world championship match. Do you think that your particular extensive experience and knowledge during these areas also played a job in Topalovs decision?
A : I think this question is a lot more complicated personal computer looks at first sight. Firstly, Topalov and grandmasters normally have their own ideas on the way to play the openings. Their priorities are totally different from those normally applied while preparing opening books for chess engine matches. There is no interest in any respect in long lines which could lead to a draw after a large number of precise moves. Memorizing lines is very and time-consuming, with little hope of practical reward. Its simply bad investment of match preparation time. Therefore a superb chess engine book author just isn't 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, searching for improvements or used my approaches to analyze lines, that had been considered very important to the match. Every time my conclusions agreed with all the analysis with the other downline. The quality of opening analysis only at that level is quite high, in reality every team member makes an important contribution for the preparations. I have the very best respect for that other associates. They have proven repeatedly that they are unparalleled in opening preparations and most once they have stunned the chess world using opening novelties.
Thirdly, my computer background has allowed me to offer 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 it.
A : Yes, I put many work engrossed. It helps that I think it is really interesting to assess unknown positions and ideas from chess books, chess practice or on-line games and find my personal solutions. Todays opening preparation can be quite deep. In some cases players know their lines from your opening every one of the way on the endgame. A less prepared opponent probably will lose his way somewhere from the middlegame against such preparation. Things are looking worse in on-line computer games - long lines, often 50 moves if not more, resulting in a draw are like pre-arranged draws human games.
The technical advances show that opening analysis is incredibly different from what it really used to be a short while ago, let alone a few decades ago. However, despite the presence of todays amazing computer tools, the work on the modern opening book author remains very demanding.
My means of creating a strong opening book includes several steps. Assuming you already have a superb database, the 1st step will be the selection of games. Making an excellent hand-typed book doesn't seem possible. The selected games function as the raw material, and generate your initial version of the novel. This step may require a couple of hours at work. The next step should be to fine-tune the move priorities. This is often a very frustrating task, and from the case in the Rybka Aquarium book, it took a number of weeks.
Testing the publication is an independent process. First you operate a test and then you definately look on the results and continue to find weak points from the book. After further analysis you'll find some improvements, which require updates to the ebook and another test cycle have to be run. This process will take some days.
Last, however, not least may be the creative phase of earning an opening book. Here you must find new ideas and find a deeper understanding in the lines from the book. One recurring question on this phase means that engines offer a low evaluation, or play badly positions that are very good according to my understanding from the position. This phase isn't only very time-consuming, additionally, it needs lots of creativity and manual interaction and guiding in the engine analysis.
Q : You made an exceptionally successful opening book for Rybka-Cluster. Did some secrets from that book make it into your Rybka Aquarium opening book?
A : Yes, I moved priorities through the tournament book which I in combination with Rybka-Cluster towards the Aquarium book. I think Im not remote when I say, which the Aquarium book includes around 95% with the Rybka-Cluster book which I utilized in official tournaments. However, the Aquarium book is really a lot 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 a number of selected openings deeply or perhaps it a diverse book containing most openings that arise used?
A : Generally, the ebook is relatively wide covering many openings and variations. I wanted to supply two techniques used in playing every opening, but sometimes I wound up with only one, because I felt that it turned out the best way to handle the job.
A narrow book might score pretty well inside the short term, and I can have chosen that path if your high score in engine matches was my only goal. However, I wanted the Rybka Aquarium book to deal with the needs of a lot wider audience which means that an extremely greater quantity of openings ought to be covered. This means that I added many openings that are popular in human play. The variations are color coded with green color recommended moves, red not suggested, blue suited to human tournaments however, not computer tournaments and black neutral moves. Aquarium allows users to juggle the move priorities using the color codes, so it is easy, for example, to use the publication as a tournament book in chess engine matches.
Although I have a large range of users under consideration for this opening book, Im not without doubt it will suit everyone. The first group I am targeting is needless to say Rybka users and chess engine fans normally. They will find up-to-date details about their openings. The second group will be everyone who desires something new, new opening ideas or new opening setups. Last and not least, I tried to allow it to be a thoroughly researched or over to date, general opening guide with the tournament player. Although I think it might be helpful for grandmasters, I think they havent caught on for the opening developments inside chess engine world nevertheless prefer their current strategies to opening preparation. On the other hand I could be extremely enthusiastic about getting feedback from grandmasters. Perhaps it will likely be useful for my next opening book.
From the white size, the leading repertoire on 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 in the Gr nfeld Defence, Nimzo-Indian Defence with 4.f4, etc.
For black there will be the Sicilian Kan Variation e6a6, which became very successful for Rybka-Cluster in official tournaments, the Sicilian Najdorf Variation along with the Rauzer Variation with Bd7, Caro-Kann and Ruy Lopez Berlin Wall and Jaenisch. After 1.d4 there may be the Gr nfeld Defence and lots of Slav Defence Chebanenko 4 8230;a6 and Semi-Slav analysis along with the Nimzo-Indian Defence - where I used my openings through 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 only at that moment. Do you use IDeA as part of your opening analysis?
A : Yes, for opening analysis there isn't a better solution, since it allows that you find some worth it to read, non-human continuations which could well be hard to find otherwise. I emphasize quality over quantity, so I would prefer to give the engines a longer time to the analysis of each and every position - this show that I use automatic IDeA tree expansion and as being the analysis progresses I check analysis tree, compare the effects with my notes and judge which positions are essential and analyze them deeper. For analyzing the middlegame I still use my, incredibly easier methods, to make a decision which move to experience, but my IDeA analysis is consistently running.
Q : Do you use the brand new features of IDeA in Aquarium, for example remote engines?
A : I really like the option make use of remote chess engines. It is small revolution for IDeA also it really works! For critical positions I run the analysis from my PC associated 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 with all the opening book tools of Aquarium itself?
A : I use Aquarium both because doing so allows very quickly addition and editing moves from the book even though I am doing that I can have chess engines analyzing one or even more positions inside the background. Aquarium has lots of advantages and useful features with the serious player, for example for analyzing individual positions or whole games; it is also good for basic work together with databases and naturally the option to make use of remote engines for analysis. On the other hand, features like playing resistant to the engine are not good to me, regardless with the GUI.
Q : Which opening line do you spend probably the most time on?
A : Its very hard to reply to. Probably the Sicilian Najdorf was the most cumbersome, however i am not 100% sure about truth in this particular opening.
I probably got the greatest kick away from analyzing the Jaenisch Gambit in Ruy Lopez, because usually the best moves according on the chess engine are not really the top.
But this isn't all. I added about 700 variations to the ebook in different openings, many of that are seldom observed in tournament books. The main purpose ended up being to make the Rybka Aquarium book more helpful for players. In other words, you can find continuation of sidelines, which improved existing theory or recent games - look and you'll see!
Q : Can you show us several interesting novelties from the novel?
A : Sure. There are so many novelties available, but Ill you must do showing my oldest novelty, which dates entirely back to 2004.
This line is now away from fashion and I cant wait ever again to show my novelty.
A30. English Opening, Hedgehog System
The Hedgehog is quite popular by any means levels of play. However, recent studies show that black is facing lots of problems. Here are two examples.
I am an incredibly big fan and supporter from the Benoni, the good news is the only top player who likes it truly is GM Gashimov. There is really a recent theoretical book about interesting ideas inside Benoni and I checked a couple of them. However, lets first look at an incredibly aggressive line:
And now the rook lift 3! looks very unpleasant for black.
I wished to pass above the Sicilian Najdorf, but it absolutely was not possible, certainly. It was really a huge torture in my opinion. At the end I found a uniquely new strategy for playing one in the main lines, that is now under big pressure.
I am an enormous fan with the French Defence. However, recently blacks life is not so simple. Here is another method to obtain worry for black. - a bit bishop move and black has problems to unravel.
C63: Ruy Lopez. Jaenisch Gambit
The Rybka Aquarium book incorporates a full coverage from the Jaenisch Gambit - all things are engine-checked and I made a great deal of new analysis to back up this interesting opening. Here are some normal understand that this could be the Jaenisch! positions covered by the novel:
C92: Ruy Lopez. Zaitsev Variation
From day to day I tested my book on Playchess. I was surprised, when I found this line to get very popular.
This looks pretty dubious for black. However, black scored about 66% following normal continuation 1 f5! When I first saw this technique of playing, I felt that there would have to be a simple countermeasure. I feel that I succeeded in finding a straightforward solution, although finding it took added time and effort than I had expected.
2! c4 3! with quite strong attack, however you can examine the full analysis after 2 from the book.
The Queens Gambit Accepted is incredibly popular nowadays, and frequently white players choose strange sidelines, as the mainline is holding for black. This will not be true after:
Here white has got the subtle move 1! and you also can look into the Rybka Aquarium book to determine that life is extremely hard for black after 5.
D44: Semi-Slav, Botvinnik Variation
The Botvinnik system has become a popular opening to the last many years. The theoretical debate is extremely, very deep and yes it looks like it's going to soon end in an effective endgame. The Rybka Aquarium Book includes the most recent development on 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 will likely show something around 0.00, but do you want to experience this position as black above the board?
The system with Rb1 and Be2 from the Gr nfeld remains very dangerous for black. Many theoreticians have liked it with Be5-c7-a5. However, within the recent months black has faced plenty of trouble here. I did my far better 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 with the key positions arises following moves
However, white presently has a devastating continuation.
The Catalan is incredibly popular nowadays and following world championship match between Anand and Topalov, it can get much more supporters! The Rybka Aquarium book contains many ideas and novelties with this opening, one too being
E12: Queens Indian Defence, Petrosian Variation
The old Petrosian recipe for handling the Queens Indian Defence is just not popular nowadays, but from day to day black tries too difficult to win using this solid system and risks an excessive amount of. 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 it. If you bought the download version, you must start with downloading the setup program about 1.2GB in dimensions. As always when installing updates or the latest features, you ought to exit Aquarium before commencing the installation. When the download is complete, double-go through the downloaded file to start cellular phone.
While the setup program is running, it demonstrates to you where it can be installing the opening book. The installation path is highlighted inside image above. Since I make use of a separate folder with the Aquarium program files and also the data files AquariumData, the opening book is set up in C:AquariumDataATrees Rybka4Book.
Once not hard to install is finished, start Aquarium and switch on the Sandbox. Select the Tree tab within the ribbon and then click the leftmost button to show off a set of available tree configurations.
The opening book contains thirteen columns of knowledge. Some of them are merely of interest to individuals who will put it on for playing chess engine games, but most with the columns are intended for chess players that are studying the opening. I will describe each column in depth.
There is a new feature for displaying trees in Aquarium 4 that is used from the Rybka 4 Aquarium Opening Book. Several columns from the tree window is now grouped with a single heading. The next screenshot shows an illustration where the three columns using the Hugebase database are displayed with a single heading.
This feature was added for that practical belief that it allows more columns for being displayed from the same space.
The leftmost column inside the opening book may be the Move column. It shows the moves within the book and also the move colors. When I wrote concerning the use of move colors in Introduction to Tree Configurations, I said
A text description is offered for each color in Aquarium, nevertheless, you should not take those descriptions too literally and utilize colors by any means suits you best. Dagh Nielsen, for instance, preferred to call green moves Approved rather than Good and red moves Inferior as opposed to Bad. For other colors he used the description the truth is in Aquarium.
The Rybka 4 Aquarium Opening Book was created both for chess engine play and human players, this also is reflected in how Jiri Dufek used the shades to classify the moves:
Green can be used 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 on the scope with this opening book. The reason will not be necessarily that it truly is a bad move, it really is just that the publication is not a job opening encyclopedia, although it is pretty wide so they cover many openings. Jiri explained inside interview with ChessOK Cafe a few weeks ago: I wanted to present two techniques used in playing every opening, but sometimes I were left with only one, because I felt that that it was the best way to handle the career. In the example shown above, the move 5 Scandinavian Defense is colored red, which is a great example of a red move that isn't necessarily bad.
Blue moves are suitable for human tournaments together with green moves, although not computer tournaments. The moves 6 French Defense and 6 Pirc Defense are blue from the example.
Black is employed for neutral moves. They are not played in engine matches unless you can find no green moves from the position.
The flags column flg will not be used inside the opening book.
The next group of columns within the tree window are definitely the Rybka4 columns.
First, note your little friend, downward pointing triangle inside the upper left corner. It shows that this data from the tree window is ordered because of the leftmost column with this group. Clicking the title reverses your order. Clicking the title of some other column orders the details by that column.
This band of columns is in line with the game database that Jiri used as raw material to get the initial version of the ebook 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, when he continued working on it. The first column shows the variety of games in which the corresponding move was played, only then do we see how successful that move was along with the third column shows the common rating of players that played this move. Since the database contained on-line games, the ratings displayed with this column in many cases are quite high.
The next column would be the CAP column. This is founded on chess engine analysis from the position as soon as the move inside move column. The evaluations are mostly dependant on Rybka 3. This column, like many others inside the opening book, may help when in search of interesting tips to explore inside opening. Sometimes going through the evaluation alone may raise some questions, but more regularly it may be the comparison of columns, according to different sources of knowledge that can give new ideas.
Next we encounter the Hugebase list of columns.
This group is dependant on over four million games almost exclusively played by human players - the Hugebase database. The first column may be the number of games the place that the corresponding move may be played. The second column could be the success rate to the move along with the third column shows once the move was last played.
The 2009/10 shows Hugebase statistics for recent games - games played in 2009 and 2010.
These two columns correspond for the first two columns from the Rybka4 and Hugebase groups: Number of games and success percentage. Since Hugebase includes a large number of older games even going back some 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 band of statistics columns, this time depending on high-level chess correspondence games. This is more step inside direction of adapting Aquarium to your 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 few years by strong correspondence players is incredibly high. Many organizations, including ICCF, allow the by using chess engines so that you can be sure how the statistics are determined by games of high quality. This makes the comparison using the Rybka4, Hugebase and 2009/10 groups interesting. Now, when you actually play in ICCF or another chess correspondence events, this data are going to be of particular interest for you.
Finally, the Play % column is utilized for chess engine play and determines the relative frequency of moves played with the engines.
Instead of depending on a single way to obtain data, the Rybka 4 Aquarium Opening Book allows one to compare and draw your individual conclusions in accordance with the comparison of five different sources of internet data. Sometimes you'll see positions where there can be a fairly good agreement between facts and you will likely not use whatever reason to doubt that they're correct. In other positions you will note different best moves with respect to the column you might be viewing. The following position is undoubtedly an example and then there is considerable difference between facts.
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 kind of columns on the Rybka 4 Aquarium book due to this position.
The most popular move by far and away is 8.f3, but 8.f4 is usually often played and these will be the two green moves from the Rybka 4 book. If you happen to be studying this opening, you might desire to choose one of those moves for inclusion inside your repertoire, but what kind?
You can start with comparing how successful both of these moves have been used. If you think about the Rybka4 column group, you'll see that 8.f4 may be much more successful than 8.f3 66% vs. 58% along with the statistics are equally best for 8.f4 in human games Hugebase: 60% vs. 52%. However, if you consider the results in high-level correspondence games, the thing is that a completely different picture and 8.f4 scores under 8.f3 Corr/ICCF: 52% vs. 59%. In this example the variety of 8.f4 games is indeed low twenty-nine that you just might not need to trust the stats for that move. Finally, the Rybka evaluation within the CAP column gives both moves exactly the same evaluation, as well as in recent human games 2009/10 both moves have scored just as well, but here you will discover only a couple of games with 8.f4.
After examining this data, you'll be able to decide if you need to choose essentially the most popular move or invest some time on examining 8.f4 to determine why it scores so well in the a blend of human/video games and in the board games. If you are trying to find interesting tricks to explore from the opening, you'll probably wish to have a closer have a look at 8.f4.
If that you are really searching for novelties, it is best to not hesitate for more information on even the red moves within the opening book, once the statistics or CAP evaluation indicate they might be interesting. Here is certainly one example inside the 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 glance at the Rybka4 and CAP columns inside Rybka 4 Aquarium Opening Book, they deomonstrate us the subsequent information:
The most typical move in this particular position is 1. Other moves from the book are colored red. One of them, 4, merely has been played 3 x, but it may be quite successful and scored eighty-three percent. Normally you'd probably ignore statistics according to so few games, but have a look at can observe helpful the excess data inside opening book is usually. Looking with the CAP evaluations, we see the evaluation of merely one is only 0.07, but 4 has a substantially higher evaluation: 0.68. With this further information, 4 begins to look like an extremely interesting move! If the thing is similar statistics inside the opening book for any position within your favorite opening, you need to definitely have a closer look. Perhaps you will surprise the opponent the next time you have fun playing the opening!
The general rule in Aquarium is always that when you need a specific feature, it's available where that you are going to work with it. A good instance of this could be the selection of a job opening book on an engine competition.
When you build a new engine match, you'll be able to select the opening books for your engines from 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 utilize the Rybka 4 book to choose their opening moves.
Similarly, when making a new engine tournament, the novel options are right there within the Tournament properties dialog box.
In this situation, every one of the engines within the tournament will makes use of the Rybka 4 Opening Book and Maximum book moves is scheduled to eight. This means that following the first eight moves they are going to stop using the publication and start to calculate their moves.
When playing up against the computer therefore you want the chess engine to work with the Rybka 4 book, you'll find two solutions to do that. In both cases you begin with switching to Play view.
If you need to access every one of the play options before starting an activity, it is possible to do so by selecting Options through the drop-down menu for the New Game button that displays the Play options dialog box.
Here, I have selected the Rybka 4 Opening Book and hang up Max book moves to zero, meaning that Aquarium will select moves from the publication as long as you'll find moves available. After the engine gets control.
Another simple approach to choosing a gap book, when playing resistant to the computer, should be to click your little friend downward pointing triangle from the title bar in the tree window as shown below.
A listing of all available tree configurations will probably be displayed, allowing one to pick the opening book you need the computer to utilize. Note that in case you are playing in fun mode, you may switch opening books even following your game has begun.
There are two techniques to select and look at the Rybka 4 Opening Book from the tree window while that you are examining a game within the Sandbox or perhaps Database view.
The first technique is to choose the Tree tab inside the ribbon and click on the leftmost button to show off a number of available tree configurations. This method was demonstrated above, as soon as the Rybka 4 Aquarium book have been installed.
The other method is always to click the tiny triangle inside title bar with the tree window. It would be the same method as was described above, when playing from the engine.
I read your interview with Jiri Dufek with great interest. The part where he demonstrates improvements within his opening book for Rybka was especially fascinating in my opinion. It is really broad so it covers quite a few on the openings that I am playing, though I mostly play side lines. In particular, I was amazed to find out the first diagram, from your anti-Gruenfeld line from the English Opening A16, along with the novelty that Jiri suggested: 1!.
The funny thing is I had this location over-the-board in a of my tournament games sixteen a long time ago 8230; and I made just that move! It was from the championship of Peterhof, that's a suburb of St. Petersburg, Russia. I was able to win the sport very quickly and was quite proud with my non-standard approach. However, the game has not been rated and not made it into any databases. About a year ago, I found it inside 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 and also the interesting game. Generally, I imagine that finding new moves is becoming harder each year. It seems that everything is played before. Of course this isn't completely true, but usually a move which was previously played in an activity is analyzed as well as in some way reevaluated for a later date.
It is interesting that you just played 1 sixteen years ago also it is a superb example of how everything seems to possess been played before - along with this case the evaluation remains the identical after all on this occasion.
I found this idea around six or eight in the past and later I shared it with Roman Chytilek. A few years later he said that he had played this move against David Navara probably in 2007-2008 in many local blitz tournament and lost after having a hard struggle, but David probably knew this move. Since this line disappeared from chess practice, there isn't a reason to maintain this interesting move a secret any longer.
I believe that there is one way for Black to reply: 1 Nd7 4 Kd8 13.d3!? Qg4
The final evaluation of position is somewhere within and/-, but for your ChessOK Cafe article I preferred the 1st one, because/- is little bit optimistic. It is probably safer to give for engine games and/- at a human perspective. I believe that you simply will find more interesting ideas within the Rybka 4 book.
The Rybka 4 book for Aquarium can be obtained through ChessOK Convekta, or other shop selling ChessOK products. You can purchase it online with the ChessOK shop:
The Rybka 4 opening book is usually available for Chessbase -Format.
Can you explain the parameters of Rybka 2 in my experience?
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 from your transposition table are preserved during analysis. This is useful when analysing a casino game by moving backwards over the moves. The conclusions with 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 scheduled.
3 Contempt: accustomed to take drastic measures to stop draws against weaker players. A positive contempt suggests that draws are for being avoided, while a poor contempt will result in Rybka to search for draws.
4 Outlook: more optimistic settings cause Rybka to spend additional time investigating improbable but potentially devastating tactical lines. More pessimistic settings instruct Rybka not to ever go trying to find such strikes, and rather to target playing sound positional chess.
5 Rate of Play: controls Rybkas time management planning 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 added time on more interesting positions. The Constant option instructs Rybka to always take a similar amount of time per 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 automagically; if true, then this estimated winning percentage with the current position through the white standpoint is sent because the hashfull value. Some user interfaces Arena, Shredder GUI display this value somewhere from the engine pane.
On some systems, the communication involving the engine along with the user interface becomes sluggish or else problematic. This ends up with a slow updating on the users screen, the failure to move around in time during gameplay, and, in many cases, the entire loss of information in the engine
graphical user interface communication channel.
These problems appear to become more serious on multi-processor systems where all processes are widely-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 acquire optimal performance because of their particular systems.
9 Engine Priority: Rybka always sets her very own priority, independent in the priority that she is started through the user interface. This parameter controls that priority. Normal indicates that this main Rybka process, together with all Rybka child processes in multi-processor mode, are run at normal priority. Low signifies that all Rybka processes are run at low priority. The default NormalAndLow indicates which the main Rybka process operates 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 the subsequent case: Rybka starts specific searches with 30 seconds to be with her clock no increment. She quest for two seconds and plays her move. When she actually is instructed to perform her next search, jane is told that only 27 seconds instead of the expected 28 exist about the clock. This 1 second is known as lost time, and once this parameter is determined to true, Rybka will believe she will lose precisely the same amount of time in the next search and adjusts her time allocation accordingly. Note: this parameter provides the adverse effect which it can mask some serious difficulty with your system or interface.
11 Server Buffer: In some cases, online chess servers is not going to report enough time available on the engine truthfully. This typically only becomes significant in absurdly long games ie 100 moves and above. When this choice is checked, Rybka assumes that this actual time left is below what is reported through the interface.
12 NalimovUsage: For some customers, the Nalimov tablebase support in Rybka 2 could cause various problems. A new NalimovUsage parameter importance of Never continues to be added, and will likely be set because default until I am without doubt these issues are 100% resolved.
It is needless to say recommended that tablebases be set up from the GUI, and that this GUI be allowed to control you in tablebase positions.