Go to this site: https://www.schachversand.de/e/detail/software/640.html
There is a release anouncement on top followed by text of an interview with Vas . I didnt get the impression Vas is shaking in his boots.
Google translator gives the interview thus:
Interview with the programmer of Rybka 4, Vasik Rajlich:
Rybka 4 is much stronger as compared with Rybka 3? What areas have been improved specifically? Is it possible to estimate the Elo of Rybka 4?
Rybka 4 is improved in many areas. The search is faster and more efficient, and the assessment is more accurate. I have worked on almost every area a little. A significant improvement is in the understanding of King attacks.
As for Elo - this is a question for the testers. The exact number will depend on the test conditions.
How do you go in the improvement of Rybka?
Normally I take me a field and prove to dozens of small changes, which I then held either reject or confirm, based on the results of an automated test procedure that I have developed over the last few years step by step.
The process is incremental - since Rybka 3 has over 3,000 unique Rybka versions given, and each plays differently.
How much improved Rybka, when multiple processors are used in parallel?
A good rule of thumb is if you double the number of processors, then increased Rybka "speed" by a factor of 1.7.
How would you describe Rybka's playing style ben? Rybka is in certain types of position openings or particularly strong? Recom-
You are missing a special opening book for Rybka 4?
Rybka's style evolved and I myself can not judge the likely best. What I can say, however, is that Rybka with time has become more aggressive and tactical. Rybka Rybka versions up to 2.3.2 were compared to other programs tactical relatively weak, and that's also noticed many grandmasters. As for computer chess, there are GMs in my experience, usually an interesting mix of ignorance regarding technical questions and a rather clever eye for the weaknesses of each program.
The improvement of tactical alertness was certainly in the last few years an important focus for me.
As for the opening book - author of the Rybka opening book is 4-Jiri Dufek. He has used for analysis and test of Lukas' cluster (see chessbase.com / newsdeteil.asp? Newsid = 5444), and this book is much deeper and more accurate than any other, which is currently available. It is noted that the book will be "objectively" - Jiri was keen to find the truth and not some variants that are Rybka. This is a deliberate decision of our team. Our goal is to provide objective analysis tools. That's what users want, and it also makes life a little easier Jiris, he must take care not about how Rybka developed.
What is the relation between search and knowledge in Rybka 4?
Knowledge guides the search - Rybka examine those things that say of him whom his heuristics, they are important.
By courtesy
ChessBase Magazine No. 135 / ChessBase GmbH
