Author: Michael Diosi
Date: 02:37:08 08/24/05
Hello Mainbook 7.0 is available for download. This new version contains 171.684 variations and a depth of 68 plys. It's size is 6.42Mb And here is a description of the book in Harry's own words, in English. The main purpose of this new Mainbook version was not to enlarge the contents, but to change and improve alredy existing lines. Opening books that are too large are better qualified to train humans in chess openings than for games between engines. Therefore I want to avoid that the Mainbook increases too much. As the Mainbook is a general opening book that can be used by all engines running under Arena I have to take care for the neutrality of the generated positions. They should not favour a special playing style. For example lines are avoided that lead to positions with sacrificed material for a strong attack or lines that lead to closed positions with pawn chains where a breakthrough is very difficult. Lines of the first kind favour tactical engines, whilst lines of the second kind improve the chances of weaker engines not to lose against top engines. As in previous Mainbook versions the length of the opening lines varies in dependence upon their complexity. The positions generated by the book should be suited for top engines as well as for weaker ones. I already intended this hitherto but this time I sharpened the criteria to achieve this goal. If a book generates only simple positions that allow only simple continuations the result is a standardization that handicaps the better engines. Therefore the generated positions should allow not only simple continuations but also strategically deep ones. Thank you Harry. As usual you can find it at http://www.playwitharena.com in the user section. Michael
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