Choose an opening book by clicking on a title.
Click on the right half of a row if you want to play Black.

This game demonstrates how to implement opening books in Zillions.
Chess players can now create their own additional opening books in Zillions.

The ECO chess opening book used for this game can be found as part of the Books-W file. For the implementation in Zillions, it has been split into smaller parts.
These implemented Zillions opening books have the following characteristics:
- they are easy to read (collection of given moves formatted by indentation)
- they can be easily edited by you to your liking with any text editor
- they are arbitrarily and easily extendable.
At the moment variants up to 30 ply (half moves) deep can be inserted.
- the lines of variants do not have to be of same length

For details how to edit the opening books see history text or the documentation in the Books-W files. (It should be even possible now to create such a Zillions Chess Opening Book from any text-based chess opening book via an appropriate translation program!)

During the game, hit key F7 to see which moves the opening book offers you.

The opening book implementation works perfectly in a play human against human.
When a human plays against the computer, the computer tends to choose the same subset of the possible moves, and hence ignores some of the moves offered by the opening book. Therefore you as the human player may have to choose the opponent's book move (hit F7 first to see the options) if you want to use the full width of the opening book. (Implementing the opponent as a random player does not work, since once out of book we do not want the opponent to play random moves!)

For information on the buttons of the chess playing screen see associated game text.

 
TWO COLLECTIONS OF OPENING BOOKS:
There are two nearly identical collections of chess opening books in this Zillions game, one for the case that you play White and one for the case that you play Black (the directories are called 'Books-W' and 'Books-B').