For beginning - intermediate chess players, or those who want to learn it,
and then it's dealing only with the specialty called opening theory. No e-pub version (yet).
(The only book at this level, as far as i know, with selected B & W variations for beginners via the 'repertoire' method ; also a rare book with diagrams with Black at the bottom, when it is Blacks move to play(*); thereby a high amount of - colored- diagrams to be an ideal learning tool.) NB planning to release a printed book (paper) version before the end of the year (2014), possibly via Ingram Spark, but if there is any (Chess-)publisher having interest, then they can contact me. Probably both a color version (expensive) and a B&W version (cheap) are f…
Recently made an update of the Bookbuilder program (4.2)
Now more than 900 thousand position in the default book.
It now gives a reasonable accurate overview of the 'best'
opening variations or defenses , after 1.d4! 1.e4 or 1.Nf3.
Add variation name possible again (it had disappeared
in the previous version).
The 'demo' version on shareit.com is a fully functional
version, working for 14 days.
PS nowadays playing with the Stockfish engine on ICC,
with a 17Mb book made for the Chesspartner interface.