This is the opening book of gnuchess. It used to be distributed together with gnuchess up to version 5.02. The Debian package was prepared by Lukas Geyer Upstream location of the book is ftp://ftp.gnu.org/pub/gnu/chess/book_1.02.pgn.gz This opening book is in the public domain. It was put together and cleaned up by Stuart Cracraft and Simon Waters . Stuart wrote the following in email, when asked about copyright. I personally built the GNU Chess book from a large set of FREE game collections from the University of Pittsburgh chess server. These are NOT copyrighted and are PUBLIC. I also wrote the code for the GNU Chess book without any reference at all to any other author. It is GNU Chess code and PUBLIC book that is non-copyrightable. --Stuart Note that all the code is in gnuchess, so this package itself is purely public domain. Lukas Geyer