/usr/share/doc/gnuchess-book/README.Debian is in gnuchess-book 1.02-2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | gnuchess-book - Opening book for gnuchess
The opening book has been split from the binary gnuchess package. The
format of the binary book is now entirely architecture independent and
not bound to change with every new version of gnuchess. If you want to
build your own books, just create it from PGN [1] by calling gnuchess
and entering 'book add foobar.pgn'. If you want to use this as the
default opening book, copy the resulting book.bin file to
/usr/share/games/gnuchess/book.bin. If you only want to use your own book
temporarily, put it in the current working directory, this is the first
default location where gnuchess looks for the book.
Lukas Geyer <lukas@debian.org> Wed Oct 9 19:02:54 EDT 2002
[1] Actually, you have to use a sort of restricted PGN, as gnuchess does
not yet have a real PGN parser. This means in particular that the PGN
should have no comments and variations. Also gnuchess does only add
games to the opening book if it knows one of the players, i.e. it checks
the names of the players against a hardcoded list of grandmasters.
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