Install gnuchess-book by entering the following commands in the terminal:
sudo apt update sudo apt install gnuchess-book
Description:
Opening book for gnuchess
This is the opening book for gnuchess. It was formerly distributed together with gnuchess, now it has been separated due to size and architecture-independence. It is recommended that you install it if you want to use gnuchess.
Homepage: http://www.gnu.org/software/chess/
Version: 1.02-2
Section: universe/games