opening book

 

English Wikipedia has an article on:

Chess opening book

Wikipedia

 

English Wikipedia has an article on:

Chess opening book (computers)

Wikipedia

opening book (plural opening books)

1. (chess, literally) A book describing chess openings or giving general opening advice.
2. (chess engines) A database of openings given to a chess engine to play, either to improve the strength of the engine, to make the engine more interesting to play against, or to create a diversity of games in a chess engine tournament.