585
edits
Changes
→Purposes
=Purposes=
* Save time: Chess programs could use [[Search|search]] from the beginning and look through all possible continuations in detail to find the best next move, but as this is quite time-consuming and there already exists a lot of [https://en.wikipedia.org/wiki/Chess_opening_book_%28literature%29 literature] about different opening lines, opening books save time.
* Provide a higher quality of play: Searching only even with large depths can't see deep tactics and , strategy, compensation, lose temporarily material for long term advantage.
* Provide variety: as book moves are usually chosen [[Pseudorandom Number Generator|randomly]], whereas searches are more or less deterministic.
=Types=
