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=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=
* [[Bookup]]
* [[Chess Opening Wizard]] (COW)
* [[BanksiaGUIBanksia GUI]]
=Quotes=
* [http://groups.google.com/group/gnu.chess/browse_frm/thread/329b9401059f679b gnuchess.book in Lisp] by [[Steven Edwards]], [[GNU Chess#NewsGroup|gnu.chess]], January 23, 1990
==1995 ...==
* [https://groups.google.com/d/msg/rec.games.chess.computer/twuuIKTUqRw/bCN6Jn9zGOcJ Opening taxonomy] by [[Hugh S. Myers]], [[Computer Chess Forums|rgcc]], September 12, 1995
* [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/656439670bd7c7fb The MCHESS5 computer killer book...] by [[Ed Schroder|Ed Schröder]], [[Computer Chess Forums|rgcc]], October 14, 1996
* [http://groups.google.com/group/rec.games.chess.computer/browse_frm/thread/f14614c6bdebff95 Killer Books] by [[Andreas Mader]], [[Computer Chess Forums|rgcc]], October 29, 1996
'''2019'''
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=70518 Book creation papers] by [[Robert Pope]], [[CCC]], April 18, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71386 Database snapshot] by [[Bojun Guo|noobpwnftw]], [[CCC]], July 27, 2019* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=71764 ChessDBCN] by [[Bojun Guo|noobpwnftw]], [[CCC]], September 09, 2019
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=72432 Polyglot FRC/960 Opening Book] by [[Dennis Sceviour]], [[CCC]], November 27, 2019 » [[PolyGlot]], [[Chess960]]
==2020 ...==
* [http://www.talkchess.com/forum3/viewtopic.php?f=7&t=75205 How many Elo points is a book?] by [[Chris Whittington]], [[CCC]], September 25, 2020 » [[Playing Strength]]
* [http://www.talkchess.com/forum3/viewtopic.php?f=2&t=75878 Chess opening database with names] by Peperoni, [[CCC]], November 20, 2020 » [[ECO]]
=External Links=
* [http://www.g-sei.org/wp-content/Users/Fauzi/fauzi.html Fauzi's Opening Books] by [[Fauzi Akram Dabat]], [[G 6]] site
==Online Opening Tree==
* [https://www.chessdb.cn/queryc_en/ Chess Cloud Database Query Interface] by [[Bojun Guo|noobpwnftw]]
* [https://database.chessbase.com/?lang=en/ Chess database with eight million games. Openings, players, tournaments - Online] - [[ChessBase (Database)|ChessBase]]
* [http://www.chessgames.com/perl/explorer Chess Opening Explorer] from [http://www.chessgames.com/index.html chessgames.com]
