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=Sample Implementation=
The book identification code of the [[Opening Book|opening book]] in [[IsiChess]] (commercial [[MS-DOS|DOS]] version) had all book lines defined in a [[Portable Game Notation|PGN]]-like textfile with a descriptive name and ECO code associated, much more than the 500 determinative ECO lines and full of transpositions, merged into an opening tree similar to a persistent [[Transposition Table|transposition table]] indexed by the [[Zobrist Hashing|Zobrist key]], keeping not only a list of possible moves from the current position, but also a list of different predecessor moves aka indices to the different opening lines. Its [[IsiChess#Book Editor|book editor ]] has not only an opening tree view, but also a list view of opening lines where multiple lines with different last moves and possibly ECO codes may appear, leading to the current position. [[FILE:IsiChessBook.jpg|none|border|text-bottom]]
=See also=
* [https://www.chessgames.com/chessecohelp.html ECO Listing - chessgames.com]
* [https://web.archive.org/web/20180821064736/http://www.playwitharena.com/?User_Files%2C_Engines:ECO_Opening_Classification_%2811%29 ECO Opening Classification (11)] from [[Arena|Arena Chess GUI]] developed by [[Christopher Conkie]] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine])
* [https://www.cs.kent.ac.uk/~djb/pgn-extract/eco.pgn eco.pgn] from [https://www.cs.kent.ac.uk/people/staff/djb/pgn-extract/ pgn-extract] by [[David J. Barnes]] » [[pgn-extract]]
* [https://raw.githubusercontent.com/BookOwl/scid-vs-pc/master/scid.eco Encyclopaedia of Chess Openings file] for [[Scid vs. PC]]
* [https://github.com/jdart1/arasan-chess/blob/master/book/eco arasan-chess/book/eco at master · jdart1/arasan-chess · GitHub] by [[Jon Dart]]
