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ECO
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* [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]]
