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* [https://web.archive.org/web/20131109133342/http://wbec-ridderkerk.nl/html/details1/Betsy.html Betsy] from [[WBEC|WBEC Ridderkerk]] ([https://en.wikipedia.org/wiki/Internet_Archive Internet Archive])
* [http://www.computerchess.org.uk/ccrl/404/cgi/engine_details.cgi?print=Details&eng=Betsy%206.51%20Nobook Betsy 6.51 Nobook] in [[CCRL|CCRL 40/2]]
* [https://landon.github.io/#about landon rabern - about]
* [http://www.computerchess.org.uk/ccrl/404FRC/cgi/engine_details.cgi?print=Details&eng=Betsy%20Fischer#Betsy_Fischer Betsy Fischer] in [[CCRL|CCRL 40/4 FRC]]
* [https://github.com/landon/Chess GitHub - landon/Chess: Beginnings of a port of Betsy to C#]
