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'''Betsy''',<br/
a [[WinBoard]] compatible chess engine by [[Landon W. Rabern]], written in [[C]] with a little [[Assembly]], released in September 2000 <ref>[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])</ref>.
Originally written in [[Pascal]] with its own [[CLI|text interface]] it was rewritten in C using [[Rotated Bitboards|rotated bitboards]]. Betsy applies [[Principal Variation Search|PVS]] with [[Null Move Pruning|null move pruning]], and various standard and some aggressive non-standard [[Extensions|extensions]] and [[Reductions|reductions]].
According to a former [[Arena]] site, Betsy was the first published chess engine able to play [[Chess960]]<ref>[https://chess-tigers.de/index_news.php?id=308&rubrik=4&PHPSESSID=d71dfe17e7e8aae16adce6f8fb284410 Der Chess960-Express ist nicht mehr aufzuhalten], [https://chess-tigers.de/cttc_main.php?rubrik=7 Chess Tigers Training Center], July 20, 2005 (German)</ref>, and was therefore Arena partner engine.
=Forum Posts=
==Chess Engine==
* [http://kirr.homeunix.org/chess/engines/Norbert%27s%20Collection/Betsy%20%5B-xboard%2032%5D%20%28Compilation%29/ Index of /chess/engines/Norbert's Collection/Betsy] by [[Norbert Raimund Leisner]], hosted by [[Kirill Kryukov]]
* [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]]
* [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]]
