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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=
* [https://www.stmintz.com/ccc/index.php?id=128512 Betsy 5.0 is now winboard compatable] by [[Landon W. Rabern]], [[CCC]], September 06, 2000* [https://www.stmintz.com/ccc/index.php?id=178491 Betsy 5.26] by [[Landon W. Rabern]], [[CCC]], July 06, 2001
* [https://www.stmintz.com/ccc/index.php?id=315727 Betsy in Arena] by Mark Loftus, [[CCC]], September 13, 2003
* [http://www.talkchess.com/forum/viewtopic.php?t=23156 Betsy 6.5.1 by Landon Rabern] by [[Norbert Raimund Leisner]], [[CCC]], August 21, 2008
