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a WinBoard compatible chess engine written by Landon W. Rabern in C with a little Assembly, first released in September 2000 [1]. Originally written in Pascal with its own text interface it was rewritten in C using rotated bitboards. Betsy applies PVS with null move pruning, and various standard and some aggressive non-standard extensions and reductions. According to the Arena site, Betsy was the first published chess engine able to play Chess960, and is therefor Arena partner engine [2].
Hurricane Betsy [3]

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  1. ^ Betsy from WBEC Ridderkerk
  2. ^ Arena Chess GUI 3.5 - Betsy
  3. ^ Hurricane Betsy in the Gulf of Mexico in September of 1965 as taken by the TIROS-8 weather satellite. Source: NOAA Photo Library, September 4, 1965

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