Betsy
Betsy,
a WinBoard compatible chess engine by Landon Rabern, written in C with a little Assembly, released in September 2000 [2].
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 a former Arena site, Betsy was the first published chess engine able to play Chess960 [3], and was therefore Arena partner engine.
C#
As of 2014, Landon Rabern started to port Betsy to C#, available as open source engine under the MIT License at GitHub. All the major components of a chess engine are there, just not a tuned evaluation [4]. The board class embeds an 8x8 board and the Bitboard board-definition, and implements rotated bitboards. The search is implemented using a derivation chain of classes, the abstract base Brain, TranspositionTableBrain (Transposition Table, Iterative Deepening), and the concrete BasicAlphaBetaBrain (Alpha-Beta), NullMoveBrain (Null Move Pruning) and MTDfBrain (MTD(f)) classes.
Forum Posts
- Re: C or C++ for Chess Programming? by Landon Rabern, CCC, August 18, 2000
- Betsy 5.0 is now winboard compatable by Landon Rabern, CCC, September 06, 2000
- Betsy 5.26 by Landon Rabern, CCC, July 06, 2001
- Re: FRC_TheBaron_101 Vs Fritz8 (Castling vs Not Castling rules) by Landon Rabern, CCC, June 24, 2003
- Betsy in Arena by Mark Loftus, CCC, September 13, 2003
- Betsy 6.5.1 by Landon Rabern by Norbert Raimund Leisner, CCC, August 21, 2008
External Links
Chess Engine
- Index of /chess/engines/Norbert's Collection/Betsy by Norbert Raimund Leisner, hosted by Kirill Kryukov
- Betsy from WBEC Ridderkerk (Internet Archive)
- Betsy 6.51 Nobook in CCRL 40/2
- landon rabern - about
- Betsy Fischer in CCRL 40/4 FRC
- GitHub - landon/Chess: Beginnings of a port of Betsy to C#
Misc
- Betsy from Wikipedia
- Betsy (disambiguation) from Wikipedia
- Betsy (dog) from Wikipedia
- Hurricane Betsy from Wikipedia
- Tropical Storm Betsy (disambiguation) from Wikipedia
References
- ↑ 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
- ↑ Betsy from WBEC Ridderkerk (Internet Archive)
- ↑ Der Chess960-Express ist nicht mehr aufzuhalten, Chess Tigers Training Center, July 20, 2005 (German)
- ↑ GitHub - landon/Chess: Beginnings of a port of Betsy to C#
