25,161
edits
Changes
no edit summary
'''[[Main Page|Home]] * [[Engines]] * Betsy'''
[[FILE:Hurricane Betsy.jpg|border|right|thumb|240px| Hurricane Betsy <ref>[https://en.wikipedia.org/wiki/Hurricane_Betsy Hurricane Betsy] in the [https://en.wikipedia.org/wiki/Gulf_of_Mexico Gulf of Mexico] in September of 1965 as taken by the [https://en.wikipedia.org/wiki/Television_Infrared_Observation_Satellite TIROS-8] weather satellite. Source: [https://en.wikipedia.org/wiki/National_Oceanic_and_Atmospheric_Administration NOAA] [http://www.photolib.noaa.gov/ Photo Library], September 4, 1965</ref> ]]
'''Betsy''',<br/>
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.
=C#=
As of 2014, Landon Rabern started to port Betsy to [[C sharp|C#]], available as [[:Category:Open Source|open source engine]] under the [[Massachusetts Institute of Technology#License|MIT License]] at [https://en.wikipedia.org/wiki/GitHub GitHub].
All the major components of a chess engine are there, just not a tuned [[Evaluation|evaluation]] <ref>[https://github.com/landon/Chess GitHub - landon/Chess: Beginnings of a port of Betsy to C#]</ref>.
The board class embeds an [[8x8 Board|8x8 board]] and the [[Bitboard Board-Definition|Bitboard board-definition]], and implements [[Rotated Bitboards|rotated bitboards]].
The [[Search|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=
* [https://www.stmintz.com/ccc/index.php?id=125117 Re: C or C++ for Chess Programming?] by [[Landon Rabern]], [[CCC]], August 18, 2000
* [https://www.stmintz.com/ccc/index.php?id=128512 Betsy 5.0 is now winboard compatable] by [[Landon Rabern]], [[CCC]], September 06, 2000
* [https://www.stmintz.com/ccc/index.php?id=178491 Betsy 5.26] by [[Landon Rabern]], [[CCC]], July 06, 2001
* [https://www.stmintz.com/ccc/index.php?id=302797 Re: FRC_TheBaron_101 Vs Fritz8 (Castling vs Not Castling rules)] by [[Landon Rabern]], [[CCC]], June 24, 2003
* [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
* [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]]
* [https://github.com/landon/Chess GitHub - landon/Chess: Beginnings of a port of Betsy to C#]
==Misc==
* [https://en.wikipedia.org/wiki/Betsy Betsy from Wikipedia]
<references />
'''[[Engines|Up one Level]]'''
[[Category:Open Source]]
[[Category:C sharp]]
[[Category:WinBoard]]
[[Category:Chess960]]
