Fruit (chess engine)
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225888514
2008-07-15T21:40:30Z
GregorB
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/* Derivatives */ Citation needed per comment on talk page
'''Fruit''' is a [[chess engine]] developed by Fabien Letouzey. In the [[Swedish Chess Computer Association|SSDF]] rating list released on [[November 24]] [[2006]], Fruit version 2.2.1 had a [[Elo rating system|rating]] of 2842. In the CEGT rating list released on [[January 24]] [[2007]], Fruit version 2.2.1 had a [[Elo rating system|rating]] of 2776.
At the [[World Computer Chess Championship]] in [[Reykjavík]] in 2005, Fruit scored 8.5 out of 11, finishing in second place behind [[Zappa (Chess engine)|Zappa]].
Until Version 2.1 (''Peach''), Fruit was an [[open source]] engine. The source of the version 2.1 is still open and contributed much to the development in computer chess in recent years. Some people still work on the old source code and have created variations from the original Fruit.
==Technical details of Fruit 2.1==
Fruit uses the classical [[Negascout]] (PVS) algorithm with [[Iterative deepening]] to traverse the game tree. It also uses the [[null-move heuristic]]. The original version used a simplistic [[evaluation function]] with a robust search. Later versions have improved evaluation functions.
The [[Board representation (chess)|board representation]] is distinct — Fruit uses a 16x16 board.
As of July 23, 2007, Fruit became freeware.
The latest version Fruit 2.3 and Fruit 2.3.1 are free to download on [http://www.superchessengine.com/fruit.htm superchessengine.com]
Fruit 2.3.1 is one of the top 3 free UCI Chess engines.
==Derivatives==
'''[http://www.superchessengine.com/toga_ii.htm Toga II]''' is a derivative created by Thomas Gaksch. It has more chess knowledge and perhaps a better search algorithm.{{fact}} It is based on Fruit 2.1 and is free.
'''[http://www.superchessengine.com/gambit_fruit.htm GambitFruit]''' is another free derivative of Fruit 2.1, created by Ryan Benitez. It plays a more aggressive style and has more chess knowledge.{{fact}} GambitFruit also incorporates improvements from Toga II.
==External links==
*[http://www.fruitchess.com Official Fruit Homepage]
*[http://www.superchessengine.com/fruit.htm Official Fruit 2.3.1]
*[http://arctrix.com/nas/fruit/ Fruit 2.1 source]
*[http://wbec-ridderkerk.nl/html/details/Fruit.html Official distribution web site (2.1 and below)]
*[http://www.superchessengine.com/toga_ii.htm Toga]
*[http://www.superchessengine.com/gambit_fruit.htm GambitFruit]
[[Category:2004 software]]
[[Category:Chess engines]]
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