Fruit (software)
Fruit is a system developed by the French programmer Fabien Letouzey chess program. The first version dates from March 2004. Up to version 2.1, the program was developed as open source software. Since version 2.2, the development was not open source, the source code of the last free version is, however, still available on the internet. Between September 2005 and July 2007, the program was sold commercially. Meanwhile, it is no longer being developed and is freeware. The last developed by Fabien Letouzey version is a beta version of 3 November 2005, the current version (Fruit 2.3 ) comes from Ryan Benitez. When Fruit is a chess engine, so to play additionally a user interface as needed, for example Arena. The program uses for the UCI protocol to communicate with the chess frontend. Due to the free availability of version 2.1 of Fruit some derived engines have emerged, such as Toga II, Gambit Fruit and grapefruit.
Skill level and achievements
When WBEC Ridderkerk Edition 10 ( Winboard Chess Engine Competition), a large automated comparison tournament for chess programs, reached the version 2.0 of Fruit in the Premier Division, the highest performance group, the 14th place of 24 programs and is therefore in the WBEC Ridderkerk ranking also 14th place with a rating of 2.631. An equally impressive result achieved the version 2.1 in July 2005 when a test is run as part of the CSS ranking of the magazine " Computer Chess and Games ". The program has been improved in this list compared to the previous version 2.0 to 95 Elo points to a rating of 2747. Thus, the attested at this time only a little over a year old program in second place on the CSS rankings and was thus also against all commercial programs with the exception of Shredder Version 9 of the 24 games lost Fruit 2.1 merely two.
At the World Championships in computer chess in 2005 in Reykjavík Fruit finished 2.1 behind Zappa also took second place and was thus Shredder in this tournament behind. It might be doing next to Shredder and Deep Junior, winning against the two highly favored commercial programs. Fruit lost in this tournament only to eventual winners Zappa and the program Diep, which reached the seventh place. The very good performance of Fruit was also surprising because Fruit unlike the other top programs like Zappa, Shredder and Deep Junior played on a machine with only one processor, since it was not multi-processor support at this time. Since version 2.2.1, which reached the second place in the CSS rankings again in November 2005, the program can also access endgame databases. In February 2006 2.2.1 Fruit stand on the first place of the ranking of the Swedish Chess Computer Association SSDF.
Independent developments
The source code of version 2.1 was used by some developers as a basis for an independent development. These derived from Fruit Engines includes, for example Toga II of the German programmer Thomas Gaksch. Another engine based on Fruit 2.1, in which in addition also extensions of Toga II were integrated, is Gambit Fruit by the American Ryan Benitez. GNU Chess is based also been published in the April 2011 Version 6 on Fruit 2.1.
In March 2014, a fork of version 2.1 under the name Fruit Reloaded was released.
Ports of Fruit 2.1, Toga II and Gambit Fruit are also available for Personal Digital Assistants ( PDA) based on Palm OS 5 version is available, provided they are equipped with an ARM processor. As a user interface it is the free Palm program OpenChess. From Toga II also exists a port for mobile devices with the Android operating system and the free program Chess for Android as a user interface. Moreover, Fruit 2.1, Toga II and Gambit Fruit pbchess are using the paid program for e -book reader the Kindle brands, Kobo and PocketBook available.