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Hydra

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=System Hydra=
[[FILE:SystemHydra.png|none|border|text-bottom|580px|link=https://de.wikipedia.org/wiki/Hydra_(Schachcomputer)]]
System architecture of Hydra <ref>[https://de.wikipedia.org/wiki/Hydra_(Schachcomputer) Hydra (Schachcomputer) – Wikipedia.de] (German)</ref>ran on a [https://en.wikipedia.org/wiki/Myrinet Myrinet] interconnected [[Linux]] [https://en.wikipedia.org/wiki/Computer_cluster cluster] of four (later eight) dual [[IBM PC|PC]] server nodes able to handle two [https://en.wikipedia.org/wiki/Conventional_PCI PCI] buses, which are conneced to a FPGA card each, simultaneously. The [[Parallel Search|distributed search]] algorithm ran on the [[x86]] nodes as [https://en.wikipedia.org/wiki/Message_Passing_Interface MPI] [[Process|processes]], where the last three [[Ply|plies]] of an n-ply search including [[Quiescence Search|quiescence]] and all [[Evaluation|evaluations]] are delegated to the FPGA card, typically 100.000 times per second and processor. For further information see the [[Brutus#Description|description]] of [[Brutus]].
=Team Hydra=
* [[Peter Vossen]] ('''2007'''). ''Computer-WM Amsterdam''. [[Computerschach und Spiele|Computerschach und Spiele Online]], [http://computerschach.de/Files/2007/Computer-WM%20Amsterdam%20%281%29.pdf pdf1] <ref>[http://computerschach.de/Files/2007/Computer-WM%20Amsterdam%20%281%29.pdf Part 1] has an interview with [[Chrilly Donninger]] about [[Hydra]]</ref>
* [[Chrilly Donninger]] ('''2007'''). ''Flugstunden mit Ken Thompson''. [https://brigitte-godot.com/wp-content/uploads/2018/03/Flugstunden.pdf pdf] (German)
* [[Ulf Lorenz]], [[Chrilly Donninger|Christian Donninger]], [[Mohammed Nasir Ali|Muhammad N. Ali]], [[Erdogan Günes]], [[Christopher Lutz]] ('''2020'''). ''Hydra: Report and technical overview''. [[ICGA Journal#42_23|ICGA Journal, Vol. 42, Nos. 2-3]]
=Forum Posts=
==Chess Entity==
* [https://en.wikipedia.org/wiki/Hydra_%28chess%29 Hydra (chess) from Wikipedia]
* [https://web.archive.org/web/20080518105542/http://www.hydrachess.com/ Hydrachess.com] ([https://en.wikipedia.org/wiki/Wayback_Machine Wayback Machine], May 18, 2008)
* [http://www.chessgames.com/perl/chessplayer?pid=87303 Games at chessgames.com]
* [https://www.donau-uni.ac.at/en/aktuell/news/archiv/02436/index.php From Brutus to Hydra - The mathematician Donninger about the evolution of his chess program], [https://en.wikipedia.org/wiki/Danube_University_Krems Danube University Krems], January 19, 2004
* [https://en.chessbase.com/post/nine-headed-monster-wins-paderborn Nine-headed monster wins Paderborn], [[ChessBase|ChessBase News]], February 15, 2004
* [https://en.chessbase.com/post/hydra-shocks-shredder-with-2-0-lead Hydra shocks Shredder with 2-0 lead], [[ChessBase|ChessBase News]], August 16, 2004
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