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'''[[Main Page|Home]] * [[Engines]] * Aristarch'''
[[FILE:Aristarchos von Samos (Denkmal).jpeg|border|right| [[Mathematician#Aristarch|Aristarchus of Samos]] <ref>[https://en.wikipedia.org/wiki/Aristarchus_of_Samos Aristarchos] of [https://en.wikipedia.org/wiki/Samos Samos], monument at [https://en.wikipedia.org/wiki/Aristotle_University_of_Thessaloniki Aristotle University of Thessaloniki], Photo by [https://de.wikipedia.org/wiki/Benutzer:Dr._Manuel Dr. Manuel], [https://en.wikipedia.org/wiki/Aristarchus_of_Samos Aristarchos von Samos from Wikipedia]</ref> ]]
'''Aristarch''',<br/>
a chess engine by [[Stefan Zipproth]], compliant to the [[Chess Engine Communication Protocol]] as well as the [[UCI|Universal Chess Interface]], running under [[Windows]].
The development of Aristarch already started in 1995 and was first written in [[Basic]], version 2 was mainly a [[C]] port, but version 3 was a complete rewrite in [[Cpp|C++]],
using a strictly [https://en.wikipedia.org/wiki/Object-oriented_programming object oriented] design, utilizing [[Bitboards|bitboards]] to represent the board,
and apparently [[Rotated Bitboards|rotated bitboards]] to generate [[Sliding Piece Attacks|sliding piece attacks]].
Version 4.0 includes several improvements, the most important being a completely new [[Pawn Structure|pawn evaluation]] routine <ref>[https://zipproth.com/chess/aristarch/ About Aristarch]</ref>,
it otherwise has a rather speculative [[King Safety|king safety]] evaluation.
Beside commonly known search [[Extensions|extensions]] and [[Reductions|reductions]], Version 4.21 introduced an original [[Pruning|pruning]] method based on 8 simple conditions <ref>[https://zipproth.com/chess/inside-aristarch/ Inside Aristarch]</ref>. Aristarch played the [[CCT4]] and [[CCT5]] [[CCT Tournaments|online tournaments]].
=Etymology=
The name of the engine has its origin in the [https://en.wikipedia.org/wiki/Ancient_Greece ancient Greek] [https://en.wikipedia.org/wiki/Astronomer astronomer] and [[Mathematician]] [[Mathematician#Aristarch|Aristarchus of Samos]] (310 BCE - ca. 230 BCE) <ref>[https://zipproth.com/chess/aristarch/ About Aristarch]</ref>,
who presented the first known model of [https://en.wikipedia.org/wiki/Heliocentrism Heliocentrism] that placed the [https://en.wikipedia.org/wiki/Sun Sun] at the center of the known [https://en.wikipedia.org/wiki/Universe universe] with the [https://en.wikipedia.org/wiki/Earth Earth] revolving around it.
He calculated the [https://en.wikipedia.org/wiki/On_the_Sizes_and_Distances_%28Aristarchus%29 sizes of the Sun and Moon], as well as their distances from the Earth in terms of Earth's radius.
=See also=
* [[List (Program)|List]]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=244092 Exiciting Aristarch] by [[Sune Larsson]], [[CCC]], August 05, 2002
* [https://www.stmintz.com/ccc/index.php?id=244431 Re: To Stefan Zipproth (Aristarch)] by [[Stefan Zipproth]], [[CCC]], August 07, 2002
* [https://www.stmintz.com/ccc/index.php?id=244995 Amateur vs Prof: Aristarch 4.4 vs Nimzo 7.32 (2)] by [[Kurt Utzinger]], [[CCC]], August 10, 2002
* [https://www.stmintz.com/ccc/index.php?id=245277 Re: who is Aristarch ?] by [[John Merlino]], [[CCC]], August 12, 2002
* [https://www.stmintz.com/ccc/index.php?id=245691 Amateurs vs Professionals (Aristarch 4.4 vs Nimzo 7.32) 7,0-14,0] by [[Kurt Utzinger]], [[CCC]], August 16, 2002
* [https://www.stmintz.com/ccc/index.php?id=345007 List 512 UCI und Aristarch 4.37 ready for Download] by Andreas Aicher, [[CCC]], January 26, 2004
* [http://www.talkchess.com/forum/viewtopic.php?t=20787 Nice win from Aristarch 4.50] by [[Graham Banks]], [[CCC]], April 21, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=36905 A New Version Of Aristarch] by David Schumaker, [[CCC]], December 02, 2010
=External Links=
==Chess Engine==
* [https://zipproth.com/chess/ Chess engines... Aristarch, List]
** [https://zipproth.com/chess/aristarch/ About Aristarch]
** [https://zipproth.com/chess/inside-aristarch/ Inside Aristarch]
==Misc==
* [https://en.wiktionary.org/wiki/Aristarch Aristarch - Wiktionary]
* [https://en.wikipedia.org/wiki/Aristarchus Aristarchus (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Aristarchus_of_Samos Aristarchus of Samos from Wikipedia]
: [https://en.wikipedia.org/wiki/On_the_Sizes_and_Distances_%28Aristarchus%29 On the Sizes and Distances (Aristarchus) from Wikipedia]
* [https://en.wikipedia.org/wiki/Aristarchus_of_Samothrace Aristarchus of Samothrace]
* [https://en.wikipedia.org/wiki/Aristarchus_%28crater%29 Aristarchus (crater) from Wikipedia]
* [https://en.wikipedia.org/wiki/3999_Aristarchus 3999 Aristarchus from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:WinBoard]]
[[Category:XBoard]]
[[Category:UCI]]
[[Category:X86]]
[[Category:X64]]
[[Category:PC]]
[[Category:Windows]]
[[Category:Astronomy]]
[[FILE:Aristarchos von Samos (Denkmal).jpeg|border|right| [[Mathematician#Aristarch|Aristarchus of Samos]] <ref>[https://en.wikipedia.org/wiki/Aristarchus_of_Samos Aristarchos] of [https://en.wikipedia.org/wiki/Samos Samos], monument at [https://en.wikipedia.org/wiki/Aristotle_University_of_Thessaloniki Aristotle University of Thessaloniki], Photo by [https://de.wikipedia.org/wiki/Benutzer:Dr._Manuel Dr. Manuel], [https://en.wikipedia.org/wiki/Aristarchus_of_Samos Aristarchos von Samos from Wikipedia]</ref> ]]
'''Aristarch''',<br/>
a chess engine by [[Stefan Zipproth]], compliant to the [[Chess Engine Communication Protocol]] as well as the [[UCI|Universal Chess Interface]], running under [[Windows]].
The development of Aristarch already started in 1995 and was first written in [[Basic]], version 2 was mainly a [[C]] port, but version 3 was a complete rewrite in [[Cpp|C++]],
using a strictly [https://en.wikipedia.org/wiki/Object-oriented_programming object oriented] design, utilizing [[Bitboards|bitboards]] to represent the board,
and apparently [[Rotated Bitboards|rotated bitboards]] to generate [[Sliding Piece Attacks|sliding piece attacks]].
Version 4.0 includes several improvements, the most important being a completely new [[Pawn Structure|pawn evaluation]] routine <ref>[https://zipproth.com/chess/aristarch/ About Aristarch]</ref>,
it otherwise has a rather speculative [[King Safety|king safety]] evaluation.
Beside commonly known search [[Extensions|extensions]] and [[Reductions|reductions]], Version 4.21 introduced an original [[Pruning|pruning]] method based on 8 simple conditions <ref>[https://zipproth.com/chess/inside-aristarch/ Inside Aristarch]</ref>. Aristarch played the [[CCT4]] and [[CCT5]] [[CCT Tournaments|online tournaments]].
=Etymology=
The name of the engine has its origin in the [https://en.wikipedia.org/wiki/Ancient_Greece ancient Greek] [https://en.wikipedia.org/wiki/Astronomer astronomer] and [[Mathematician]] [[Mathematician#Aristarch|Aristarchus of Samos]] (310 BCE - ca. 230 BCE) <ref>[https://zipproth.com/chess/aristarch/ About Aristarch]</ref>,
who presented the first known model of [https://en.wikipedia.org/wiki/Heliocentrism Heliocentrism] that placed the [https://en.wikipedia.org/wiki/Sun Sun] at the center of the known [https://en.wikipedia.org/wiki/Universe universe] with the [https://en.wikipedia.org/wiki/Earth Earth] revolving around it.
He calculated the [https://en.wikipedia.org/wiki/On_the_Sizes_and_Distances_%28Aristarchus%29 sizes of the Sun and Moon], as well as their distances from the Earth in terms of Earth's radius.
=See also=
* [[List (Program)|List]]
=Forum Posts=
* [https://www.stmintz.com/ccc/index.php?id=244092 Exiciting Aristarch] by [[Sune Larsson]], [[CCC]], August 05, 2002
* [https://www.stmintz.com/ccc/index.php?id=244431 Re: To Stefan Zipproth (Aristarch)] by [[Stefan Zipproth]], [[CCC]], August 07, 2002
* [https://www.stmintz.com/ccc/index.php?id=244995 Amateur vs Prof: Aristarch 4.4 vs Nimzo 7.32 (2)] by [[Kurt Utzinger]], [[CCC]], August 10, 2002
* [https://www.stmintz.com/ccc/index.php?id=245277 Re: who is Aristarch ?] by [[John Merlino]], [[CCC]], August 12, 2002
* [https://www.stmintz.com/ccc/index.php?id=245691 Amateurs vs Professionals (Aristarch 4.4 vs Nimzo 7.32) 7,0-14,0] by [[Kurt Utzinger]], [[CCC]], August 16, 2002
* [https://www.stmintz.com/ccc/index.php?id=345007 List 512 UCI und Aristarch 4.37 ready for Download] by Andreas Aicher, [[CCC]], January 26, 2004
* [http://www.talkchess.com/forum/viewtopic.php?t=20787 Nice win from Aristarch 4.50] by [[Graham Banks]], [[CCC]], April 21, 2008
* [http://www.talkchess.com/forum/viewtopic.php?t=36905 A New Version Of Aristarch] by David Schumaker, [[CCC]], December 02, 2010
=External Links=
==Chess Engine==
* [https://zipproth.com/chess/ Chess engines... Aristarch, List]
** [https://zipproth.com/chess/aristarch/ About Aristarch]
** [https://zipproth.com/chess/inside-aristarch/ Inside Aristarch]
==Misc==
* [https://en.wiktionary.org/wiki/Aristarch Aristarch - Wiktionary]
* [https://en.wikipedia.org/wiki/Aristarchus Aristarchus (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Aristarchus_of_Samos Aristarchus of Samos from Wikipedia]
: [https://en.wikipedia.org/wiki/On_the_Sizes_and_Distances_%28Aristarchus%29 On the Sizes and Distances (Aristarchus) from Wikipedia]
* [https://en.wikipedia.org/wiki/Aristarchus_of_Samothrace Aristarchus of Samothrace]
* [https://en.wikipedia.org/wiki/Aristarchus_%28crater%29 Aristarchus (crater) from Wikipedia]
* [https://en.wikipedia.org/wiki/3999_Aristarchus 3999 Aristarchus from Wikipedia]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:WinBoard]]
[[Category:XBoard]]
[[Category:UCI]]
[[Category:X86]]
[[Category:X64]]
[[Category:PC]]
[[Category:Windows]]
[[Category:Astronomy]]
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