Cheiron

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|| [[image:180px-Chiron_instructs_young_Achilles_-_Ancient_Roman_fresco.jpg link="http://en.wikipedia.org/wiki/Chiron"]] ||~   || **Cheiron**,
a computer chess program written by [[Ulf Lorenz]]. It played the [[WCCC 1995|8th World Computer Chess Championship 1995]] in Shatin, Hong Kong and the [[WMCCC 1995|13th World Microcomputer Chess Championship 1995]] in Paderborn, and the [[IPCCC 1994]] and [[IPCCC 1997]]. ||
|| [[http://en.wikipedia.org/wiki/Chiron|Chiron]] and [[http://en.wikipedia.org/wiki/Achilles|Achilles]] <ref>[[http://en.wikipedia.org/wiki/Chiron|Chiron from Wikipedia]]</ref> ||~   ||^   ||
[[toc]]
=Description= 
from the [[ICGA]]-site <ref>[[http://www.game-ai-forum.org/icga-tournaments/program.php?id=188|Cheiron's ICGA Tournaments]]</ref>:
|| {{In [[http://en.wikipedia.org/wiki/Greek_mythology|Greek mythology]], [[http://en.wikipedia.org/wiki/Chiron|Cheiron]] was the wisest of all [[http://en.wikipedia.org/wiki/Centaur|centaurs]] and the teacher of many heroes. The program Cheiron is written in [[C]]. It is an [[Alpha-Beta|alpha-beta]] program using most of the known state-of-the-art heuristics including [[Killer Heuristic|killer heuristics]], [[Transposition Table|transposition table]], [[Aspiration Windows|aspiration search]], plausible [[Move Ordering|move ordering]], [[Iterative Deepening|iterative deepening]], selective deepening etc. [[Null Move Pruning|Null moves]], however, are not used. The [[Quiescence Search|quiescence search]] is quite large and examines some tactical motifs, particularly mating and promotion threats.}} ||

|| {{Apart from the [[Move Generation|move generator]], the [[Evaluation function|evaluation function]] is the most expensive part of the program. It examines the [[Pawn Structure|pawn structure]], [[King Safety|king's security]], static positions of the pieces, everlasting knights etc. as well as special situations in the endgame (e.g. there are positions when two pawns are more worth than a rook).}} ||

|| {{On a [[http://en.wikipedia.org/wiki/Pentium|Pentium]] 90MHz the program will search about 10.000 [[Nodes per second|nodes per second]]. Cheiron is more a positional playing than a tactical playing program. Cheiron uses an [[Opening Book|opening book]] containing about 12,000 positions to get a good start into the game. Using the [[BT-Test|Bednorz-Toennissen test]], Cheiron has an estimated rating of 2100 ELO on a 50MHz [[IBM PC|PC]]. Tournament results against humans supports this number. Originally, the program was developed for [[Unix]] boxes, but a version has been developed with a [[GUI|graphical interface]] using [[C|Turbo C]] in a [[MS-DOS|DOS]]-[[Windows|Windows 3.1]] environment.}} ||

=See also=
* [[Achilles]]
* [[Centaur]]
* [[Chiron]]
* [[Various Classifications#Mythology|Mythology]]

=External Links=
==Chess Program==
* [[http://www.game-ai-forum.org/icga-tournaments/program.php?id=188|Cheiron's ICGA Tournaments]]
==Misc==
* [[http://en.wikipedia.org/wiki/Chiron|Chiron (Mythology) from Wikipedia]]

=References= 
<references />
=What links here?= 
[[include page="Cheiron" component="backlinks" limit="40" ]]
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