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Created page with "'''Home * Engines * Cheiron''' FILE:Chiron instructs young Achilles - Ancient Roman fresco.jpg|border|right|thumb|240px| [https://de.wikipedia.org/wiki/Ch..."
'''[[Main Page|Home]] * [[Engines]] * Cheiron'''
[[FILE:Chiron instructs young Achilles - Ancient Roman fresco.jpg|border|right|thumb|240px| [https://de.wikipedia.org/wiki/Cheiron Cheiron] and [https://en.wikipedia.org/wiki/Achilles Achilles] <ref>The [https://en.wikipedia.org/wiki/Fresco fresco] shows the [https://en.wikipedia.org/wiki/Centaur centaur] [https://en.wikipedia.org/wiki/Chiron Chiron Chiron], pedagogue of [https://en.wikipedia.org/wiki/Achilles Achilles], who teaches the still young man the use of the [https://en.wikipedia.org/wiki/Cithara cithara]. The prototype for this fresco was not another painting but a statue that [https://en.wikipedia.org/wiki/Pliny_the_Elder Pliny the Elder] remembered was exhibited in [https://en.wikipedia.org/wiki/Rome Rome] in [https://en.wikipedia.org/wiki/Saepta_Julia Saepta Julia]. [https://en.wikipedia.org/wiki/National_Archaeological_Museum,_Naples National Archaeological Museum, Naples (inv. Nr. 9109)], from [https://en.wikipedia.org/wiki/Herculaneum Herculaneum], [https://en.wikipedia.org/wiki/Augusteum Augusteum] - [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Cheiron''',<br/>
a chess program by [[Ulf Lorenz]]. [https://de.wikipedia.org/wiki/Cheiron Cheiron] is the German spelling of [https://en.wikipedia.org/wiki/Chiron Chiron], a [https://en.wikipedia.org/wiki/Centaur centaur] creature of the [https://en.wikipedia.org/wiki/Greek_mythology Greek mythology]. The program played the [[WCCC 1995|8th World Computer Chess Championship 1995]] in [https://en.wikipedia.org/wiki/Sha_Tin Shatin], [https://en.wikipedia.org/wiki/Hong_Kong Hong Kong] and the [[WMCCC 1995|13th World Microcomputer Chess Championship 1995]] in [https://en.wikipedia.org/wiki/Paderborn Paderborn], as well the [[IPCCC 1994]] and [[IPCCC 1997]].
=Description=
from the [[ICGA]]-site <ref>[https://www.game-ai-forum.org/icga-tournaments/program.php?id=188 Cheiron's ICGA Tournaments]</ref>:
In [https://en.wikipedia.org/wiki/Greek_mythology Greek mythology], [https://en.wikipedia.org/wiki/Chiron Cheiron] was the wisest of all [https://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]], [[Extensions|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 [[Checkmate|mating]] and [[Promotions|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, [[Outposts|everlasting knights]] etc. as well as special situations in the [[Endgame|endgame]] (e.g. there are positions when two pawns are more worth than a rook).
On a [[x86|Pentium]] 90MHz the program will search about 10,000 [[Nodes per Second|nodes per second]]. Cheiron is more a [[Strategy|positional]] playing than a [[Tactics|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.
=Selected Games=
[[WCCC 1995]], round 1, [[Gandalf]] - [[Cheiron]] <ref>[https://www.game-ai-forum.org/icga-tournaments/round.php?tournament=29&round=1&id=5 Shatin 1995 - Chess - Round 1 - Game 5 (ICGA Tournaments)]</ref>
<pre>
[Event "WCCC 1995"]
[Site "Shatin, Hong Kong"]
[Date "1995.05.25"]
[Round "1"]
[White "Gandalf"]
[Black "Cheiron"]
[Result "0-1"]
1.e4 e6 2.d4 c5 3.Nf3 cxd4 4.Nxd4 Nf6 5.Bd3 Be7 6.O-O Nc6 7.Be3 O-O 8.Nc3 d6 9.Nxc6 bxc6 10.f3 d5
11.e5 d4 12.exf6 Bxf6 13.Bxd4 Qxd4+ 14.Kh1 Rb8 15.Rb1 Rd8 16.Qe2 Bb7 17.a3 Be5 18.Rfe1 Bc7 19.Qe4
Qxe4 20.Nxe4 Rd5 21.g3 c5 22.Kg2 Rbd8 23.h3 Bb6 24.b3 Rd4 25.Re3 R4d7 26.Re2 Rd5 27.Bc4 Rd1 28.Rxd1
Rxd1 29.h4 g6 30.Kf2 Kf8 31.Re1 Rxe1 32.Kxe1 Ke7 33.g4 f5 34.Ng5 h6 35.Nxe6 Bxf3 36.gxf5 gxf5 37.c3
Kd6 38.Kd2 Bd5 39.Bxd5 Kxd5 40.Nf4+ Ke4 41.Nd3 f4 42.h5 c4 43.bxc4 Be3+ 44.Kc2 f3 45.a4 f2 46.Nxf2+
Bxf2 47.a5 0-1
</pre>
=See also=
* [[Achilles]]
* [[Centaur]]
* [[Chiron]]
=External Links=
==Chess Program==
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=188 Cheiron's ICGA Tournaments]
==Misc==
* [https://de.wikipedia.org/wiki/Cheiron Cheiron – Wikipedia.de] (German)
* [https://en.wikipedia.org/wiki/Chiron_(disambiguation) Chiron (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Chiron Chiron from Wikipedia]
* [https://commons.wikimedia.org/wiki/Category:Chiron?uselang=en Category:Chiron - Wikimedia Commons]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:Mythology]]
[[Category:DosEngine]]
[[FILE:Chiron instructs young Achilles - Ancient Roman fresco.jpg|border|right|thumb|240px| [https://de.wikipedia.org/wiki/Cheiron Cheiron] and [https://en.wikipedia.org/wiki/Achilles Achilles] <ref>The [https://en.wikipedia.org/wiki/Fresco fresco] shows the [https://en.wikipedia.org/wiki/Centaur centaur] [https://en.wikipedia.org/wiki/Chiron Chiron Chiron], pedagogue of [https://en.wikipedia.org/wiki/Achilles Achilles], who teaches the still young man the use of the [https://en.wikipedia.org/wiki/Cithara cithara]. The prototype for this fresco was not another painting but a statue that [https://en.wikipedia.org/wiki/Pliny_the_Elder Pliny the Elder] remembered was exhibited in [https://en.wikipedia.org/wiki/Rome Rome] in [https://en.wikipedia.org/wiki/Saepta_Julia Saepta Julia]. [https://en.wikipedia.org/wiki/National_Archaeological_Museum,_Naples National Archaeological Museum, Naples (inv. Nr. 9109)], from [https://en.wikipedia.org/wiki/Herculaneum Herculaneum], [https://en.wikipedia.org/wiki/Augusteum Augusteum] - [https://en.wikipedia.org/wiki/Wikimedia_Commons Wikimedia Commons]</ref> ]]
'''Cheiron''',<br/>
a chess program by [[Ulf Lorenz]]. [https://de.wikipedia.org/wiki/Cheiron Cheiron] is the German spelling of [https://en.wikipedia.org/wiki/Chiron Chiron], a [https://en.wikipedia.org/wiki/Centaur centaur] creature of the [https://en.wikipedia.org/wiki/Greek_mythology Greek mythology]. The program played the [[WCCC 1995|8th World Computer Chess Championship 1995]] in [https://en.wikipedia.org/wiki/Sha_Tin Shatin], [https://en.wikipedia.org/wiki/Hong_Kong Hong Kong] and the [[WMCCC 1995|13th World Microcomputer Chess Championship 1995]] in [https://en.wikipedia.org/wiki/Paderborn Paderborn], as well the [[IPCCC 1994]] and [[IPCCC 1997]].
=Description=
from the [[ICGA]]-site <ref>[https://www.game-ai-forum.org/icga-tournaments/program.php?id=188 Cheiron's ICGA Tournaments]</ref>:
In [https://en.wikipedia.org/wiki/Greek_mythology Greek mythology], [https://en.wikipedia.org/wiki/Chiron Cheiron] was the wisest of all [https://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]], [[Extensions|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 [[Checkmate|mating]] and [[Promotions|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, [[Outposts|everlasting knights]] etc. as well as special situations in the [[Endgame|endgame]] (e.g. there are positions when two pawns are more worth than a rook).
On a [[x86|Pentium]] 90MHz the program will search about 10,000 [[Nodes per Second|nodes per second]]. Cheiron is more a [[Strategy|positional]] playing than a [[Tactics|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.
=Selected Games=
[[WCCC 1995]], round 1, [[Gandalf]] - [[Cheiron]] <ref>[https://www.game-ai-forum.org/icga-tournaments/round.php?tournament=29&round=1&id=5 Shatin 1995 - Chess - Round 1 - Game 5 (ICGA Tournaments)]</ref>
<pre>
[Event "WCCC 1995"]
[Site "Shatin, Hong Kong"]
[Date "1995.05.25"]
[Round "1"]
[White "Gandalf"]
[Black "Cheiron"]
[Result "0-1"]
1.e4 e6 2.d4 c5 3.Nf3 cxd4 4.Nxd4 Nf6 5.Bd3 Be7 6.O-O Nc6 7.Be3 O-O 8.Nc3 d6 9.Nxc6 bxc6 10.f3 d5
11.e5 d4 12.exf6 Bxf6 13.Bxd4 Qxd4+ 14.Kh1 Rb8 15.Rb1 Rd8 16.Qe2 Bb7 17.a3 Be5 18.Rfe1 Bc7 19.Qe4
Qxe4 20.Nxe4 Rd5 21.g3 c5 22.Kg2 Rbd8 23.h3 Bb6 24.b3 Rd4 25.Re3 R4d7 26.Re2 Rd5 27.Bc4 Rd1 28.Rxd1
Rxd1 29.h4 g6 30.Kf2 Kf8 31.Re1 Rxe1 32.Kxe1 Ke7 33.g4 f5 34.Ng5 h6 35.Nxe6 Bxf3 36.gxf5 gxf5 37.c3
Kd6 38.Kd2 Bd5 39.Bxd5 Kxd5 40.Nf4+ Ke4 41.Nd3 f4 42.h5 c4 43.bxc4 Be3+ 44.Kc2 f3 45.a4 f2 46.Nxf2+
Bxf2 47.a5 0-1
</pre>
=See also=
* [[Achilles]]
* [[Centaur]]
* [[Chiron]]
=External Links=
==Chess Program==
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=188 Cheiron's ICGA Tournaments]
==Misc==
* [https://de.wikipedia.org/wiki/Cheiron Cheiron – Wikipedia.de] (German)
* [https://en.wikipedia.org/wiki/Chiron_(disambiguation) Chiron (disambiguation) from Wikipedia]
* [https://en.wikipedia.org/wiki/Chiron Chiron from Wikipedia]
* [https://commons.wikimedia.org/wiki/Category:Chiron?uselang=en Category:Chiron - Wikimedia Commons]
=References=
<references />
'''[[Engines|Up one Level]]'''
[[Category:Mythology]]
[[Category:DosEngine]]
