LogiChess

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**LogiChess**, 
the first chess program by [[Kaare Danielsen]] developed in 1981 for an [[Intel]] [[https://en.wikipedia.org/wiki/Intel_MCS-48|8048]] compatible 80C50 [[https://en.wikipedia.org/wiki/CMOS|CMOS]] [[https://en.wikipedia.org/wiki/Microcontroller|microcontroller]] with 4 K Kibi internal [[Memory#ROM|EPROM]] and only 256 byte internal [[Memory#RAM|RAM]], and a [[https://en.wikipedia.org/wiki/Clock_rate|clock frequency]] of 3.6 resp. 7.2 MHz. It competed at the [[European MCC 1981|2nd European MCC 1981]] (3rd place) <ref>Logichess by the 17-year-old Danish schoolboy [[Kaare Danielsen]] was 3rd, from
[[http://www.chesscomputeruk.com/html/chess_computers_-_the_uk_story.html|Chess Computers - The UK Story]] from [[http://www.chesscomputeruk.com/index.html|Chess Computer UK]] by [[Mike Watters]]</ref> and two [[World Microcomputer Chess Championship|World Microcomputer Chess Championships]] in [[WMCCC 1981|1981]] and [[WMCCC 1983|1983]], at times supported by [[Hartvig Ekner]]  <ref>[[Frederic Friedel]] (**1984**). //Move from the East//. Report of the WMCCC 1983, [[Personal Computer World]], January 1984</ref>. 

=SciSys & CXG=
As [[Dedicated Chess Computers|dedicated chess computer]], LogiChess was sold in approximately 200.000 units <ref>[[http://www.danielsen.com/resume.shtml|Resume for Kaare Danielsen]]</ref> from [[Saitek|SciSys]] as [[SciSys Explorer]], [[SciSys Explorer#Concord|SciSys Concord II]] and [[SciSys Explorer#Companion|SciSys Companion II]], and from [[https://en.wikipedia.org/wiki/RadioShack|RadioShack]] as //Tandy 1650// <ref>[[http://www.schach-computer.info/wiki/index.php/Tandy_1650|Tandy 1650]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]]</ref>. Another 4K branch was realized for [[Newcrest Technology]], for the [[6800]] instruction set compatible [[https://en.wikipedia.org/wiki/Hitachi_Ltd.|Hitachi]] [[6800#6301|HD6301V1]] 8-bit controller for the [[CXG Sensor Computachess#III|CXG Computachess III]] in 1984 <ref>[[http://www.schach-computer.info/wiki/index.php/CXG_Computachess_III|CXG Computachess III]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]] (German)</ref>,  as well the Newcrest 6301V <ref>[[http://www.schach-computer.info/wiki/index.php/6301V|6301V]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]]</ref> inside the [[CXG Star Chess]] of 1985 <ref>[[http://www.schach-computer.info/wiki/index.php/CXG_Star_Chess|CXG Star Chess]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]]</ref> <ref>[[http://www.schach-computer.info/wiki/index.php/Danielsen,_Kaare|Danielsen, Kaare]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]]</ref>. According to its author, LogiChess is still the strongest 4K chess computer in the world <ref>[[http://www.danielsen.com/resume.shtml|Resume for Kaare Danielsen]]</ref>.

=Lexibook=
The [[Motorola]] [[6800]] LogiChess branch was still in production in the 2000s, as used in all the **Lexibook** computers <ref>[[http://www.spacious-mind.com/html/lexibook.html|Lexibook Electronic Chess Computers]] from [[The Spacious Mind]]</ref> with [[https://en.wikipedia.org/wiki/Freescale_68HC08|68HC08]] compatible microcontrollers <ref>[[http://www.schach-computer.info/wiki/index.php/Danielsen,_Kaare|Danielsen, Kaare]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]]</ref> <ref>[[http://www.spacious-mind.com/html/travel_chess_explorer.html|Lexibook Travel Chess Explorer Electronic Chess Computer]] from [[The Spacious Mind]]</ref> <ref>[[http://www.spacious-mind.com/html/chessman_pro.html|Lexibook ChessMan Pro Electronic Chess Computer]] from [[The Spacious Mind]]</ref> <ref>[[http://www.schach-computer.info/wiki/index.php/Lexibook_Travel_Chess|Lexibook Travel Chess]] from [[http://www.schach-computer.info/wiki/index.php/Hauptseite_En|Schachcomputer.info Wiki]] (German)</ref>.

=Selected Games=
[[#CyrusLogiChess1983]][[WMCCC 1983]], round 1, [[Cyrus 68K|65 Cyrus X]] - [[LogiChess|LogiChess 2.2]] <ref>[[http://www.game-ai-forum.org/icga-tournaments/round.php?tournament=66&round=1&id=2|Budapest 1983 - Chess - Round 1 - Game 2 (ICGA Tournaments)]]</ref>
[[code]]
[Event "WMCCC 1983"]
[Site "Budapest, Hungary"]
[Date "1983.10.13"]
[Round "1"]
[White "65 Cyrus X"]
[Black "LogiChess 2.2"]
[Result "0-1"]

1.d4 Nf6 2.c4 e6 3.Nc3 d5 4.e3 Nc6 5.Be2 Ne4 6.Nxe4 dxe4 7.c5 Qg5 8.g3 Qf5 
9.Bg4 Qd5 10.Bd2 h5 11.Be2 e5 12.Bc3 h4 13.Bb5 hxg3 14.Bxc6+ Qxc6 15.fxg3 Be6 
16.h4 b6 17.cxb6 axb6 18.a4 exd4 19.Qxd4 f6 20.Qd1 Bc5 21.Ne2 Bxe3 22.Nd4 Qd6 
23.Ne2 Qxd1+ 24.Kxd1 Rxa4 25.Kc2 b5 26.Rxa4 bxa4 27.Bd4 Bh6 28.Nc3 Bb3+ 29.Kb1 
f5 30.g4 fxg4 31.Nxe4 O-O 32.Re1 Rf3 33.Ng5 Bxg5 34.hxg5 Rd3 35.g6 Rd1+ 36.Rxd1 
Bxd1 37.Kc1 Bf3 38.Kd2 Be4 39.Ke3 Bxg6 40.Be5 c5 41.Kf4 Bh5 42.Kg5 g6 43.Kf6 c4 
44.Ke6 c3 45.bxc3 a3 46.c4 a2 47.c5 g3 48.c6 g2 49.Bd4 g1=Q 50.Bxg1 a1=Q 51.Bc5 
Bg4+ 52.Kd6 Bf3 53.Bf2 Qd1+ 54.Kc7 Qc1 55.Bg3 Qxc6+ 56.Kd8 Bg4 57.Ke7 Qe6+ 
58.Kd8 Qd7# 0-1 
[[code]]

=See also=
* [[CXG Sensor Computachess#III|CXG Computachess III]]
* [[CXG Star Chess]]
* [[Enterprise]]
* [[SciSys Explorer]]

=External Links=
* [[http://www.game-ai-forum.org/icga-tournaments/program.php?id=468|LogiChess' ICGA Tournaments]]
* [[http://www.danielsen.com/resume.shtml|Resume for Kaare Danielsen]]

=References= 
<references />
=What links here?= 
[[include page="LogiChess" component="backlinks" limit="20" ]]
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