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[[Piece Recognition|Automatic piece recognition]] was implemented with [https://en.wikipedia.org/wiki/Hall_effect_sensor Hall effect sensors] under each square of the chessboard, while pieces had two reverse directed [https://en.wikipedia.org/wiki/Magnet permanent magnets] with different compensation embedded, so that a cyclic running multiplexed I/O program, also polling the keyboard, could recognize the pieces <ref>[http://www.robotron-net.de/sonstiges.html#CM OEM und Sonstiges - Schachcomputer "ChessMaster"] from [http://www.robotron-net.de/ Robotron-net.de] (German)</ref> <ref>[http://www.robotron-net.de/Service/Dokus/CM-Sp.jpg Chess-Master circuit diagram] hosted by [http://www.robotron-net.de/ Robotron-net.de]</ref> .
Chess-Master played the [[WMCCC 1983|3rd World Microcomputer Chess Championship]] 1983 in [https://en.wikipedia.org/wiki/Budapest Budapest], running on a 2.5 MHz processor, searching 12 - 15 [[Nodes per Second|nodes per second]] <ref>[[Frederic Friedel]] ('''1984'''). ''Move from the East''. Report of the WMCCC 1983, [[Personal Computer World]], January 1984</ref>, and competed with [[Sensory 9|Fidelity Sensory 9]] for the title of the best commercial entry <ref>[[David Kittinger]] ('''1984'''). ''Report from Budapest''. [[Computer Chess Reports|Computer Chess Digest Annual 1984]] pp. 34</ref>. According to [[Ingo Althöfer]], the Chess-Master was a clone of the [[Chafitz ARB Sargon 2.5|Sargon 2.5]] [[6502]] program by [[Dan Spracklen|Dan]] and [[Kathe Spracklen]] - the 6502 had to be emulated by the U880 aka Z80 which apparently resulted in that low speed <ref>[https://en.chessbase.com/post/east-german-programmers-in-budapest#discuss East German programmers in Budapest - Discussion] by [[Ingo Althöfer]], [[ChessBase|ChessBase News]], July 07, 2020</ref>.
=Chess-Master Table=
[[FILE:Schachcomputer-CM-diamond.jpg|border|right|thumb| Chess-Master Diamond <ref>[http://commons.wikimedia.org/wiki/Mikroelektronik Kombinat Mikroelektronik Erfurt (KME) from Wikimedia Commons], Photo by [http://commons.wikimedia.org/wiki/User_talk:Erdmann_Schleinitz Erdmann Schleinitz]</ref> ]]
The improved '''Chess-Master Diamond''' was contributed by [[Rüdiger Worbs]] and [[Wolfgang Pähtz]] <ref>[http://www.schach-computer.info/wiki/index.php/Chess-Master_Diamond Chess-Master Diamond] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)</ref> , and was released in 1987 <ref>[http://www.schach-computer.info/wiki/index.php/Chess-Master_Diamond Chess-Master Diamond] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)</ref> .
<span id="VideoChessMaster"></span>
=Video Chess-Master=
[[FILE:VideoChess-Master.gifjpg|border|right|thumb|link=https://www.schachburg.de/threads/2414-Der-Video-Chess-Master-in-der-DDR| Video Chess-Master Screen <ref>[https://www.schachburg.de/threads/2414-Der-Video-Chess-Master-in-der-DDR Der Video Chess-Master in der DDR]</ref> ]]
The Chess-Master program was further ported to the [https://en.wikipedia.org/wiki/KC_85 KC 85/2] [https://en.wikipedia.org/wiki/Personal_computer personal computer] by [[Wolfgang Pähtz]] <ref>[http://paehtz.eu/Sammlung/Schachcomputer Schachcomputer (DDR)] by [[Wolfgang Pähtz]]</ref>.
* [http://paehtz.eu/Sammlung/Schachcomputer Schachcomputer (DDR)] by [[Wolfgang Pähtz]]
* [https://en.chessbase.com/post/east-german-programmers-in-budapest East German programmers in Budapest] by [[Frederic Friedel]], [[ChessBase|ChessBase News]], July 05, 2020 » [[WMCCC 1983]]
: [https://en.chessbase.com/post/east-german-programmers-in-budapest#discuss East German programmers in Budapest - Discussion] by [[Ingo Althöfer]], [[ChessBase|ChessBase News]], July 07, 2020
=References=
'''[[Engines|Up one level]]'''
[[Category:Commercial]]
[[Category:Clone]]
[[Category:Z80]]
[[Category:Dedicated]]
[[Category:Master]]
