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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> <ref>[[Ingo Althöfer]] ('''2020'''). ''Computer Chess and Chess Computers in East Germany''. [[ICGA Journal#42_23|ICGA Journal, Vol. 42, Nos. 2-3]]</ref>.
=Chess-Master Table=
* [[Thomas Mally]] ('''1989'''). ''Dinosaurus Hi-Tech - Chess Master “Diamond” nicht ganz Lupenrein''. [[Modul]] 1/1989 <ref>[http://www.schaakcomputers.nl/hein_veldhuis/database/files/10-1987%20%5BH-1501%5D%20VEB%20Mikroelektronik%20Erfurt%20-%20Chess-Master%20Diamond.pdf VEB Mikroelektronik Erfurt - Chess-Master Diamond], pdf hosted by [[Hein Veldhuis]]</ref>
* [[Karsten Bauermeister]] ('''1999'''). ''Deutsch-Deutsche Geschichte(n)''. [[Computerschach und Spiele]]. No. 5, October-November 1999, pp 32-33 (German)
* [[Ingo Althöfer]] ('''2020'''). ''Computer Chess and Chess Computers in East Germany''. [[ICGA Journal#42_23|ICGA Journal, Vol. 42, Nos. 2-3]]
=External Links=
* [https://www.game-ai-forum.org/icga-tournaments/program.php?id=481 Chess-Master's ICGA Tournaments]
* [http://www.spacious-mind.com/html/chess-master.html Rft/VEB Erfurt Chess-Master Electronic Chess Computer] from [[The Spacious Mind]]
* [http://www.xs4all.nl/%7Etluif/chescom/EngChesMas.html Chess Master] by [http://www.xs4all.nl/%7Etluif/ [Tom Luif]]* [http://www.xs4all.nl/%7Etluif/chescom/EngCMdiam.html Chess Master Diamond] by [http://www.xs4all.nl/%7Etluif/ [Tom Luif]]
* [https://de.wikipedia.org/w/index.php?title=Schachcomputer_in_der_DDR#CM CM, Schachcomputer in der DDR from Wikipedia.de] (German)
* [http://www.schach-computer.info/wiki/index.php/Chess-Master Chess-Master] from [http://www.schach-computer.info/wiki/index.php/Hauptseite_En Schachcomputer.info Wiki] (German)
