Automatic piece recognition was implemented with Hall effect sensors under each square of the chessboard, while pieces had two reverse directed permanent magnets with different compensation embedded, so that a cyclic running multiplexed I/O program, also polling the keyboard, could recognize the pieces [1][2] .
The Chess-Master Table was a rare piece of jewelry. Only approximately 10 issues were build for special purposes - for instance, one Chess-Master Table was dedicated to Fidel Castro, a gift by Erich Honecker[6][7] .
a dedicated chess computer series manufactured in the 80s by VEB Mikroelektronik „Karl Marx“ Erfurt, East Germany, in West Germany sold by Radiophon. Chess-Master ran on an 8-bit U880 CPU, which was an unlicensed Z80 clone, and had 10 KB ROM and 2 KB RAM. The chess program was initially written by Dieter Schultze and Rüdiger Worbs.
Automatic piece recognition was implemented with Hall effect sensors under each square of the chessboard, while pieces had two reverse directed permanent magnets with different compensation embedded, so that a cyclic running multiplexed I/O program, also polling the keyboard, could recognize the pieces [1] [2] .
Chess-Master played the 3rd World Microcomputer Chess Championship 1983 in Budapest, running on a 2.5 MHz processor, searching 12 - 15 nodes per second [3], and competed with Fidelity Sensory 9 for the title of the best commercial entry [4].
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Chess-Master Table
The Chess-Master Table was a rare piece of jewelry. Only approximately 10 issues were build for special purposes - for instance, one Chess-Master Table was dedicated to Fidel Castro, a gift by Erich Honecker [6] [7] .Chess-Master Diamond
the improved Diamond version was contributed by Rüdiger Worbs and Wolfgang Pähtz [10] , and was released in 1987 [11] .
Video Chess-Master
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