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[[Don Beal|Don Beal's]] Chess Program, which participated at four [[World Computer Chess Championship|World Computer Chess Championships]], the [[WCCC 1977]], [[WCCC 1980]], [[WCCC 1983]] and [[WCCC 1986]]. In 1980 running on a [[PDP-11|PDP-11/70]], since 1983 BCP was custom-build computer with a fast [[Sequential Logic|sequential logic]] controlled by a [https://en.wikipedia.org/wiki/Zilog_Z8000 Zilog Z8000] [https://en.wikipedia.org/wiki/16-bit 16-bit] [https://en.wikipedia.org/wiki/Microcomputer micro computer]. The program was written in [[C]], [[Assembly]], and [https://en.wikipedia.org/wiki/Microcode Microcode], performing 20K [[Nodes per Second|Nodes per second]] (1983) <ref>[http://www.computerhistory.org/chess/full_record.php?iid=doc-431614f6c8af8 The Fourth World Computer Chess Championship] (labeled 22nd ACM), [http://archive.computerhistory.org/projects/chess/related_materials/text/3-1%20and%203-2%20and%203-3%20and%204-3.1983_WCCC/1983-%20WCCC.062303061.sm.pdf pdf] from [[The Computer History Museum]], [http://www.sci.brooklyn.cuny.edu/%7Ekopec/Publications/Publications/O_36_C.pdf pdf] from [[Danny Kopec]]</ref>.