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a Dutch physicist and since 1976 computer chess programmer. He wrote a blitz program for the [[PDP-11]] and programs for the [[6800]] and [[6502]] 8-bit µ-Processors, released under the name [[Usurpator]], which competed in several [[Dutch Open Computer Chess Championship|Dutch Computer Chess Championships]]. In [[DOCCC 1986|1986]] HGM came up with a [[Usurpator#Matchbox|matchbox computer ]] with a [http://www.baltissen.org/newhtm/65sc816.htm 65SC816] CPU for the purpose of running Usurpator <ref>[[Jaap van Oosterwijk Bruyn]] ('''1986'''). ''Nona retains her Title''. [[ICGA Journal#9_3|ICCA Journal, Vol. 9, No. 3]]</ref>, competing three times until [[DOCCC 1990|1990]] <ref>Harm Geert Muller ('''1990'''). ''A Matchbox Chess Computer''. [[ICGA Journal#13_4|ICCA Journal, Vol. 13, No. 4]]</ref>.