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a chess program by [[Peter van Diepen]], which competed the [[Dutch Open Computer Chess Championship|Dutch Computer Chess Championships]] in [[DOCCC 1981|1981]] and [[DOCCC 1983|1983]], and the unofficial Dutch championship matches in 1979 and 1980, where IGM lost from [[Bs6676]], and [[Bs6676#DUTCH1980|drew]] [[Barend Swets|Barend Swets']] program in 1980 to share the 'title' <ref>[http://old.csvn.nl/dcc_hist.html Dutch Computer Chess Championships - Complete History of Rankings and Games] by [[Theo van der Storm]]</ref>. IGM was written in [[Lisp]], time critical parts of the Max Board [[6800|6802]] version <ref>[https://sites.google.com/site/gogleoops/6802-max-board MC6802 Max Board - OLD Micros]</ref>, which played the [[DOCCC 1981]], in [[Assembly]] <ref>[[Peter van Diepen]] (ed.) ('''1982'''). ''Toernooibulletin van het Nederlands kampioenschap computerschaak 1981 - Tabel 3. Deelnemers''. [http://www.schaakcomputers.nl/hein_veldhuis/database/files/03-1982,%20toernooibulletin%20van%20het%20Nederlands%20kampioenschap%20computerschaak%201981.pdf pdf] hosted by [[Hein Veldhuis]]</ref> .