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From 1970 to 1971, as undergraduate student at Columbia, along with [[Aron Eisenpress]], [[Andrew Koenig]], and [[Ben Yalow]], he co-authored the chess program [[CCCP (US)|CCCP]], which competed at the [[ACM 1971]], and was initially based on [[Hans Berliner|Hans Berliner's]] program [[J. Biit]], which [[ACM 1970|played one year before]] <ref>[http://www.columbia.edu/cu/computinghistory/index.html#cccp Computing at Columbia Timeline - Aug 3-5, 1971]</ref> <ref>[http://www.columbia.edu/cu/computinghistory/elliott-frank.html#cccp Recollections of CUCC 1968-70 -The CCCP Chess Program]</ref> . Andrew Koenig on the individual roles of [[CCCP (US)|CCCP's]] programming team <ref>[[Andrew Koenig]] ('''1978'''). ''Light-Pen used in game''. [[Personal Computing#2_5|Personal Computing, Vol. 2, No. 5]], pp. 112</ref>: [[Andrew Koenig|I]] designed the overall structure of the program and coded much of the [[User Interface|human interface]]. [[Steven M. Bellovin|Steve]] wrote the [[Search|tree searching]] and [[Pruning|pruning]] routines, [[Ben Yalow|Ben]] did the [[Move Generation|move generation]] and [[Evaluation|evaluation routines]], and [[Aron Eisenpress|Aron]] wrote the part of the human interface that made it possible to [[Entering Moves|enter moves]] at a [https://en.wikipedia.org/wiki/IBM_2250 2250 display] with a [https://en.wikipedia.org/wiki/Light_pen light pen] ...