A paper on <a href =
https://scholar.google.com/citations?view_op=view_citation&hl=en&user=nbpafUkAAAAJ&cstart=160&sortby=pubdate&citation_for_view=nbpafUkAAAAJ:WF5omc3nYNoC>conspiracy
numbers for min-max search</a> appeared in the Journal of Artificial
Intelligence Research in 1988. The conspiracy number algorithm was
later improved in a paper with Deniz Yuret to <a href = https://www.researchgate.net/publication/2285654_Alpha-Beta-Conspiracy_Search_Draft_of_Oct_20_1993>
alpha-beta-conspiricay (ABC) search</a> in 1993.  Conspiracy numbers
and ABC search influenced <a href = https://pdfs.semanticscholar.org/211d/7268093b4dfce8201e8da321201c6cd349ef.pdf>
the design of Deep Blue</a> which defeated Gary Kasporov in 1997.  The
ABC paper was only a postscript file on my web page until Jonathan
Shaeffer got me to send it to the Journal of the International
Computer Game Association (ICGA) where it appeared in 2002.