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an experimental chess program of the early 1980s developed by [[Fred Popowich]] and [[Tony Marsland]] at [[University of Alberta]], written in [[C]], to research on [[Parallel Search|parallel search]]. In partcicular particular addressing search overhead and communication overhead, the [[Parallel Search#Speedup|speedup]] of [[Parallel Search#PrincipalVariationSplitting|principal variation splitting]] with various setups was investigated, later revised by [[Tim Breitkreutz]] et al. to run Parabelle under ''network multiprocessor package'' (NMP), a [https://en.wikipedia.org/wiki/Parallel_Virtual_Machine PVM]-like [https://en.wikipedia.org/wiki/Message_passing message passing] library <ref>[[Tony Marsland]], [[Tim Breitkreutz]], [[Steve Sutphen]] ('''1991'''). ''A Network Multiprocessor for Experiments in Parallelism.'' Concurrency: Practice and Experience, Vol. 3, No. 3, pp. 203-219. [https://webdocs.cs.ualberta.ca/~tony/RecentPapers/cpe.pdf pdf]</ref>. Parabelle was initially based on [[Ken Thompson|Ken Thompson's]] program [[Belle|TinkerBelle]] <ref>The original name for [[Belle]] was T.Belle (the [https://en.wikipedia.org/wiki/United_States_Chess_Federation US Chess Federation] required an initial). TinkerBelle was the "invention" of [[Tony Marsland]], and nothing [[Ken Thompson]] knew about or approved</ref> <ref>[https://en.wikipedia.org/wiki/Tinker_Bell Tinker Bell from Wikipedia] a fictional character from [https://en.wikipedia.org/wiki/J._M._Barrie J. M. Barrie's] 1904 play and 1911 novel [https://en.wikipedia.org/wiki/Peter_and_Wendy Peter and Wendy]</ref> , and was itself base for further projects such as the program [[Abyss]], which was subject of research on [[Extensions|selective search extensions]] in the domain of [[Chinese Chess]], and also played tournaments <ref>[[Chun Ye]] ('''1992'''). ''Experiments in Selective Search Extensions''. M.Sc. thesis, Department of Computing Science, [[University of Alberta]], [https://era.library.ualberta.ca/public/datastream/get/uuid:e4fbf48d-7603-490f-85cc-5497bbecf5a8/DS1 pdf]</ref> .