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a chess program by primary author [[Victor Vikhrev]] and [[Alexey Manjakhin]]. Its development already started in 1971, when Victor Vikhrev wrote his first chess program in [[Algol]] for the [https://en.wikipedia.org/wiki/BESM#BESM-6 BESM-6]. During the 80s the program was re-written in [[Pascal]] to run on an [[IBM PC]] <ref>http://adamant1.fromru.com/centaur.html Кентавр (Russian, as of October 2018 no longer available)</ref> <ref>[https://chesspro.ru/guestnew/looknullmessage/?themeid=54&id=31&page=10#54-31-4381 ChessPro online | Шахматный форум | Новости мира движков] (Russian)</ref>. As one of the rare instances of a [[Best-First|best-first]] searcher, Centaur keeps its complete [[Search Tree|search tree]] in [[Memory|memory]] and considers multiple optimistic and pessimistic [[Evaluation|evaluation]] scores to grow the tree.