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an idea to turn a [[Depth-First]] to a [[Best-First]] search, like [[MTD(f)]] to utilize [[Null Window|null window]] searches of a [[Fail-Soft|fail-soft]] [[Alpha-Beta]] routine, and to use the [[Bound|bounds]] that are returned in a [https://en.wikipedia.org/wiki/Bisection bisection] scheme. This yields in the '''C'''* algorithm, already proposed by [[Kevin Coplan]] in 1981 along with his chess machine [[Virgo]] <ref>[[Kevin Coplan]] ('''1982'''). ''A special-purpose machine for an improved search algorithm for deep chess combinations.'' [[Advances in Computer Chess 3]]</ref> and '''NegaC'''*, a [[NegaMax]] implementation of '''C'''*, introduced by [[Jean-Christophe Weill]] in 1991 <ref>[[Jean-Christophe Weill]] ('''1991'''). ''Experiments With the NegaC* Search - An Alternative for Othello Endgame Search.'' Heuristic Programming in Artificial Intelligence 2: the second computer olympiad (eds. [[David Levy]] and [[Don Beal]]), pp. 174-188. Ellis Horwood, Chichester. ISBN 0-13-382615-5, [http://www.recherche.enac.fr/%7Eweill/publications/negac.ps.gz zipped postscript] and [http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.39.3189&rep=rep1&type=pdf pdf] from [http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.39.3189 CiteSeerX]</ref>.