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the dominating chess machine in the late 70s and early 80s, was developed by [[Ken Thompson]] and [[Joe Condon]] <ref>[http://www.nj.com/independentpress/index.ssf/2012/03/creator_of_belle_computer_ches.html Creator of Belle computer chess dies at 76], [http://www.nj.com/ NJ.com], March 02, 2012</ref> from [[Bell Laboratories]]. It was five times winner of the [[ACM North American Computer Chess Championship]], the [[ACM 1978]], [[ACM 1980]], [[ACM 1981]], [[ACM 1982]], and [[ACM 1986]], and won the [[WCCC 1980|Third World Computer Chess Championship]] 1980 in [https://en.wikipedia.org/wiki/Linz Linz] <ref>[https://www.game-ai-forum.org/icga-tournaments/tournament.php?id=68 3rd World Computer Chess Championship]</ref>.
Belle consists of a special-purpose hardware and associated software, and was pure [[Brute-Force|brute-force]]. Belle started in the early 70s as a sole software approach, but more and more emerged to a hybrid chess computer, next using a [[Move Generation|move generator]], a [[Evaluation|position evaluator]], and a [[Transposition Table|transposition table]] inside a special-purpose hardware. In its final incarnation, Belle was composed of a [[PDP-11|PDP-11/23]], and further a [https://en.wikipedia.org/wiki/LSI-11#LSI-11 LSI-11] processor with several custom boards. The speed increased from 200 [[Nodes per secondSecond|nps]] from the software version to about 160,000 nps of the machine mentioned at the [[Advances in Computer Chess 3]] conference in 1981.
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