{"type":"ScholarlyArticle","title":"A Hybrid SSS*/Alpha-Beta Algorithm for Parallel Search of Game Trees","authors":[{"name":"Daniel B. Leifker","slug":"daniel-b-leifker","given":"Daniel B.","family":"Leifker","affiliation":""},{"name":"Laveen N. Kanal","slug":"laveen-n-kanal","given":"Laveen N.","family":"Kanal","affiliation":""}],"abstract":"This paper explores the issues that ar!se when SSS*-llke search algorithms are implemented in parallel. There is an important imp!icit assumpt!on regard!ng the OPEN Iist of sss• (and A*-like algorithms): those states wh!ch are guaranteed never to become part of an optimal solution are forced down !nto the OPEN Ii st and never rise to the top for expansion. Howev e r, when multiple proce ssors are introduced in a parallel version of sss·. these buried states become subject to expansion despite their provable suboptimality. If such states are not !dent!fied and purged , they may exert an enormaus drag on the parallel algorithm because cons!derable processor effort will be wasted. However , the pruning mechanisms of alpha-beta can be adapted by a parallel SSS*; the resulting algorithm HYBRID is su!table for searc hing game trees and general AND / OR trees in parallel.","doi":null,"url":"https://ijcai.org/proceedings/1985/211","pdf":"https://ijcai.org/proceedings/1985/0211.pdf","markdown":"https://ijcai.org/proceedings/1985/211.md","bibtex":"https://ijcai.org/proceedings/1985/bibtex/211","volume":{"slug":"1985","title":"Proceedings of the Ninth International Joint Conference on Artificial Intelligence","short_title":"IJCAI 1985","url":"https://ijcai.org/proceedings/1985/","year":1985,"location":"Los Angeles, California, USA","dates":"","editors":"Aravind Joshi","isbn":"","publisher":"International Joint Conferences on Artificial Intelligence","doi_prefix":""},"section":"Planning and Search","track":"Planning and Search","number":211,"pages":{"first":1044,"last":1045},"keywords":[],"videos":[],"references":[],"license_note":"Copyright International Joint Conferences on Artificial Intelligence."}