L27Excentrique
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[ Cam disc with tappet [1] L’Excentrique,
a chess program by Claude Jarry running on Amdahl mainframe computers [2]. It incorporated iterative deepening with two ply increments, to overcome possible inconsistencies introduced by the alternation of attacking and defensive continuations returned by successive even-odd ply searches [3]. Further, the program used pure Minimax for the first few iterations in order to find and save the strongest continuation for each first level move. On deeper levels, L’Excentrique employs alpha-beta. Jarry argued that finding the strongest continuation for each first ply move on the initial few iterations results in faster searches on later iterations [4].
Photos
Claude Jarry with L’Excentrique, ACM 1979 [6]
Games
Fast Searcher
According to Robert Hyatt, L’Excentrique was a fast and tactical strong searcher [9] :
External Links
References
- ↑ Excentrique (mécanique)
- ↑ Ben Mittman, Monroe Newborn (1980). Computer chess at ACM 79: the tournament and the man vs. man and machine match. Communications of the ACM, Vol. 23, Issue 1, pdf from The Computer History Museum
- ↑ Eric Thé (1992). An analysis of move ordering on the efficiency of alpha-beta search. Master’s thesis, McGill University, advisor Monroe Newborn
- ↑ David Levy, Monroe Newborn (1982, 1983). All About Chess and Computers. Springer, Postscript: 1978 – 80 and BELLE The World Champion
- ↑ David Levy, Ben Mittman, Monroe Newborn (1980). 3rd World Computer Chess Championship. ICCA Newsletter, Vol. 3, No. 3, reprinted in The Fourth World Computer Chess Championship (labeled 22nd ACM), pdf from The Computer History Museum, pdf from Danny Kopec
- ↑ Photo gifts by Monroe Newborn, The Computer History Museum
- ↑ Linz 1980 - Chess - Round 1 - Game 1 (ICGA Tournaments)
- ↑ Linz 1980 - Chess - Round 3 - Game 3 (ICGA Tournaments)
- ↑ Re: Who is the better chess program author? by Robert Hyatt, CCC, December 13, 2001