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Subject: Re: Search algorithms

Author: Robert Hyatt

Date: 06:49:33 11/06/03

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On November 06, 2003 at 09:33:28, Renze Steenhuisen wrote:

>On November 06, 2003 at 08:33:49, Gian-Carlo Pascutto wrote:
>
>>On November 06, 2003 at 05:45:53, Renze Steenhuisen wrote:
>>
>>>Depth-First Algorithms:
>>>  AlphaBeta (Fail-hard, Fail-Soft)
>>>  MTD(f)
>>>
>>>Best-First Algorithms:
>>>  SSS*
>>
>>The distinction between the three (and best-first and depth-first)
>>is very hazy, read "Research re: search and research" by Aske Plaat.
>
>Done that already, but as Aske stated: they search the same nodes, but in a
>different order.
>
>MTD(f) and the others are still DF algorithms, the second list works differently
>(i.e., the order in which the nodes are expanded is different).
>
>Or am I talking rubish?
>
>Renze
>
>PS:  Am I missing algorithms (either important or not)?
>PS2: Are Scout and NegaScout equal?


They are just variations on the same idea.  All fall under the umbrella
of alpha/beta depth-first search...  (this is in response to your question
PS2).

depth-first and breadth-first (best-first is one example of the latter)
are totally unrelated other than the fact they both search a tree.




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