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Subject: Re: chess search algorithms

Author: Dan Andersson

Date: 09:00:21 02/19/03

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Current state of the art chess programs use:
 Alpha-Beta with memory (Hash tables) with aspiration window and nullmove
pruning. Current best performing implementations are PV-Negasout and MTD(f).
 Quiescence search at the leaf nodes to alleviate the horizon effect. Some
include checking moves in the QSearch. Some hash the QSearch positions.
 The search incorporates search depth extensions for certain situations like
recapturing and pushing a pawn to the seventh rank. Some other kinds of pruning
are sometimes used.

MvH Dan Andersson



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