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Subject: Re: A new(?) technique to recognize draws

Author: Dan Andersson

Date: 08:35:31 06/01/02

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The idea is similar to enumerating the state space in simple endgames. You will
select a won or unevaluated state for the attacker and a drawn or unevaluated
state for the defender. This will become an exact graph of the state space after
the iterations produce no more states. There are a few problems AFAIK. When will
you trigger the start of the algorithm? When is it cost effective, size of the
graph? How will you limit the enumeration, escape conditions? And it will work
much better when you have one attacker and one defender. In an ordinary game
search the position might be ambigious as to the eventual outcome and attacker
and defender might switch place due to a latent mate threat for example. The
idea will work wonders on fortress positions with locked pawns. But for more
dynamic positions with distinct conversions, a proof-number search or lambda
search will be more efficient. A PN^2 search will find a draw as easily as a win
given the right termination conditions.

MvH Dan Andersson



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