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Subject: Re: False hash probes in endgame and how to avoid this problem

Author: Sergei S. Markoff

Date: 09:42:15 02/02/03

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Hello Robert!

>>Is it proven?
>
>Yes.  The game of chess is a graph, not a tree, which means the pathways are
>interlinked in odd ways.  But the 50 move rule and repetition rules are
>written with the idea of a tree, because of the tranposition table.  The only
>way to fix it is to include the "graph information" which is the complete path
>from the starting position to the position being stored...

OK, we can't find the exact solution. But may be we can found non-exact
solution. For example hash can't save all positions during search, but it works
well.

>I'm not sure what you would do to "not accept some hash probes."

It means that some probes we can not accept totally. We can use best move, but
research the subtree again.

Sincerelly yours,
Sergei




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