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Subject: Re: Thanks -- and a question about "fortress" recognition in programs

Author: Aaron Tay

Date: 01:49:40 03/22/02

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On March 21, 2002 at 15:23:38, Dann Corbit wrote:

>On March 21, 2002 at 15:13:12, Steve wrote:
>
>>Thanks to all of you for your responses.  Is it possible to have programs
>>recognize "fortresses" by instructing them to decide, when the evaluation has
>>remained static throughout a certain number of ply, that the position must be a
>>draw?

It seems rather pointless to add this though in cases where you already drifted
into a drawn position. I suppose for some programs, you can see some of the
scores dropping, as the 50 move rule starts to come closer, those it's already
useless in cases when it's drawn..


>Hossa has done some work on detecting walls.  I think that fortress detection is
>a good idea too.  The problem is that I don't know of a single algorithm to
>detect such a thing.  A lot of times, we simply recognize a fortress.  But the
>question is "How did our brains arrive at the 'stalemate' conclusion?"


[D]8/5K2/8/8/5N2/4p3/3qN2k/8 b - -

Easier to solve i think, the human sees that the queen alone cannot mate. And
the king cannot move. Any attempt to sac the queen draws..


[D]8/8/1q6/1kp5/2p5/2P5/KP6/4R3 w KQkq -

Hmm this one is harder. I think the human sees the queen alone cannot win. Yet
bringing the king forward doesn't "help"...





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