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Subject: Yet another 'horizon effect' problem

Author: David B Weller

Date: 16:04:52 02/14/06


I was just thinking about knight forks, and thought of yet another way an engine
can 'delude itself'

Lets say, white can fork black, but it is at the horizon. 0 depth remaining

Now if black _HAS_ any captures, they will allow white to play its capture and
the gain of the fork will be realized

But all black has to do, to make the position seem better, is retract any
threats it has, and poof! the fork disappears [search ends with white's knight
move, and it never gets to play the capture]

I suspect there are a ton more rediculous things going on at the horizon that I
havent even thought of...what else is lost at the horizon!?!?!

Delay type threats, capture/recaptures, hiding double attacks, ....

I wonder, if there are so many different types of these things, and it isnt
really worth trying to catch the few I have found by, eg., recap extension,
threat extensions, etc...

Thoughts?



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