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Subject: Evaluation of Tactical Positions

Author: Bob Durrett

Date: 09:15:47 11/17/02



The best way for a human to evaluate a tactical position is, presumably, to look
at lines (beginning with forced move sequences) emanating from that position.

But I wonder . . .

Is it possible to just look for "indicators" in the position which would
indicate the likelihood of a combination being present?  I have read some
writings of GMs in hardcopy chess books about this.  They seem to suggest that
positions containing combinations "smell" like a combination.  In other words,
the GM is alerted to the possibility of a combination even though he has not yet
found it.

Assume, for the sake of discussion, that this is true.  i.e. that it is POSSIBLE
to detect the likely presence of a combination, without looking at any move
sequences.  It would be sufficient if it worked most of the time.

If true, then it might be possible to use this to improve evaluation of
positions, especially leaf node positions.

Maybe it would take a GM to specify what the chess engine's position evaluator
would have to look for.  But is it doable?

Better yet, do the present-day top chess engines already do this during position
evaluation?  At least to some extent?

Just a thought.

Bob D.



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