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Subject: Redacting the ECM suite

Author: Don Dailey

Date: 11:38:14 05/01/98


Hi everyone,

Howard asked me to finish the process of redacting the ECM set.  Since
I now have plenty  of spare time I am  willing to do this, if everyone
agree's.

I suggest that we leave the easy  problems in the set.  The consensous
seems to be the same.  There is no harm in  having a few easy ones and
some of us  have expressed some  concern that  the elimination process
could be subject to problems.  I agree with this viewpoint.

The main thing to address  is the correctness of  the set as it stands
now.  If anyone finds or suspects errors,  let's post this and open it
up for discussion.  To   summarize  our criteria for  inclusion,  each
position should have  the following characteristics (please correct me
if I'm wrong on what was agreed to):

A) Solution should be correct.  (obviously)

B) Solution  should  not be   an  obvious move   that any program  has
   some  chance  of  playing even if  it doesn't really understand the
   idea.

C) All solutions  should be given.  It's ok to have multiple solutions
   if  they  all  involve  a winning plan.   Conversely, non-solutions
   should change the game theoretic outcome with perfect play.

Later on, if anyone is interested, we can sort  the set by difficulty.
This can be  approximated by having n  programs sort them individually
and then   combining  the results in some   fashion  such  as average,
median, worst case ranking or some other method.   We can discuss this
later if anyone feels it is worth persuing.

- Don




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