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Subject: Re: Chess Engine evaluation question

Author: Robert Hyatt

Date: 07:15:36 12/04/03

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On December 02, 2003 at 21:55:34, Russell Reagan wrote:

>On December 02, 2003 at 21:00:03, Robert Hyatt wrote:
>
>>Makes sense, and points out that there is a _big_ cost for doing that still.
>>The EBF is meaningless when N-1 and N are _both_ doing something that is "bad"
>>in terms of tree search space.
>
>Why is it bad? If program A has an EBF of 2, and program B has an EBF of 3,
>wouldn't you want program A even if program A was 16x slower than program B?
>
>Depth    A Nodes    B Nodes    Who finishes first?
>1        100        100        B
>2        200        300        B
>3        400        900        B
>4        800        2700       B
>5        1600       8100       B
>6        3200       24300      B
>7        6400       72900      B
>8        12800      218700     A
>...

No.  Because A is going to be slower for a _long_ while before it catches
up.  But if you do the N-best search as given, your EBF should not change
whether N=1 (normal) or N=99.  But the time to complete a single iteration will
certainly change by roughly a factor of N.  So I'll take N=1 myself.  :)




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