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Subject: Re: is Chess a Hard NP?

Author: Russell Reagan

Date: 00:50:37 01/21/05

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On January 20, 2005 at 23:18:01, Dann Corbit wrote:

>On the other hand, is Tic-Tac-Toe exponential?
>Strictly speaking -- yes it is.
>But even the lamest computer can solve it minimax in a fraction of a second.
>
>So there can come to be some point where it no longer matters that it is
>exponential because the compute speed has caught up to the size of the problem
>and it has really become O(1).
>
>So it is not something that we can just dismiss as irrelevant.  I think this is
>especially the case when the input is fixed (as in the case of an adversarial
>game) rather than sorting or something where we might want to sort the cards in
>a deck, but we might also want to sort all the CTAG sequences in Chrysanthemum
>DNA.


Isn't O-notation used for analyzing situations where N can grow to infinity?
Describing 3x3 tic-tac-toe in terms of O-notation doesn't really make sense to
me. For 3x3 tic-tac-toe, what is N? At least for chess, N is practically
infinity, for now.



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