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Subject: Re: Level of complexity

Author: Russell Reagan

Date: 05:58:30 01/08/04

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On January 07, 2004 at 22:55:36, Ed Trice wrote:

>I think one objective measure is the size of the game, or the branching factor
>of the game tree.

It is, but it is not always a good measure. See below.

>Go is a very large  game (I think it is 19 squared factorial) so that has to be
>up there in terms of difficulty.

The main reason that go is such a hard game for computers is that it is more
difficult to create an evaluation function that is accurate. Go does have a high
branching factor compared to chess (361 from the opening position), but there
are games with much higher branching factors that computers play very well.
Amazons, for instance, has a branching factor of 2176 from the starting
position, but computers have been able to beat the best humans for a long time
now (AFAIK).



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