On Wed, 2008-12-10 at 12:39 -0800, terry mcintyre wrote:
> Most of those 55 distinct moves are rarely used in the opening. I once
> heard a simple rule which seems to cover just about everything
> interesting: "consider only moves which are on the 3rd and 4th lines,
> and/or within a manhattan distance of n, for some small n, of some
> other stone already on the board." If memory serves, David Fotland
> mentioned this at the Portland Congress. Some players favor opening
> moves on the fifth line, however.

If you consider the 5th line as valid, this works on 9x9 too.  The 5th
line in 9x9 is the single point e5.

- Don


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