[computer-go] Rotate the dog or the tail?

[Chris Fant]

> I effectively rotate the pattern as found on the board, giving each of
> the 8 versions a hash code and using the lowest. My pattern DB is
> designed on the assumption I'll need approximately a million "rich"
> patterns, where rich is used to mean they contain information on the
> tactical status of the points and stones.
>
> Needless to say they are not input by hand, and therefore don't include
> don't care points.

This sounds exactly like my system.