[Retros] SPGs enabled by A1.3

[andrew buchanan]

> > exactly 7200 legal KK

> Didn't we decide that there were 64^2 - 36*9 - 24*6

> - 4*4 = 3612 legal KK

> positions?


(1) position includes the notion of who has the move.
(2) There are then 24 positions which are illegal due
to DR.
So 3612*2-24=7200.