Accelerated Move Gen in Null Move

[cdani]

I do this on Andscacs for calculating attacks after every move. Is not null move related, is for every move done. I don't use magic boards, just plain calculations with array of bytes and Bitboards with some precaltulations. The attacks are just overwritten, so there is no problem with this approach.
If someone wants I can put the code here.
I think also that using this idea for move generation will be very expensive.