[Retros] Add units: 17th update (1RA)

[Mu-Tsun Tsai]

> Has anyone made any headway with my own 1NA, please? There are lots of

> promising tries, but I think none of them work for a single reason.


That one looks OK to me, but as you said, it is quite complicated, so I'm 
not 100% sure about its correctness, although I tend to believe so.

Mainly there're two different tires, one with a bishop and the other with a 
knight, but they won't work since the retro play will simply become endless 
repetition.


Mu-Tsun