[Retros] Add units, 18th update

[Alain BROBECKER]

Dear retro friends,

As usual, you will find the adress below,
and it owe's a lot to Andrew's help this time, thanks!
http://abrobecker.free.fr/chess/addunits.pdf

+1KA
+1RA
+1NA
+1KC
+N1RAi


PS: Olli could you give me your birthdate and country, please?