[Retros] Add units: 9th update

[Alain BROBECKER]

Err, this time i'm ashamed... :(
There was a typo error in my correction of previous typo error
in problem N1QCi. I hope now everything is well, but i
wouldn't be surprised other errors lie in the booklet:
  http://abrobecker.free.fr/chess/addunits.pdf

All apologies to Werner and Andrey, authors of N1QCi.

Best regards, Alain


Alain Brobecker (abrobecker at yahoo.com) |_  _  _ |_
http://abrobecker.free.fr/             |_)(_|(_|| ) of  Arm's Tech