[Retros] Add units: 6th update and link modified

[Alain BROBECKER]

Dear retro fans,

The name has been changed to addunits.pdf and can be found here:
  http://abrobecker.free.fr/chess/addunits.pdf

I modified N2A, N2A' (i really think it's possible to decrease greatly the
number of pieces, i will modify my program to do so) and N1QAl.
0A was put at the end of the booklet. I added II.

I also wrote the introductory text, and i hope everything is clear and
will be sound. I added two columns, one of them currently empty.
Maybe the DD category can be added, but i'm not sure we shall
seek for that since the other categories are far from complete.

Best regards.





      
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