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

[Mu-Tsun Tsai]

> Hi! Can the following possibly be sound? Same number of men but still 

> cheaper material.

> 8/7P/5PB1/4B1P1/4NNP1/5k1P/4RP1P/6K1. (13+1). Add one unit. Intension is 

> to add wRf1, last move 0-0. Olli.


For an "add one unit" problem this is fine, but for an "add unit(s)" problem 
(which is the point here, otherwise the record for N1RAl is only 14 units) 
it isn't. I can add wRf1 and wPa2 at the same time.

Mu-Tsun