[Retros] Add units: 1QA (16pieces)

[Mu-Tsun Tsai]

Using a bishop as retracting piece for black is a great idea. I believe 
that, together with my design, I can replace a rook by a bishop.

(Andrew Buchanann + Mu-Tsun Tsai + Dream Yeh)
Diagram:
http://www.janko.at/Retros/d.php?ff=8/PP6/kPB5/NRP5/2KN4/P7/RPP4P/1b6
(14+2)

Intended solution: +wQb3

Mu-Tsun