[Retros] Add units: 16th update - improvement

[Mu-Tsun Tsai]

Although Thierry's attempt didn't work right away, but the idea is pretty good. The following should at least establish a temporary new record, I hope. At least it should solve the problem that the c7 rook cannot be released.

Diagram: 
http://www.janko.at/Retros/d.php?ff=nbB5/nPRp4/1Rp5/kp1P4/p7/Q1P5/PPrPP2P/K7

Stip: Add the missing unit(s).

Mu-Tsun Tsai
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