[Retros] Economy rules

[Joost de Heer]

Hello,

Another question on economy: What's the 'rule of thumb' for promoted 
pieces? I composed a new fairy problem yesterday (again a task...), and 
have two versions: One with 10 black pieces, but with three black 
bishops, one with 11 black pieces, where one of the bishops was replaced 
by a rook and a pawn (both the bishop and the rook/pawn are 
cookstoppers, and not relevant for the theme).

Personally I don't mind the promoted piece, but I have a way to avoid 
it. Should I use that, or doesn't it matter?

And a question: does anyone have the position for the following composition?

W. Seehofer
The Problemist september 2005, #2417
ser-#5, Madrasi+Circe

Joost