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Rococo is another famous CV that we arrived at a piece-type density of 10%:
http://www.chessvariants.org/index/displaycomment.php?commentid=5613. Rim squares are available to both sides and not really occupied half the time at all, but would seem to have half the impact in strategic planning; so naturally count them as 1/2.  
http://www.chessvariants.org/other.dir/rococo.html.
If happening to count them as 0.4 or 0.6, the calculations they appear in are not changed that much. Piece-values estimates, like mine here for Rococo or M. Nelson's in another comment of ''all messages,'' have in a way been overtaken by potential of computer analyses, if they were not already in 2004.  The now six-year-old formula for game length ought to be revisited.  In the expanded form, for clarity to compare any cv with any other cv, M, Moves expected, depends on board size, piece-type density, power density, and exchange gradient. The formula is a reason we want to get piece-type densities.