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Giving this thread specific example never analysed, Barrier Pawn, 
http://www.chessvariants.org/large.dir/kristensens.html, is
so weak he only fulfulls Michael Nelson's '2' and '3' but is essential
to mid-century Kristensen's as blockader. Barrier Pawn can kill no piece
or OrthoPawn only the other Barrier Pawn. Weak-value yet great effect even more determining on Kritstensen's than any other piece-type. How can this be? Basically because there very rarely avails the chance to capture him. Just because B.P. is there, each score runs wholly different channels. The unit must have core-value
Pawn attribute to cause corral effect since he cannot be captured himself
either.  He prevents a corridor unto the King be it rank, file or diagonal.
It all suggests the key Pawn feature -- taking a chance on generalization to other Pawn-types -- stripped of strengthening, is to ward off and prevent any cv in
question being too Mamra-like at that extreme.