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I tested the Adjutant (BDD), and it is _strong_. A pair of Adjutants beat a
pair of Rooks by 82% when I program its value (slightly) above that of a
Rook, and by 72% when I program it below a Rook. (No doubt because it
starts pursuing trading them for Rooks, which is a waste.) Only 160-190
games so far, but that should have a standard error of ~3%, so all very
significant. An Adjutant might on thus be worth about R+P.

The fact that it is a color-bound piece makes the Adjutant quite
interesting: there should be a pair bonus involved, and because the
Adjutant is quite strong, the pair bonus should also be large. This
effectively makes the first Adjutant much more valuable than the second.
(This explains why building in the drive to trade it for Rook is unusually
detrimental.) So it could be that Adjutant + pair bonus is even larger than R+P, while R < solitary Adjutant < R+P.

It would also be of funamental interest to see how pair bonuses behave between different color-bound pieces. E.g. when you have an Adjutant on the light squares, it stands to reason that a Bishop on the dark squares would be worth more than one that is also confined to the light squares. But would the difference be larger or bigger than when the Adjutant would have been another Bishop?

Too bad Fairy-Max has no pair-awareness, making it a poor tool for answering such questions. Perhaps I should make a version that uses a material table, in stead of strictly additive piece values.