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> There could be a Queen that can move as a pale-square Bishop
> but not a dark-square one. Three questions strike me about
>  such pieces:
> 1	Are they closer to being worth the sum of their parts?
> For example, is the restricted Queen described above worth
> a Rook plus a Bishop, or is it worth less because it can
> find itself on squares where it is temporarily only a Rook?

My estimate is that it would be worth way less than the sum of its parts. A
simplistic guess would be that it is just the average of R (500) and Q
(950), or 725 centi-Pawn. This, however, is probably an under-estimate,
because in actal ply you would favour position where it is on a 'good'
square. But you are unlikely to be able to always put it there. More likely
seems that you can do that 66% of the time. Thus weighting the average
would bring you to 800 cP. Note that an average Bishop is worth 350 (325
for the first, and 375 for the second, completing the pair). So the sum of components would be 850 cP.

Btw, it is not always true that compounds earn a synergy bonus. An Amazon,
for instance, exactly balances a Queen plus a Knight, in opening value.