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Jörg Knappen wrote on Fri, Feb 15, 2013 06:21 PM UTC:
"Unchained bishop" is a rather vague concept at the moment. It is my model to explain the excess value of Queen and Archbishop (Janus/Paladin) compared to their raw components.

The bishop itself is hindered by board geometry and pawn structures (there is always a so-called bad bishop in the team) to move from one good position to another good position. Combining it with some other piece lifts this restriction and some of the value of a queen (specially the queen-chancellor difference, maybe more) comes from the "unchaining" of the bishop. 

Your measurement of the Archbishop's value suggests that adding a knight is sufficient to "unchain" the bishop.

I don't think that colourboundness is a big issue for the bishop. It may be testable by comparing BDD (Duchess or Adjutant) to the Bishop-Panda compound; the latter is not colourbound, the former is, while the pieces are very similar to each other in other respects.

At last, I am interested in the outcome of the R2 tests, since I made a prediction of its value. Depending on the knight's value (300 or 325 cP) it should be one or two quanta of advantage (30 to 60 cP) less than a knight.

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