I think the Archbishop derives a lot of its early power from its knight's move ability to jump over pieces ... this is the same as a knight in conventional chess. On a really crowded board the value of a knight increases, towards the end game the bishop becomes more pwerful as it ususally develops a longer range as there are less pieces to interfer. The Chancellor, I find, als o grows in power through the game, but i am not sure why. In the early game I actually prefer the Archbishop but will always swap for a Chancellor because I know as pieces disappear the Chancellor rises.