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@ Greg: I thought of a way to underpromote to a Chancellor just this morning, but felt it was too easy and not what you were initially doubting was feasible in the way of a justifiable underpromotion. I'll see if I can remember what I thought of.

Meanwhile, here's another Seirawan Chess possible position, this time with an underpromotion to a rook (I feel I thought of some other example position that was more crystal clear long ago, though); White's easiest way to win (if nothing else) is 1.Pe7xd8=R since if White chooses a B, Archbishop or a Q instead then 1...ac8-g4+ allows Black to at the least bother White for a while, since taking the archbishop stalemates Black. If White chooses a Chancellor instead then 1...ac8-b7+ may prolong the struggle considerably since taking the archbishop with either Chancellor stalemates Black.