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> <i>in Raumschach there are possible mating positions with a K & B plus R</i>
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How do you envisage that? Even in a corner the bare King can only be limited to a plane, and the other pieces would have to cover 4 squares in that plane (including the one the bare King is on). A Bishop could check and cover one of those at the same time, but the only way for a Rook to cover the other two would put it in a place that blocks the Bishop from checking.
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I think you need at least two Rooks to have a mate position. And I am not sure that is forcible.