  The inclusive decay rate b to ccs is enhanced considerably due to
perturbative QCD corrections. We recalculate the dominant part of the NLO-QCD
corrections, because they cannot be reconstructed from the literature and we
give the full expressions in this paper. Further we include some previously
neglected corrections originating from penguin diagrams. Combined with the
impressive progress in the accurate determination of input parameters like
charm quark mass, bottom quark mass and CKM parameters, this enables us to make
a very precise prediction of the corresponding branching ratio Br (b to ccs) =
(23 pm 2)%. This result is an essential ingredient for a model and even decay
channel independent search for new physics effects in B decays.
