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A new method to extract |V_ bc| is proposed based on a sum--rule for semileptonic decays of the B meson. The method relies on much weaker assumptions than previous approaches which are based on heavy--quark symmetry. This sum--rule only relies on the assumption that the virtual c c pair content of the B meson can be neglected. The extraction of the CKM matrix element also requires that the sum--rule saturates in the kinematically accessible region.doi:10.1103/physrevd.50.r21 pmid:10017571 fatcat:tkdgyh4lknbmzmtw6m5iup3acm