Resonance width effects in charged B decays to neutral D mesons and ex
cited kaon states K-i around 1400 MeV are shown to lead to large calcu
lable final state phases. CP asymmetries are defined for any charged B
decay to three pseudoscalar mesons involving intermediate overlapping
resonance states, Asymmetries up to about 10% are found in B+-->Ki+D0
-->(K pi)D-+(0). Decay distributions can be used to determine the weak
phase gamma of the Cabibbo-Kobayashi-Maskawa (CKM) matrix. No separat
ion of the contributions from individual resonances is required.