  For weak decays $B_d^{0}\to \pi\pi$ and $K\bar{K}$ the effects of SU(3)
breaking in coupled-channel final-state interaction effects are discussed in a
Regge framework. It is shown that SU(3) breaking in the inelastic final-state
transitions dramatically affects the phases of the isospin $I=0,1,2$ amplitudes
in the $B_d^{0}$ decays. The effect of the singlet penguin diagram on these
phases is studied. Furthermore, on the example of the $B_d^{0}\to \pi\pi$
decays, the dependence of CP asymmetries on the size of penguin amplitude is
analyzed.
