We study the scattering of open-beauty mesons and Goldstone bosons as predicted by chiral SU(3) Lagrangian. The impact subleading order interactions to systems with $J^P= 0^+$ $J^P=1^+$ quantum numbers is worked out. estimate relevant low-energy coefficients from open-charm sector, for which their values have been determined previously sets QCD lattice data. leading heavy-quark symmetry breakin...