  I report on three recent topics from the field of two-body nonleptonic decays
of $B_{(s)}$ mesons. The computation of two-loop NNLO corrections to the
leading penguin amplitudes in QCD factorisation, puzzles that have emerged in
colour-allowed tree-level decays to heavy-light final states, and a combination
of QCD factorisation with $SU(3)$ flavour symmetry to estimate the size of
weak-annihilation amplitudes.

High Energy Physics - Phenomenology