  We propose a parametrization for two-body nonleptonic $B$ meson decays, in
which the various topologies of amplitudes are counted in terms of powers of
the Wolfenstein parameter $\lambda\sim 0.22$. The weak phases and the
amplitudes are determined by comparing this parametrization with available
measurements. It is possible to obtain the phase $\phi_3$ from the $B\to K\pi$
data up to theoretical uncertainty of $O(\lambda^3)\sim 1%$. The recently
measured $B_d^0\to\pi^0\pi^0$ branching ratio implies a large color-suppressed
or penguin amplitude, and that the extraction of the phase $\phi_2$ from the
$B\to\pi\pi$ data may suffer theoretical uncertainty more than the expected one
of $O(\lambda^2)\sim 5%$.

High Energy Physics - Phenomenology