  Taking into account the recent measurements of the branching ratios and CP
asymmetries in the $B \to \pi\pi$ decays by the BABAR and BELLE collaborations,
an amplitude analysis based on the isospin symmetry is reported. These data
allow to get an independent determination of the CKM unitarity-triangle angle
$\gamma$. One of the best-fit solutions gives the range $\gamma = (65 \pm
5)^\circ$, in excellent agreement with the global CKM fit within the Standard
Model. The other parameters from this fit confirm the earlier analyses that the
data on $B \to \pi\pi$ decays require various topological amplitudes
(neglecting the electroweak ones) to be of comparable magnitude with large
strong-phase differences.
