Hunting for the alpha: $B\to\rho\rho$, $B\to\pi\pi$, $B\to\pi\rho$

The hypothesis of the smallness of penguin contribution to charmless strangeless $B_d (\bar B_d)$ decays allows to determine with high accuracy the value of angle $\alpha$ from the currently available $B\to\rho\rho$, $B\to\pi\pi$ and $B\to\rho\pi$ decay data.