  A method to extract Standard Model(SM) CP phases involving B decays is
presented. The method involves a pair of decays where one decay receives a
significant $b \to d$ penguin contribution while the second has a significant
$b \to s$ penguin contribution, but is dominated by a single amplitude. SM CP
phase information is obtained using the fact that the $b \to s$ transition
amplitude is related by SU(3) to a piece of the amplitude with the $b \to d$
transition. If there is significant new physics only in $b \to s$ transitions
and not in $b \to d$ transitions then this method can be used to measure new
physics(NP) phases.
