The Delta I=1/2 rule in the chiral limit

We discuss the matching between long-distance and short-distance at next-to -leading in 1/N-c and show how the scheme-dependence from the two-loop reno rmalization group running can be treated. We then use this method to study the three O(p(2)) terms contributing to non-leptonic kaon decays, namely th e usual octet and 27-plet derivative terms as well as the weak mass term us ing the Extended Nambu-Jona-Lasinio model as the low energy approximation. We also discuss subtleties in the momentum routing in the low energy theory and a problem in separating factorizable and non-factorizable contribution s from the Q(6) operator in the chiral limit. We update our earlier results on the B-K parameter as well.