  The S66 non-covalent interactions are studied through localized
coupled-cluster methods and general LNO-CCSD(T)-based composite schemes. Very
small RMS deviations (\leq 0.05 kcal/mol) for the low-cost composite approaches
from the SILVER reference interaction energies of S66 indicate that we can
safely avoid carrying out the largest basis set calculations with veryVeryTight
thresholds, and apply instead additivity corrections in smaller basis sets.
Interestingly, the counterpoise corrections do not have an appreciable effect
on the composite schemes. These findings may prove useful for intermolecular
and intramolecular NCIs of larger systems.
