A computer program for the calculation of the MP2 energy correction fo
r a Kramers-restricted Dirac-Hartree-Fock four component wave-function
is presented. In the spirit of the integral-driven direct SCF scheme
the algorithm has been developed as direct MP2, calculating integrals
as they are needed and avoiding the integral storage bottle-neck of co
nventional MP2. Relativistic MP2 is applied to ground state ((1) Sigma
(+)) CuF, AgF and AuF.