New semidirect MP2 properties/gradient code was developed to speed up MP2 gradient and related jobs , to seriously reduce memory demands and to allow efficient parallel execution . ... New code is triggered on by the presence of METHOD=1 keyword in $MP2 group and its behavior is further controlled by either $MP2 GRDMET=1 $END or $MP2 GRDMET=2 $END (the default) switch. ... Below is the recommended part of the input file to be used with the new MP2 gradient code: . ... PC GAMESS/Firefly' NBO code . ...