***,OH
include procedures
geometry={O;H,O,1.83}
set,symmetry=[2,3,1],spin=1   ! 2Pix, 2Piy, and 2Sigma+ states (specifying spin=1 is optional)
runcas                    ! SA-CASSCF for all three states
set,symmetry=[2,1]            ! remove Piy
runmrci                   ! MRCI for 2Pix and 2Sigma+