(sec:scfstability.typical)=
# SCF Stability Analysis

The SCF stability will give an indication whether the SCF solution is at
a local minimum or a saddle
point.{cite}`SeegerPopleXVIIIStability,AhlrichsDFTStability` It is
available for RHF/RKS and UHF/UKS. In the latter case, the SCF is
restarted by default using new unrestricted start orbitals if an
instability was detected. For a demonstration, consider the following
input:

```{literalinclude} ../../orca_working_input/C05S06_161.inp
:language: orca
```

The HCORE guess leads to a symmetric/restricted guess, which does not
yield the unrestricted solution. The same is often true for other guess
options. For more details on the stability analysis, see Section
{ref}`sec:scfstabilityanalysis.detailed`.