Custom view - My Open + Group unassigned

Custom view - My Open + Group unassigned

Morning,
Trying to create a view which includes My Open Calls + Unassigned calls for All Groups except 1 (ie Group IS NOT).
So far have tried this:

Group IS NOT "Unwanted group"
AND Technician IS EMPTY
OR Technician IS "ME"
AND Request Status IS NOT "Closed"

Which gives me my calls, but ALL unassigned.
I think I really need an "Assigned To" field that can contain "Unassigned", but there isn't one...
Thanks, John.

                New to ADSelfService Plus?