OK, it seems to be OK here. But I think I have have been following your
spec. exactly as stated, i.e.you should see TRUE if one or both of the
following is true:
 cell3 is "Cincinatti"
 cell1 is not null and cell2 is not null

and blankotherwise

If what you meant is

"if either cell1is not null,or cell2 is not null, or cell3 is Cincinatti,
print TRUE"

you could try

{ IF { =or(or({ COMPARE "{ cell1 }" <> "" },
{ COMPARE "{ cell2 }" <> "" }),
{ COMPARE "{ cell3 }" = "Cincinatti" }) } = 1 "TEXT" "" }