Questione giuridica chiave
Whether the complaint could challenge the cantonal court's factual findings on the basis of arbitrariness without exhausting the Zurich cantonal nullity appeal
Decisione estratta
That challenge was not admissible before the Federal Supreme Court because an available cantonal nullity appeal had not been used.
Motivazione estratta
Under Art. 75(1) BGG, all cantonal remedies must be exhausted. The alleged arbitrary fact-finding could have been raised by nullity complaint under Zurich law, so the Federal Supreme Court could not review it.