Here's the conclusion from Lorefice v. Italy on the unfairness of a Court of Appeal convicting over an acquittal or other lesser conviction (Google translation):BTW, this was a problem with the Nencini Court of Appeal judgment, but it was not final.
45. The Court has examined the Government's argument that, in the present case, a rehearing of X and Y was not necessary on the grounds that the Court of Appeal, far from merely reassessing their credibility, had carried out a thorough review of the reasoning of the Sciacca Court's judgment, highlighting its shortcomings in the light of all the evidence in the case file (see paragraph 35 above). However, the Court fails to see how this circumstance could relieve the Court of Appeal of its obligation to hear in person the witnesses whose statements, which it was about to interpret in a manner unfavourable to the accused and radically different from that in which the trial judge had understood the case, constituted the main evidence against the accused.
46. In light of the foregoing, the Court considers that the failure of the Palermo Court of Appeal to rehear X, Y, and/or other witnesses before overturning the applicant's acquittal at first instance undermined the fairness of the trial.
47. It follows that there has been a violation of Article 6 § 1 of the Convention.
So the Nencini conviction, if it had not been quashed by Maresca, would have run into an unfairness violation of Convention Article 6, plus, of course, several other violations, before the ECHR.
