I've noticed some people didn't understand the law that was concerned in this case.
it's right that the quarrel between nader and razieh happend at nader house and nader could forced the razieh to go out, but another fact that was concerned was about miscarrying. if nader had known that razie was pregnant, according to iranian law, he should have paid a heavy fine so this is about the money not anything else. whole the story revolves it
Not being Iranian, I have no knowledge of Iranian law. But I found it odd that the judge narrowed the whole case down to the single element of whether Nader knew that Razieh was pregnant, ignoring other elements that were equally important, if not more so.
In court cases (western ones at least), a verdict of murder rests on whether the act was intentional. It was fairly obvious to all the parties, including the judge – yet brought up by none, other than Razieh's sister towards the end – that Nader had no intent of actually pushing Razieh down the stairs. Thus the accusation (in my western opinion) ought to have been culpable recklessness in an accident, instead of murder.
And then there's Nader's defence that, technically, he could not have pushed Razieh in the direction of the stairs going downward. Anyone who watches the particular scene can see that this is correct. Nader pushed Razieh through the narrow opening of the almost closed door, which can only mean to one side. In this case it was to the right (seen from inside the apartment), in the direction of the stairs going upwards. Of course the judge did not have access to the film, but one of his assistants was (or should have been) present at Nader's reconstruction, where this was made obvious.