Polls opened Wednesday in a tense, unpredictable Pakistani election that could be former World Cup cricketer Imran Khan's best shot at power, after a campaign marred by allegations of military interference and a series of deadly attacks.The first voter to enter a polling station in the eastern city of Lahore was a woman, an AFP reporter there saw. More than nine million new female voters have registered for the vote in the deeply patriarchal country.The vote is meant to be a rare democratic transition of power in the nuclear-armed country which has been ruled by the powerful military for roughly half its history.