THE troika is dead, long live the quartet. Pakistan's political history took a new turn when one of the weakest presidents since martial law, Farooq Ahmed Leghari, demonstrated that even a constitutional amendment has not quite truncated his powers. As the executive and judiciary prepared for a head-on collision, the president was catapulted to centrestage and had to balance the conflicting demands. The troika—the president, the prime minister and the army chief—had acquired a new corner: chief justice of Pakistan Sajjad Ali Shah.