UPDATE 2-Ambac profit boosted by credit derivative gains NEW YORK,
Nov 4 (Reuters) - Bond insurer Ambac Financial Group (ABK.N) posted a quarterly profit of more than $2 billion on accounting gains from credit derivatives, reversing a year-earlier loss and sending its shares up 34 percent. The value of the company's debt fell during the quarter, triggering $2.13 billion in gains from ...