* Leftwich solid in relief of Roethlisberger * Charles gains 100 yards, Chiefs lose sixth straight (Adds details, quotes) Nov 12 (Reuters) - The Pittsburgh Steelers were forced to rely on their defense to eke out a hard-fought 16-13 overtime victory over the Kansas City Chiefs on Monday after the home team lost talismanic quarterback Ben Roethlisberger through injury. ...

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