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. In a rain-soaked war of attrition in which Kansas City forced overtime with a late fourth-quarter drive, Pittsburgh ended the Chiefs' resistance soon after when a Lawrence Timmons interception set up Shaun Suisham's 23-yard winning field goal. ...

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