NEW YORK (Reuters) - Former International Monetary Fund chief Dominique Strauss-Kahn struck back this week at the hotel maid who accused him of sexual assault with a sharply worded countersuit claiming defamation, but lawyers say the filing could backfire. Legal experts say Strauss-Kahn's lawsuit could give New York maid Nafissatou Diallo's attorneys greater freedom to present evidence of Strauss-Kahn's sexual history, including allegations involving other women. ...