After an appeals court last year revived a malpractice claim against Wachtell, Lipton, Rosen & Katz, it’s back to dual lawsuits in the firm’s long-running litigation against Carl Icahn-controlled CVR Energy Inc.

As neither party wants to give any ground, the litigation is proceeding once more in state and federal court. While the case once looked bleak for CVR, a judge this summer reopened its federal malpractice case against Wachtell and, in the last week, set discovery deadlines far into 2018.