Rule 13. Counterclaim and Crossclaim

(a) Compulsory Counterclaim.
    (1) In General.  A pleading must state as a counterclaim any claim that — at the time of its service — the pleader has against an opposing
party if the claim:
        (A) arises out of the transaction or occurrence that is the subject matter of the opposing party’s claim; and
        (B) does not require adding another party over whom the court cannot acquire jurisdiction.
    (2) Exceptions.  The pleader need not state the claim if:
        (A) when the action was commenced, the claim was the subject of another pending action; or
        (B) the opposing party sued on its claim by attachment or other process that did not establish personal jurisdiction over the
        pleader on that claim, and the pleader does not assert any counterclaim under this rule.

(b) Permissive Counterclaim.  A pleading may state as a counterclaim against an opposing party any claim that is not compulsory.

(c) Relief Sought in a Counterclaim.  A counterclaim need not diminish or defeat the recovery sought by the opposing party. It may request relief that
exceeds in amount or differs in kind from the relief sought by the opposing party.