15-6-13(b). Permissive counterclaims.
A pleading may state as a counterclaim any claim against an opposing party not arising out of the transaction or occurrence that is the subject matter of the opposing party's claim.
Source: SDC 1939 & Supp 1960, §33.0911; SD RCP, Rule 13 (b), as adopted by Sup. Ct. Order March 29, 1966, effective July 1, 1966.