sule 66Rule 66.1: Application of the Civil Procedure Rules: Rule 66.2: Action on behalf of the Crown: Rule 66.3: Counterclaims, other additional claims, and set-off: Rule 66.4:Rule 66.1: Application of the Civil Procedure Rules: Rule 66.2: Action on behalf of the Crown: Rule 66.3: Counterclaims, other additional claims, and set-off: Rule 66.4: