CRD is a member league of the International Federation of Flat Track Derby (IFFTD). The IFFTD is a fictional parallel of the real-world Women’s Flat Track Derby Association (WFTDA). As such, CRD plays roller derby as defined by the WFTDA ruleset.

Links to more information:

Welcome to Roller Derby / Complete Rules (WFTDA.com)
WFTDA TV Footage Archives (WFTDA.tv)
Glossary of Official Terminology (WFTDA.com)
Glossary of Derby Slang and Lingo (rollerderbyroster.com)