Show standards, copy & pasted from Betty Splendens, are-
1. Possess two distinct 'tails' or caudal lobes instead of one, with complete separation to the base of the caudal peduncle.
2. Possess a wider caudal peduncle to support the double lobes.
3. Possess a larger dorsal fin, nearly the size of the anal fin.
4. Their bodies are usually more 'chunky' and often a bit shorter.
5. Bends in the caudal peduncle are expressed to a varying degree in almost all doubletail bettas. These are more easily noticed when viewing the fish from above. Easily seen bends should be faulted; if the bend is not excessive when viewed from above, the fish should not be penalized.