Traditional Caudal - The caudal fin may be either spade shaped or rounded. If spade-shaped the point should be at the midpoint of the fin. A caudal spread of 180° is preferred, but differs from the requirements for other show Betta and for other plakat classes in two respects. First the edges of the caudal fin are expected to be rounded rather than shaped in the configuration of the letter D. Second, the 180° caudal should not be achieved by greater than primary or secondary branching of the caudal fin rays. Thus the caudal spread in a traditional plakat is achieved by an increase in the volume of tissue between rays rather than by an increase in fin ray branching.
I noticed the first three examples of traditional PK provided by Junglist appear, to my admittedly poor eyesight, to have 2-ray branching. The asymmetrical PK and symmetrical PK obviously have 4-ray. Is this a consideration?
The example provided above is 4-ray and is labeled traditional.
(I really need to join IBC and get a rulebook.)