I looked at the yudo site ! It has a # of mix up's and miss- information ! Also the k.t.a. is the n.g.b. for sport T.K.D. in korea.Just like the u.s.t.u. in the U.S. They are branches of kukkiwon!! Wonder were they get there info?? Oh well . Do you still have to have a kukki certificate to compete in w.t.f. sanctioned event's ?? It seem's you still do . If that is the case nothing has really changed ! Just my opinion ! MITHIOS