About THRI
THRI is a modern, modular grading system for preservation of the jujutsu system, techniques and standard of the deJong Self Defence Schools syllabus, based on Tsutsumi Hozan Ryu Jujutsu
THRI is a grading system framework started in 2015 by Sensei Dan Newcombe and Sensei Wim Mallens Principal Tadashii-do Karate and JiuJitsu to standardise and coordinate the establishment of the syllabus in Rotterdam. Both are long term (30+years) students of Shihan Jan and Hans de Jong.
