Judoka.ai Manual
A Systematic Grip Fighting Manual for Judo
Jason A. Hoffman, PhD · Version 2.4 · ~166 min
A physics-based framework for understanding grip fighting: decision frameworks, biomechanics, grip combinations, dimensionality theory, and strategy.
Read Online
Download PDF
Manual Contents
1
The Decision Framework
What to do between hajime and matte
18 min
2
The Grip Continuum
Stability, clearance & contact accounting
20 min
3
Grip Positions
Complete hikite & tsurite inventory
16 min
4
Structural Mechanics
The structural arm & grip quality
10 min
5
The Physics
Force, moment arms, balance & base of support
18 min
6
Grip Combinations
Notation, rating system & offensive/defensive combos
14 min
7
Dimensionality
How grips limit & enable throws
8 min
8
Strategy & Transitions
Offense/defense tradeoff & transition graph
15 min
9
Escapes, Teaching & Reference
Counters, curriculum, glossary & rules
22 min
10
Kenka-Yotsu
The opposite-stance grip fight
25 min
judoka
.ai
Los Gatos, California
Subscribe
Judo tips & app updates. No spam.
© 2026 Judoka Inc.
ver. d156a4a