v2.0 — Astro Build
Grappling Primitives Work-in-Progress
An interactive collection of 247 concepts split into 22 categories that an older black belt has accumulated over the years. Through various visualizations I am trying to make sense of this complex passion of ours; grappling and pinning and escaping and counter-attacking and controlling and killing the space and submitting fellow enthusiasts. Still very much a WIP, some modules are dead-ends, others are R&D. All models are wrong, some are useful. Same for modules I suppose.
Modules
Concept Matrix
All grappling concepts mapped on a 2×2 grid (Self↔Opponent × Mental↔Physical). Hover, click into categories, zoom.
QuadTree Map
4-quadrant treemap: THE MAT · THE MIND · THE DOJO · THE PATH. Category boxes sized by concept count — click to zoom into any category.
Flash Cards
Study and review all 247 concepts with Anki-style flash cards. Filter by category, flip, stage for later.
Skill Assessment
Rate your confidence across 15 grappling areas — short (30q) or full (173q). Results as a bar chart.
Games Hub
Gamified drills and decision tools: pressure scenarios, memory match, centroid estimation, and more.
BJJ Wordle
Guess the grappling term in 6 tries. Supports 4-7 letter words in English, Japanese, and Portuguese.
Articles
Long-form writings on grappling concepts, heuristics, training philosophy, and more. Sourced from the Obsidian vault.
Visual Notes
Hand-drawn diagrams and sketches collected over years of training.
GIF Training
10+ years of technique GIFs as dynamic visual reminders.
Weight Classes
Find your division across IBJJF (Gi & No-Gi), ADCC, and WNO. Includes kg/lbs conversion and gi size calculator.
Belt Dropout
Visualize belt progression and dropout statistics in BJJ.
Beyond Offense & Defense
It's always the same: improve your relative position. Both players, simultaneously.
Training Partners
Map the 10 archetypal training partners — from The Mentor to The Liability. Self-assess and find your closest match.
Grappling Timer
Round timer with configurable duration, rest, and rounds. 3-2-1 countdown, beep cues, auto-cycle.
BJJ Pricing
Monthly memberships and seminar fees worldwide — interactive maps, box plots, and currency conversion across US, UK, EU, Brazil, and Japan.
Breathing Cycles
Guided breathing exercises for pre/post training recovery.