1. History & Origins

Judo was founded in 1882 by Jigoro Kano (1860–1938) at the Kodokan in Tokyo, Japan.

  • Roots in Jujutsu: Kano studied classic Jujutsu styles—specifically Tenjin Shinyo-ryu (striking and joint locking/grappling) and Kito-ryu (throwing mechanics). He excised high-risk, dangerous battlefield techniques (such as small-joint destruction and direct ocular attacks) and refined the remaining moves into a safe, repeatable method of realistic free-practice (Randori).
  • The Metamorphosis: By shifting the suffix from Jutsu (art/technique of combat) to Do (way/path of life), Kano transformed samurai battlefield survival skills into a vehicle for individual self-improvement and societal benefit.
  • Modern Evolution: Judo became the first Asian martial art to enter the Olympic Games, debuting at Tokyo in 1964.

2. Core Philosophical Principles

All techniques and training in Judo flow from two fundamental adages:

  1. Seiryoku Zenyo (精力善用) — Maximum Efficiency, Minimum Effort
    • Meaning: Utilizing your energy (physical and mental) in the most effective manner. Rather than resisting an opponent’s force directly, you yield to it, redirecting their momentum to unbalance them.
  2. Jita Kyoei (自他共栄) — Mutual Welfare and Benefit
    • Meaning: Progress cannot occur in isolation. Your training partner (Uke) is not an enemy to destroy, but a collaborator without whom you cannot hone your craft. Taking care of your partner ensures long-term mutual growth.

3. General Japanese Dojo Terminology

TermKanjiDefinition
Dojo道場Place of the Way; the training hall.
Rei礼Bow; courtesy and respect.
Sensei先生Teacher / Instructor (“one who came before”).
Tori取The executor/thrower of the technique.
Uke受The receiver/person taking the fall.
Ukemi受身Breakfall techniques (falling safely).
Gi (Judogi)柔道着The uniform worn during practice.
Obi帯The belt representing rank.
Randori乱取りFree practice / sparring.
Shiai試合Formal competition match.
Hajime始め“Begin!” (referee command).
Matte待った“Wait / Stop!” (referee command).
Ippon一本Full point; immediate victory.
Waza-ari技ありHalf point. Two Waza-ari make Ippon (Waza-ari Awasete Ippon).

4. Mechanical & Anatomical Terminology

Understanding the execution of any Judo technique relies on breaking down three core mechanical phases:

  • Kuzushi (崩し) — Off-balancing: Breaking your opponent’s balance in one of eight directions (Happo-no-Kuzushi).
  • Tsukuri (作り) — Entry/Positioning: Moving your body into the optimal structural position to execute the throw.
  • Kake (掛け) — Execution: Completing the throw with force, speed, and control.

Categorization of Techniques (Waza)

  • Nage-Waza (投げ技) — Throwing Techniques:
    • Tachi-Waza (Standing): Te-waza (Hand), Koshi-waza (Hip), Ashi-waza (Foot/Leg).
    • Sutemi-Waza (Sacrifice Throws): Ma-sutemi (Rear sacrifice), Yoko-sutemi (Side sacrifice).
  • Katame-Waza (固技) — Grappling Techniques:
    • Osaekomi-Waza: Pinning / Hold-down techniques.
    • Shime-Waza: Choking / Strangulation techniques.
    • Kansetsu-Waza: Joint locks (in Judo, limited strictly to the elbow joint).

5. Technical Syllabus – Gokyo no Waza

Phase 1: Beginner (6th – 5th Kyu) — Dai-Ikkyo (Group 1)

Focus: Basic off-balancing, foot sweep timing, big hip movements, and fundamental pins.

Throws (Nage-Waza)

  1. De-ashi-harai: Advancing foot sweep.
  2. Hiza-guruma: Knee wheel.
  3. Sasae-tsurikomi-ashi: Supporting foot lifting-pulling ankle throw.
  4. Uki-goshi: Floating hip throw.
  5. O-soto-gari: Major outer reap.
  6. O-goshi: Major hip throw.
  7. O-uchi-gari: Major inner reap.
  8. Ippon / Morote Seoi-nage: One-arm / Two-hand shoulder throw.

Pinning Techniques (Osaekomi-Waza)

  1. Hon-kesa-gatame: Basic scarf hold.
  2. Kuzure-kesa-gatame: Modified scarf hold.
  3. Kami-shiho-gatame: Upper four-quarter hold.
  4. Yoko-shiho-gatame: Side four-quarter hold.

Phase 2: Intermedate (4th Kyu) — Dai-Nikyo (Group 2)

Focus: Directional change, rotation, compound entries, and basic choking.

Throws (Nage-Waza)

  1. Ko-soto-gari: Minor outer reap.
  2. Ko-uchi-gari: Minor inner reap.
  3. Koshi-guruma: Hip wheel.
  4. Tsurikomi-goshi: Lifting-pulling hip throw.
  5. Okuri-ashi-harai: Sliding foot sweep.
  6. Tai-otoshi: Body drop.
  7. Harai-goshi: Sweeping hip throw.
  8. Uchi-mata: Inner thigh throw.

Chokes & Locks (Shime-Waza & Kansetsu-Waza)

  1. Nami-juji-jime: Normal cross choke.
  2. Gyaku-juji-jime: Reverse cross choke.
  3. Kata-juji-jime: Half cross choke.
  4. Ude-hishigi-juji-gatame: Cross-body armbar (Elbow joint lock).

Phase 3: Intermediate to Advanced (3rd Kyu) — Dai-Sankyo (Group 3)

Focus: Sacrifice techniques (Sutemi-Waza), dynamic footwork, advanced pin variations.

Throws (Nage-Waza)

  1. Ko-soto-gake: Minor outer hook.
  2. Tsuri-goshi: Lifting hip throw.
  3. Yoko-otoshi: Side drop.
  4. Ashi-guruma: Leg wheel.
  5. Hane-goshi: Spring hip throw.
  6. Harai-tsurikomi-ashi: Sweeping lifting-pulling ankle throw.
  7. Tomoe-nage: Circular / Stomach throw (Rear sacrifice).
  8. Kata-guruma: Shoulder wheel.

Submissions & Control

  1. Hadaka-jime: Naked choke (rear strangle).
  2. Okuri-eri-jime: Sliding collar strangle.
  3. Kata-ha-jime: Single-wing strangle.
  4. Ude-garami: Figure-four armlock (Keylock / Kimura).
  5. Tate-shiho-gatame: Straight four-quarter hold (Mount pin).

Phase 4: Advanced (2nd Kyu) — Dai-Yonkyo (Groups 4)

Focus: Counter-throwing, re-direction, high-amplitude sacrifice throws, complex turnover combinations.

Throws (Nage-Waza)

  1. Sumi-gaeshi: Corner reversal (sacrifice throw).
  2. Tani-otoshi: Valley drop.
  3. Hane-makikomi: Springing wraparound throw.
  4. Sukui-nage: Scoop throw.
  5. Utsuri-goshi: Changing hip throw (counter throw).
  6. O-guruma: Major wheel.
  7. Soto-makikomi: Outer wraparound throw.
  8. Uki-otoshi: Floating drop.

Phase 5: Advanced (1st Kyu) — Dai-Gokyo (Groups 5)

Focus: Counter-throwing, re-direction, high amplitude sacrifice throwa, complex turnover combinations.

  1. O-soto-guruma: Major outer wheel.
  2. Uki-waza: Floating sacrifice.
  3. Yoko-wakare: Side separation.
  4. Yoko-guruma: Side wheel.
  5. Ushiro-goshi: Rear hip counter.
  6. Ura-nage: Rear throw (Suplex).
  7. Sumi-otoshi: Corner drop.
  8. Yoko-gake: Side hook.

Advanced Chokes & Joint Locks

  1. Sankaku-jime: Triangle choke (using legs).
  2. Koshi-jime: Hip strangle (clock choke).
  3. Ude-hishigi-ude-gatame: Arm-lock armbar.
  4. Ude-hishigi-waki-gatame: Armpit armlock.
  5. Ude-hishigi-hara-gatame: Stomach armlock.

Phase 6: Now that you understand the fundamentals (Shodan to Godan) — Kata & Mastery

Focus: Perfection of movement, deep understanding of mechanics, formal Kata execution, and practical application under high stress.

Kodokan Kata Requirements

  • Nage-no-Kata: Forms of Throwing (15 throws executed right and left side showing ideal Kuzushi, Tsukuri, Kake).
  • Katame-no-Kata: Forms of Grappling (15 techniques covering Pins, Chokes, and Armlocks).
  • Ju-no-Kata: Forms of Gentleness/Flexibility (Expressing yielding principles without power).
  • Kime-no-Kata & Goshin-jutsu: Self-defense forms against strikes, knives, and weapons.

Judo Competition: Mastering Judo contest rules under current International Judo Federation (IJF) standards requires a clear grasp of scoring criteria, penalty structure, boundary rules, and official gestures.

1. Scoring System (Tachi-Waza & Ne-Waza)

Modern competition recognizes two scores:

Ippon (一本) — Immediate Match Victory

  • Standing Throw (Tachi-Waza):Awarded when a throw demonstrates four core criteria: Control, Power, Speed, and landing largely on the flat back.
  • Hold-Down (Osaekomi): Maintaining continuous pin control for 20 seconds.
  • Submission (Shime-Waza / Kansetsu-Waza): Opponent taps twice (by hand or foot) or submits verbally (Maitta), or the referee stops the contest due to loss of consciousness or hyperextension.

Waza-ari (技あり) — Half-Point

  • Standing Throw (Tachi-Waza):Execution lacks one of the four Ippon criteria (e.g., landing on the side/one shoulder at $90^\circ$ or more to the rear of the shoulder line).
  • Hold-Down (Osaekomi): Maintaining continuous pin control for 10 to 19 seconds.
  • Accumulation:Two Waza-ari equal Ippon (Waza-ari Awasete Ippon) and end the match.

2. Penalty Structure (Shido & Hansoku-Make)

Penalties do not award points to the opponent; they are tracked separately.

PenaltyActionEffect
Shido (指導)Minor InfractionWarning. 3 Shidos = Disqualification (Hansoku-Make).
Hansoku-Make (反則負け)Serious Infraction / Direct DQImmediate loss of the match. (Direct DQ for unsportsmanlike conduct or dangerous actions disqualifies the athlete from the tournament entirely).

Common Shido Infractions

  • Non-Combativity / Stalling:Refusing to take a grip or taking a defensive posture without attacking for more than 5 seconds.
  • False Attacks: Initiating a throw without balance disruption (Kuzushi) simply to avoid a stalling penalty.
  • Unorthodox Grips:Cross-grip, belt-grip, pistol grip, or pocket grip held without an immediate attack.
  • Leg Grabs (Tachi-Waza):Touching or grabbing the opponent’s legs during standing action.
  • Stepping Out: Stepping outside the contest area with one or both feet without initiating a valid technique.

Direct Hansoku-Make Violations

  • Head Diving: Landing on the top of the head during a throwing entry (e.g., diving forward on Uchi-mata).
  • Bridging:Voluntarily landing in a bridge position to avoid falling on the back (evaluated as Ippon for the thrower).
  • Forbidden Locks: Applying joint locks anywhere other than the elbow joint, or snapping joint locks in standing position (Tachi-waza).

3. Key Refereeing Calls & Commands

  • Hajime (始め):“Begin!”.
  • Matte (待った): “Pause / Freeze action” (Players quickly return to starting line and fix uniform).
  • Osaekomi (抑え込み): “Hold is on!” (Starts pin timer).
  • Toketa (解けた): “Hold is broken!” (Stops pin timer).
  • Sono-mama (そのまま): “Do not move!” (Used to freeze ground action to check a situation or issue a warning without resetting positions).
  • Yoshi (よし): “Resume action!” (Unfreezes action following Sono-mama).
  • Sore-made (それまで):“End of contest!”.

4. Match Time & Golden Score

  • Regular Time:4 minutes (Seniors) of active clock time.
  • Golden Score:If scores are tied at the end of regular time, the match enters unlimited sudden-death Golden Score.
    • The first contestant to earn a score (Waza-ari/Ippon) or whose opponent receives a penalizing Shido disparity immediately wins.