Glossary of Judo terminology

Judgment of a technique

Judgment of a technique

Ippon gachi (Win by ippon)

[Ippon gachi (Win by ippon) by Nage waza (Throwing techniques)]
When a contestant throws the opponent onto his back with control, considerable force, and speed.
[Ippon gachi (Win by ippon) by Ne waza (Ground techniques)]
When the opponent says "Maitta" (Give up) or gives the Maitta signal (taps the opponent or the floor two times with his arm or leg).
  • When an Osae komi waza (Hold-down techniques) continues for 30 seconds (25 seconds under IJF rules).
  • When the effect of a Shime waza (Strangling techniques) or Kansetsu waza (Joint locks) is clearly indicated (by referee)

Waza-ari (Waza-ari x 2 = Ippon gachi [Win by ippon])

[Waza-ari by Nage waza (Throwing techniques)]
When an executed Waza fell just short of being an "Ippon gachi" (Win by ippon).
[Waza-ari by Ne waza (Ground techniques)]
When an Osae komi waza (Hold-down techniques) is maintained for 25 to 30 seconds (20 to 24 seconds under IJF rules).

Yuko (Effective / Moderate advantage)

[Yuko (Effective / Moderate advantage) by Nage waza (Throwing techniques)]
When an executed Waza fell just short of being a "Waza-ari".
[Yuko (Effective / Moderate advantage) by Ne waza (Ground techniques)]
When an Osae komi waza (Hold-down techniques) is maintained for 20 to 25 seconds (15 to 19 seconds under IJF rules).

Koka (Effect / Minor score) (IJF rules only; currently abolished)

[Koka (Effect / Minor score) by Nage waza (Throwing techniques)]
When a contestant throws the opponent with control, speed, and force, onto one shoulder, his thigh(s), or hips.
[Koka (Effect / Minor score) by Ne waza (Ground techniques)]
When an Osae komi waza (Hold-down techniques) is maintained for 10 to 15 seconds, and when a Waza is judged as being close to a "Yuko" (Effective / Moderate advantage).
* The "Koka" (Effect / Minor score) was abolished as of January 1, 2009.