General Judo Rules

Safety
 - Intentionally injuring an opponent is not permitted
 - Punching , kicking, and other strike are not allowed.
 - Touching the opponent's face is not allowed.
 - Head dives are not permitted.
 - The technique known as kawazu gake is not permitted.
 - The technique known as kani basami is not permitted.
 - Wearing any hard or metallic object during compettition
    is not permitted. The penalty for violating this rule is
    honsoku make( see Penalties, below). This includes
    wedding rings, earrings, hard-plastic protective gear,
    hair-ties with metalparts, wriswatches, and even 
    press-studs on underpants.
Etiquette
 - Contestants must bow before stepping into the mat.
 - Contestants must bow to each other before and after
    practice or competition.
 - Inappropriate behaviour is not tolerated, such as foul
    language and bodily gestures.
In competition only
 - Stalling is not permitted
 - Adopting a defensive posture is not permitted.
 - It is required to bow to the competition area
 - False attacks are not permitted. They are considered
   attempts to circumvent the prohibition againts
   noncombativity
 - Disregarding the orders of the judge is prohibited.

Scoring
 - Awarding of ippon (一本) ' one full point '. Award of ippon decides
   the winner and ends the match.
 - Awarding of Wazari (技あり) . When Two waza-ari are awarded in the
   same match, it is considered to be same as ippon and the match ends
  ( the judge exclaims ' Waza-ari,awasete ippon' )
 - Awarding of yuko (優子) . One score of waza-ari is considered greater 
   than any number of yuko scores. Yuko is currently the smallest score 
   that can be awarded.
Penalties
Two types of penalties may be awarded. A shido (獅童) is awarded for minor rule infrigements. A shido can also be awarded for a prolonged period of non-aggression. Each time a contestant is awarded a shido, the other contestant gets points according to how many shidos the opponent has, as if he had scored them himself. For the first shido a warning is given to the offending party(this replaces the previos practice of awarding a Koka ), after that the opponent will yoko, wazari and ippon respectively for each shido attained (if the opponent has a wazari, and receives another from the oppnent's shidos,he wins the match). After four shidos are given, the victory is given to the opponent, this is an indirect hansoku-make, and dors not result in expulsion from the tournament. The penalty of hansoku-make( 販促作る) is awarded for major rule infringements, or for accumulating four shidos. If hansoku make is awarded for a major rule infrigement, it result not just in loss of the match, but in expulsion from the tournament.

Competition area
The competition area must be padded with tatami. The minimum allowable size is 14 x 14 meters. The match takes place in an 8 x 8 meter to 10 x 10 meter zone within this larger area. The surrounding space acts as a safety zone. When two competition areas are side by side, there must be at least 3 meter safety zone between them.
Grips
 - Rules related to grips are primarily motivated by the desire tp avoid stalling, to avoid providing undue advantage, or to reduce the chance of injury.
 - Deliberately avoiding gripping is not permitted.
 - In a standing position, it is not permitted to take any grip other than a "normal" grip for more than three to five second without attacking. A "normal" grip is one where the right hand grips some part of the left hand side of the opponent's jacket (and the left hand grips some part of the right hand side of the opponent's jacket). A non-normal grip may involve grabbing the belt, or the trousers, or the wrong side of the jacket. ( A non-"standard" grip is one that does not involve the traditional sleeve/collar grip. There are no time-limits relatedto non-"standard" grips as long as they are not non-"normal").