Competition area and matches

Contest area dimensions

Contest area dimensions

Official IJF contests such as the Olympics and world championships, etc., are conducted in an 8m x 8m contest area.
Where an adjacent contest area exists, there must be a space of 3 to 4 meter safety zone between the two contest areas.

Contest area floor

Contest area floor

In the 4 major IJF competitions, the previous rule in which a contestant drew a "Shido" for standing in the danger zone for over 5 seconds without performing an attack or defense, has been abolished. Consequently, there is no longer a danger zone, and the floor now has only 2 colors to indicate inbounds and out-of-bounds.
In other IJF competitions (other than the major 4), a red floor color may still be used to indicate the danger zone, and this format is generally used in competitions held in Japan.

Referee and judges

Referee and judges

Contests occur under the supervision of a referee and 2 judges. The referee stands inside the contest area, and the 2 judges sit at the outer corners of the contest area, diagonal to each other.

Contestants

Contestants

The name of the blue-uniform contestant is called first, followed by the name of the white-uniform contestant.
The contest begins with the blue contestant standing on the right side of the referee (as viewed from the referee's position), with the white contestant standing on the left. The blue and white starting lines for the respective blue and white contestants are colored tape affixed to the floor.
Only white uniforms are worn in competitions held in Japan, with the contestants distinguished from each other by red and white belts. (The starting line tapes are also red and white.)