Description

Regulation Category

Unique Category

1. Participant's condition

Corporate or group

Y

Y

1-2

Koma entries shall be one for each competition and can not be exchanged once entered.

Y

Y

1-3

If the Koma producer can not come to throw, organizer will choose substitute thrower.

Y

Y

2. Participation fee

2-1

Koma for the competition (not refundable).

Y

Y

2-2

Entry fee (as per organizers discretion).

Y

Y

3. Specification (see below rule detail)

3-1

The diameter of the Koma shall be φ 20.000 mm (twentie millimeter) or less with respect to the spin axis in the stationary state.

Y

Y

3-2

The total length of the Koma is 60.000 mm (sixty millimeter) or less in a stationary state.

Y

3-3

Verification of dimensions is done by the official ring gauge (inner diameter of 20.001mm) and a commercially available caliper.

Y

3-4

Turning with one hand only.

Y

3-5

Measurement of Koma is performed by the measuring officials appointed at each competition and responsible for the result of the measurement.

Y

Y

4.
Match flow

4-1

The throwers face each other across the Dohyo ring (the cheering team shall wait at the position determined by each competition).

Y

Y

4-2

Prepare to throw when referee calls "Miatte" (If throwers is not ready within 30 seconds, make 1 loss (Refer to 5-3)).

Y

Y

4-3

Throw Koma into the Dohyo ring, when referee calls "Nokotta".

Y

Y

4-4

Decide on winner and loser according to [5. Winning and losing].

Y

Y

5.
Winning or losing (see below rule detail)

5-1

Lose if the Koma goes out of the Dohyo ring or stops before oppnent. Match ends with 2 consecutive wins.

Y

Y

5-2

When Koma is spinning, however the point of contact to the Dohyo ring is not spinning, will be 1 loss.

Y

5-3

When thrower is not ready to throw within 30 seconds after refree calls "miatte", will be 1 loss.

Y

5-4

The deformation of the Koma before referee calls "Hakkyoi Nokotta" (before throwing the Koma into the Dohyo ring) is prohibited, and will be 1 loss.

Y

5-5

The deformed Koma where the diameter and the total length change during spinning, it must return to the original shape when stops spinning. If fails, thrower receives 1 loss regardless of the state of the opponent.

Y

5-6

In the case of obvious delayed actions, unsportsmanship act or disturbing behavior, thrower may receive 1 loss by discretion of referee.

Y

5-7

Throwers can make a complaint when there is a question on the judgment. Then referee makes the final decision. 

Y

Y

6. Prohibited items (see below rule detail)

6-1

Koma that spins at two or more points of contact to Dohyo ring are prohibited.

Y

6-2

Koma that changes spin axis are prohibited.

Y

6-3

Changing or modifying parts/modules after the entry is prohibited.

Y

6-4

After entry, it is prohibited to touch the Koma until your turn to throw. 

Y

Y

6-5

Use of auxiliary tools to assist / encourage spinning of Koma from the outside is prohibited.

Y

6-6

Motorized Koma is prohibited at competition grade G3 or above.

Y

6-7

Tool to deform Koma is prohibited, except repair and restoration.

Y

6-8

Until the first round of battle, Koma will be kept in a case prepared by organizer. Your specially prepared Koma case can also be used.

Y

7.
Dohyo Ring specification

7-1

φ250 millimeter 凹R700millimeter. Made of Chemical wood.

Y

Y

8.The winner's reward

8-1

Winner takes home all the loser's Koma.

Y

Y

9. Supplementary provision

9-1

This rule may change even in the middle of the term.

5.
Winning or losing

Old
5-5

The deformed Koma where the diameter and the total length change during spinning, it must return to the original shape when stops spinning. If fails, thrower receives 1 loss.

Y

Update
5-5

The deformed Koma where the diameter and the total length change during spinning, it must return to the original shape when stops spinning. If fails, thrower receives 1 loss regardless of the state of the opponent.

Y

6. Prohibited items

New 6-7

Tool to deform Koma is prohibited, except repair and restoration.

Y

New 6-8

Specially prepared Koma case can be used until the first round of battle.

Y