4.1 Starting Method

1. For Lego Sumo 1kg and Lego Sumo 3 kg, the Referee places a black frame (eg cardboard) between the Robots in the center of the arena.

2. The operators place their Robots wherever they want. Each Robot must cover the Tawara (white line) at least partially.

3. Robots must be able to see the black frame and not make any movement until it is removed from the referee.

4. The Referee signals the Operators to press the Start button on their Robot so that the Robot go into standby.

5. After the button is pressed the Operators should move away from the arena at least one step back for protection.

6. The Referee counts down 3,2,1, let's go and raises the black frame.

7. Robots should start moving immediately the moment the referee lifts the frame.

8. If a Robot  does not start moving within 5 seconds then it is considered to have lost the match and a victory is given to the opponent.

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4.2 Tawara (white line).

Tawara is the white line around the Dohyo. Tawara line is a part of the Dohyo.

 

Table 2 Dimensions of Tawara by competition classes

 

Class                                    Width of Tawara             

1 kg  LEGO Sumo                         2.5 cm

3 kg LEGO Sumo                         5.0 cm

 

4.3 Yochi

Yochi is an area around the Dohyo with a diameter of at least 100 cm for 1 kg LEGO and at least 250 cm for                 3 kg LEGO competitions. Yochi colour and material can be freely chosen from all colours besides white.

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5 The Robot

 

5.1 Requirements for the robot

5.1.1 Dimension and weight restrictions

 

Table 3 Dimension and weight restrictions

 

Class                               Mass                     Length                 * Width                  * Height

1 kg LEGO Sumo          1.0 kg                        15 cm                        15 cm                     20 cm

3 kg LEGO Sumo       2.0 – 3.0 kg               20 cm                      20 cm                     30 cm

 

* The robot's length and width may expand by a maximum of 10 cm from the required dimensions after the start of the round, but it must remain intact.

* NB! 1 kg LEGO Sumo robot measure box is 15 x 15 cm with +2 mm tolerance. The measure box for 3 kg LEGO Sumo robots is 20 x 20 cm with +2 mm tolerance.

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5.1.2 Autonomous robots – starting the movements

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Table 4 Starting the movements

 

Class                                                 Starting method

  1 kg LEGO Sumo                            5-second timer. The timer can be activated by the operator of the  robot by               3 kg LEGO Sumo                             pressing a button. Same for both categories.

 

5.1.3 Autonomous robots – stopping the movements

 

Table 5 Stopping the movements

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Class                         Stopping method

 1 kg LEGO Sumo    The operator of the robot stops the robot by pressing a button .                                                            3 kg LEGO Sumo   The operator of the robot stops the robot by pressing a button.                       

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5.2 Movements of autonomous robots

The movements of the robot should be designed to detect the movements of the opponent and respond/attack accordingly. If there is any doubt in the autonomy of the robot, the referees have the right to inspect the control logic of the robot.

5.3 Use of remote control devices with autonomous robots

During the competition (round), no remote control devices allowed for Lego Sumo categories.

5.4 Prohibited components of the robot

1. Any components that may disturb the operation of the opponent.

       1.1. For example, flashlights or jamming devices such as IR LEDs intended to saturate the opponents IR sensors.

       1.2. For example, white coloured plow to mislead opponent's colour sensor or light sensor.

2. Any components that may damage or scratch the surface of Dohyo. An exception is when the robots collide.

3. Any components that are designed to damage the opponent.

4. It is forbidden to use any liquids, powders and gas as a weapon against the opponent.

5. It is not allowed to use any inflammable materials in the robot.

6. The robot must not include any throwing devices (for example throwing a net on opponent).

7. The robot must not include ropes of any kind.

8. The robot must not include paper or cardboard parts of any kind.

9. The robot must not include self-glued parts.

10.The robot must not include any parts, which fix it onto the Dohyo (for example, glues, suction cups, etc.).

 

5.5 Additional requirements for 1 kg LEGO Sumo and 3 kg LEGO Sumo classes

1. The robot must be constructed exclusively of the licensed parts of LEGO® original or HiTechnic® . There is an exception for wires used in the robot, wires must be the licenced parts of LEGO® original, HiTechnic® or Mindsensors.

2. The parts used must be in their original condition and must not be modified.

3. The robot must only use batteries or cells that are recommended by LEGO® .

4. The robot must only use motors and sensor that are included in LEGO® Mindstorms, LEGO® Mindstorms,  NXT and LEGO® Spike sets.

 

6 Match principles

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1. The match generally contains three rounds and lasts up to three minutes. The team who will be first to earn two Yuko points (effective points) during the time of the match, will be the winner. Match time is measured during rounds, not between them.

2. If only one Yuko point has been earned by the end of the match time, the winner is the team who earned it. 3. If neither team wins any rounds during the match time, the winner will be announced according to the situation of Yusei (dominance), see paragraph 8.

3. If Yusei cannot be decided or the number of rounds that has been won is the same for both teams, the match time will be extended by three minutes. If one team earns one or more Yuko points during the extended time, then this team will be the winner.

4. The contestants have a maximum of 30 seconds between the rounds to maintain their robot.

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7 Organizing the competition

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7.1 Safety requirements

For safety purposes, the referees and contestant must wear gloves and goggles according to the robot class.

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Table 6 Safety requirements

Class                                     Gloves                   Goggles

1 kg  LEGO Sumo          not required            not required

3 kg LEGO Sumo          not required            not required

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7.2 Starting the match

The match starts with the referee’s signal. The contestants will bow to each other before they enter the area of Dohyo Jyonai. Before each round and with the signal from the referee, the contestants place their robots simultaneously on the Dohyo. The robots must be placed in reciprocal sectors and at least some part of the robot must stay on the white line (see Figure 1 Starting cross). The robots are not allowed to move after they have been placed on the Dohyo. The round begins with a method that has been described for each robot class.

 

Table 7 Start method

Class                                   Starting method

1 kg LEGO Sumo                After the signal of the referee, the operators start the 5-second timer in the robot and        3 kg LEGO Sumo               immediately leave the area of Dohyo Jyonai. The robots may start moving in 5 seconds                                                        after they have received the start command.

 

 1. In case the Dohyo area is scratched or becomes dirty, the referees decide whether to continue the match on the same Dohyo or replace it.

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7.3 Ending the match

1. The referee gives a signal to end the match and stop the robots. The stopping method is separately designated for each class.

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Table 8 Stopping method

 

Class                            Stopping method          

1 kg  LEGO Sumo        The robot is stopped by the operators of the robot.

3 kg LEGO Sumo        The robot is stopped by the operators of the robot.

 

2. The match ends officially after a corresponding signal from the referee. The participants must take their robot from the Dohyo, bow to each other and leave the area of Dohyo Jyonai.

 

7.4 Torinaoshi (repeat of the round)

The round is repeated in the following situations.

1. Both robots are facing each other, and their movement is hindered, or they do not move at all.

2. Both robots fall out of the Dohyo at the same time.

3. Other situations in which it is not possible to determine who has won or lost.

4. If it is not possible to announce the winner after Torinaoshi, the referee may place the robots himself or herself and continue with the match within the allocated time. 

 

7.5 Handling the robots between the matches

For the time between the matches in the same sub-group, the robots must be placed on a table assigned for it and can only be removed from there for the duration of the match. It is forbidden to leave the competition area with the robot between the matches, except for when a corresponding permission has been given (e.g. the robot needs fixing). During the sub-group tournament, it is not allowed to modify the robot. The purpose of this requirement is to guarantee a smooth course of the competition. NB!If the robot cannot be found from the designated table at the right time or if the team itself is not present, the match will result in a loss.

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8 Yuko (effective) point, Shinitai and Yusei (dominance)

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8.1 Yuko (effective) point

The winner is announced in the following situations.

1. If the opponent has been pushed out of the Dohyo (the robot touches the area outside of the Dohyo).

2. If the opponent falls out of the Dohyo and touches the area outside of the Dohyo.

3. In the situation of “Shinitai”.

4. In the situation of “Yusei (dominance)”.

5. If “Keikoku (warning)” is given twice to the opponent.

6. If there is a case of “Hansoku (violation)”.

7. If the winner is announced without a match, the winner earns two Yuko points (if the winner already has one Yuko point, he or she earns only one more). The existing Yuko point(s) of the opponent who lost remain effective.

 

8.2 Shinitai

“Shintai” situation means that one or several wheels of the robot roll out of the Dohyo and the robot is unable to return to the Dohyo. In this case, the opponent earns one Yuko point.

 

8.3 Yusei (dominance)

In a situation of “Yusei” (dominance), the referee may grant a Yuko point to the team according to the strategy, movements and skills of the robot.

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9 Hansoku (violation) and penalty

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9.1 Keikoku (warning)

A contestant who acts as indicated below gets a “Keikoku” (warning). If the contestant gets two Keikokus (warnings), the opponent earns one Yuko point.

1. If the operator or some item of the operator (for example, remote control) ends up in the area of Dohyo Jyonai before the round ending signal of the referee.

2. If the robot moves before the beginning of the round (movement or changing its shape).

3. If the participant violates the requirements for the use of remote control.

4. If the robot is replaced after it is placed on the Dohyo.

5. If the participant does not comply with the safety requirements.

6. In case of any other action that is considered unfair.

 

9.2 Hansoku (violation)

In the following situations the opponent or both parties earn one Yuko point.

1. If some parts, with total weight of more than 5 grams fall off from the robot.

2. If the robot does not move.

3. If both robots move, but do not collide.

4. If the robot is on fire or a situation, which resembles that the robot is on fire.

5. If the participant wants to end the round.

 

9.3 Hansokumake (defeat due to violation)

The participant who violates the following rules, loses the match due to violation.

1. If the contestant fails to show up at the designated Dohyo at the beginning of the match or the participant exceeds the time given for maintenance, see paragraph 6 Match principles.

2. If the contestant sabotages the match. For example, by deliberately breaking or deforming the Dohyo.

3. If the participant violates the requirements provided for “The Robot” in paragraph 5. If the robot does not make autonomous movements.

4. If the participant does not comply with the requirements provided in paragraph 7.1 Safety requirements, even after paragraph 9.1 “Keikoku” (warning).

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9.4 Sikkaku (disqualification)

In the following cases, the participant will be disqualified – he or she must leave the competition and is not added to the list of competition results.

1. If the participant’s robot does not comply with the requirements provided in Paragraph 5. The robot.

2. If the participant behaves in an undignified manner. For example, swears or offends the opponent or the referees. 3. If the participant deliberately injures the opponent.

 

10 Suspending the match

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1. If the participant is injured and the match cannot be continued, the participant may demand the suspension of the match.

2. In the event of the previously described situation, the referees make necessary arrangements for the match to be immediately resumed.

3. If the arrangements do not enable the match to continue, the opponent wins the competition without a match.

 

11 Objections

 

The decisions of the referees are not subject to appeals. Complaints must be submitted during or immediately after the match. If no settlement is reached with the referee, claims must be submitted immediately to the Robotex Head referee. Any later complaints will not be accepted. In case of any conflicts or disputes, the final word will be said by the referees and/or the organisers. NB! Rude behaviour is not tolerated and the team who does not respect the referee’s / head referee’s decisions can be disqualified by the head referee and/or event organisers.

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12 Marking the robots

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12.1 Markings on the robot

The robots must be marked with number stickers (robot number). The stickers are provided by the organisers of the competition. The sticker cannot be placed on the plow of the robot, or on any other component, where it may disturb the work of opponents sensors.

 

13 Changes and cancellations in the rules

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Changes and cancellations made to the rules are adopted by the main organiser of the competition according to the regulation of the regulatory committee of the competition.

 

14 Organizing

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The stadium has at parts uneven lighting and infrared noise, which may disrupt the work of sensors during the competition. For this reason, the organizers recommend using covers or blinds for sensors,testing the sensors under intense lighting conditions or even under direct sunlight to imitate the lighting conditions of the competition arena.

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