Short description of category
The fight takes place between two robots, whose purpose is to push the opponent out of the ring. The robots
have to be fully autonomous, which means, that every decision and operation of the robot depends on its combat
algorithm. During Sumo Challenge tournament fights will be held in several categories:
• Sumo (also known as Standard Sumo)
• Mega Sumo (takes place on a metal ring)
• Mini Sumo+
• Micro Sumo+
• Nano Sumo
• LEGO Sumo
• Humanoid Sumo

Course of the game
Where needed, the competition will take place in two stages: the group stage and the final round.
a) The group stage will be played as a round-robin tournament (all-play-all tournament), the start times
will be provided in the schedule.
b) If necessary, an additional group stage may be played to select participants for the final round.
c) The final round will be played as a single-elimination tournament.

Dohyo (ring) specification
Fights take place on Dohyo (Fig. 1), which is a kind of robot fighting ring.
Several dohyo properties for sumo robots: material – veneered chipboard (powder coated steel for Mega Sumo,
both chipboard and powder coated steel for LEGO Sumo), shape – round, colour – black with white border.

Robots specification Dimensions (during start) and weight

sumo bord
  1. All restrictions refer to the size during start – after the battle begins, the robots can unfold their blades, parts etc. and by doing so, increase their dimensions.
  2. Measuring device is accurate within + 1% of full scale deflection.
  3. In the Lego Sumo class, robots must only consist of LEGO parts (including Mindstorms).

Robots specification requirements and restrictions

  1. The robots must be fully autonomous (no connections to external devices). The only allowed form of
    communication is remote START / STOP performed by a judge.
  2. The devices used in robot must not:
    • disturb the operation of opponent devices (e.g. flash)
    • have dohyo destructive parts (e.g. metal milled wheels)
    • emit liquids, smoke and disperse powders
    • have throwing parts or use projectiles
    • attach in any way to the ground (devices to increase down force, such as a vacuum pump, magnets
    or sticky substances e.g. glue are not allowed)
  3. During competition, robots undergo so-called “paper test” to check if the robot has too sticky wheels.
    The robot is placed on a clean A4 sheet made from 80g / m2 paper, so that all the wheels touch its
    surface, and then it is picked up. Even minimal sheet movement results in disqualifying the robot from
  4. Robots in the Sumo, MiniSumo+, MicroSumo+ categories must have remote START / STOP -the
    standard is described at (38 kHz band). Appropriate electronic
    components can be implemented by contestant or by using “start-up modules”. In case of ambiguity
    or questions related to this type of robot control, please contact the Organization Team in advance.
  5. In the Humanoid Sumo category, constructions must meet a number of additional restrictions
    specific to this class of robots. See Attachment File 1 for more information.

Qualifying process

  • To be qualified, robot must meet all the conditions from mentioned in 4. Each robot has to undergo official
    measurement and weighing before battles in its category will start.
  • Doping tests
    During the competition, random weighing of robots may happen in order to prevent possible attempts of
    cheating. Moreover, robots may undergo additional “paper tests” before fights.
  • Rules
    Robots are operated by a selected team member. The duel consists of three rounds (it ends when two rounds
    are won by one player).
    • Start of the duel
      • Start position of the robots will be determined by using small crosses made of plexiglass. The cross
      divides dohyo into four quadrants – the robots must be placed in opposite quadrants, parallel to each
      other, their direction is indicated by the arrows on the cross (Fig. 2).

Figure 2 Start position of the robots
• Position of the robots has to be approved by the judge, who can ask for positioning robots further from
each other (this applies especially to Mini Sumo +).

    • About the game
      • In the Sumo/ MiniSumo+/ MicroSumo+ categories, robots have to start immediately after the
      START command sent by the referee’s remote control.
      • If one of the robots fails to start (or starts with a delay of more than 500 ms), the round is stopped
      and then repeated.
      • In the Nano Sumo/ Lego Sumo /Humanoid Sumo categories, robots have to start at the earliest 5
      seconds after the verbal START command given by the judge. During this time they cannot take any
      action (e.g. movement, lowering their angled blades or spikes, scanning the area for an opponent).
      • One round cannot last longer than 1 minute – after this time it is repeated.
      • The end of the round is announced by the judge.
      • The winner is the player who wins more rounds during the game.
    • Point scoring system (does not apply to the Humanoid Sumo category)
      Robot wins the fight when:
      • It pushes the opponent out of the ring (the opponent touches the ground outside the ring with any
      of its parts).
      • The opponent is out of the ring.
      • Contestant does not appear on the judge’s call for a battle (over 2 minutes).
      • The opponent’s operator receives 2 warnings.
      * Point scoring system for Humanoid Sumo category is included in Attachment File 1.
    • Warnings
      You can receive a warning for:
      • Entering the prohibited area (each point within a distance shorter than specified in the regulations)
      before the end of the fight is announced by the judge.
      • Too long (over 1 minute) preparations for the next round in a duel.
      • When the robot was activated before the beginning of the fight.
    • Exceptions
      • When for a long time robots do not show an advantage over the opponent (e.g. deadlock) the judge
      may stop the fight if both participants will agree and announce the tie; in case of disagreement the
      fight lasts 2 minutes.
      • If both robots fell from the ring and it is not possible to determine which robot was first to touch the
      ground, the judge stops the fight and it is being repeated.
      • In case of any unspecified situations, the judge’s decision is indisputable.
    • Maintenance break
      When the robot breaks down, participant can ask for one longer break during the duel. The length of
      the break will depend on the schedule of the competition and will last at least 5 minutes.

Final provisions
It is not allowed to submit to the competition constructions, that are officially being sold. If the robot is a
modified version of the finished structure, please contact the Organizers to agree on the rules of participation.
If the participant does not inform the Organizers before the competition, he or she will be disqualified.
Competitions can take place in varying lighting conditions, which is why robotic sensors should be properly
protected against the adverse effects of light.
Robot is perceived as an inseparable object – no element (except the battery) can be used in another robot.
All situations not described in the regulations are solved by the Chief Judge.
The Chief Judge’s decision is final and indisputable.
In case of a small number of robots, the organizers can decide to award only one prize.
Organizers have the right to make minor changes to the regulations until the start of the competition – all will
be listed at the beginning of the regulations.