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"A clusterbot is a machine that's made of two or more parts, which gives our opponent not just one problem to deal with, but multiple issues about how you fight something that's in two places at once."
— Alex Botwright explains the logic behind Crackers 'n' Smash

Clusterbots, first introduced in the fourth series of Robot Wars, are a special type of competitor robot which consist of two or more greatly identical robots rather than one. They would enter the arena together as one machine, before separating and fighting as separate robots when the battle began.

Clusterbots were rather uncommon in Robot Wars, with only eight entries of the conventional variety having competed in any domestic series to date. The most successful of these are joint-pioneer and Series 4 Heat-Finalist Gemini, Dutch Series 2 Heat-Finalist √3 and Extreme 2 Middleweight Finalist Typhoon Twins. Another clusterbot, Share + Destroy, was also planned to enter Series 4, but failed to qualify.

RulesEdit

Gemini immobilised

Once one half of Gemini was immobilised on an arena spike, both halves were eliminated as one machine

Ex2MiddleweightRound1.2.1

As a Middleweight clusterbot, Typhoon Twins were able to continue fighting despite one half falling into the pit

The rules governed for clusterbots state that while there are no limits for the number of robots they can be made out of, the combined weight of each robot must be within the given weight limit for each category (for example, 79.4kg, 100kg or 110kg for heavyweights). Although not mentioned in the build rules themselves, the number of clusterbot segments allowed in the arena at once is also limited by the number of team members available to drive them. As of Series 10, the maximum is four parts for a team consisting of four members, with the option to use any extra segments interchangeably. In the original series, clusterbots were also required to be attached to each other before the battle started, although this rule was not applied to the reboot.

Clusterbots also had to face additional rules in terms of immobilisation. The original rule stated that if one of the robots was rendered immobile, then the entire robot was deemed immobilised, and therefore eliminated. As a result, robots that fought them would often concentrate on defeating one half of the robot. A key example is Tornado during its Series 4 Heat Final against Gemini, which focused on impaling one half on an arena spike in order to eliminate it.

After Series 4, the rules were revised so that 50% of the robot in terms of weight had to be immobilised in order for the clusterbot to be eliminated. Whilst this largely unaffected most clusterbots at the time, as they generally consisted of two robots of equal weight, it did affect the Dutch three-part clusterbot √3, as it was still able to win its battle against Pika 3 on a Judges' decision even after Matilda threw one of the robots out of the arena; had this occured in Series 4 or earlier, it would have counted as an immobilisation. Although consistently applied in the main heavyweight competitions, this rule did not appear to strictly enforced in the lower weight classes, with both Legion and Typhoon Twins continuing to fight even after one half had become immobilised or pitted.

In Series 9, the rule was changed so that 60% of a robot must be defeated for the whole robot to be considered immobile. Competitor robot Crackers 'n' Smash capitalised on this by having each half of the robot weigh 50kg and 60kg respectively - as neither part of the robot weighs more than 66kg, both halves of the robot would need to become immobilised before Crackers 'n' Smash can be deemed immobile.

Interestingly, clusterbots were not allowed to fight in melees prior to Series 4 due to radio interference issues.

MinibotsEdit

A similar concept to the clusterbot exists in the form of minibots. These involve small robots that competed alongside the main competitor, which were significantly lighter, and were neither required to be attached to the main competitor at the start of the battle nor to feature an active weapon.

Minibots were typically used to distract and disrupt an opponent's movements, interfering with their attacks, but were considerably more fragile than standard clusterbots due to their smaller size. As a result, minibots were largely considered to be sacrificial, and would not usually fight again if they became severely damaged in battle.

The first robot to use a minibot, although the concept was not named as such at the time, was Psycho Chicken in Robot Wars: Extreme Warriors, with its egg-shaped minibot, 'Scramble'. However, the concept would not be explored again until the UK's eighth series, with two minibots appearing as part of Nuts, and one ('The Hatchling') accompanying Terror Turtle.

Advantages and DisadvantagesEdit

AdvantagesEdit

ODT-Zero vs √3

All three parts of √3 try to push ODT-Zero into the pit

Razer vs Gemini

In an attempt to free its twin from Razer's grip, one half of Gemini flipped both robots simultaneously

Minibots vs Androne 4000

Nuts 2's minibots attempt to disrupt Androne 4000's movements

Crackers 'n' Smash vs Apollo

Crackers wedges itself underneath Apollo

  • Through comprising of two or more robots, clusterbots are more difficult for opponents to defeat quickly, since they require one or all parts to become immobilised before they can be eliminated.
  • A clusterbot can allow for an effective attack synergy between individual segments; it was not uncommon for all parts of a clusterbot to block and surround opponents when fighting simultaneously, overwhelming or otherwise preventing them from attacking effectively. This tactic was demonstrated by Gemini, √3, Crackers 'n' Smash and The Swarm during their respective appearances.
    • An alternate tactic can allow clusterbots to separate and attack two or more opponents at once in Group Battles; both Crackers 'n' Smash and The Swarm demonstrated this in their respective series debuts.
  • Additionally, if one part of a clusterbot is attacking an opponent, the others can be used to activate arena hazards very quickly. √3 notably demonstrated this tactic in its Dutch Series 2 battle against ODT-Zero, with Elevation pressing the pit and Floor Spinner buttons immediately while the other two thirds attacked ODT-Zero.
    • In some cases, individual clusterbot segments can use certain arena hazards to help other segments in battle. A notable example occurred during The Swarm's Series 10 fight against Sabretooth, where the invertible Skye pushed the inverted Rubber Duck onto the Floor Flipper, re-righting the latter in the process.
  • If one part of a clusterbot is attacked, the other parts can assist it by targeting opponents which initiated the attack. This is best demonstrated in Gemini's All-Stars battle against Razer in Extreme 1, where one half of Gemini lifted and flipped Razer over in a successful attempt to free its twin from the latter's grasp.
  • Depending on their design, smaller-sized clusterbots - especially minibots - can prove highly effective in disrupting an opponent's movements, as their size can enable them to block or even get underneath them. Nuts' wedge-shaped minibots, for example, succeeded in getting themselves underneath Terrorhurtz, Androne 4000 and Concussion on various occasions, preventing the aforementioned opponents from driving properly and attacking the main robot. Meanwhile, Crackers got underneath and affected the movements of Carbide, Apollo and even Sir Killalot at various moments in Series 9-10.
  • For clusterbots consisting of more than four parts, it is possible to exchange different segments to suit different opponents and tactics, adding to their versatility. The Swarm was conceived as such that it could use four out of its five segments at once; for its battle against Sabretooth, the team were able to exchange Pinza for one version of Skye featuring anti-spinner defences.

DisadvantagesEdit

Big Nipper vs Smash

Smash (top-left) is flung out of the arena by Big Nipper

Scrambled

The remains of Scramble, Psycho Chicken's minibot, after being destroyed by Propeller-Head

  • In order to keep within the given weight limits, each segment of a typical clusterbot was required to be significantly smaller and lighter than normal competitors in their respective weight classes. As a result, they were usually more susceptible to getting pushed around, flipped, or seriously damaged by opponents, as the various defeats of Gemini, Black and Blue, √3, Crackers 'n' Smash and The Swarm demonstrated.
    • Minibots were especially susceptible to these issues due to their significantly smaller size and usually lower build quality. Nuts' minibots in particular were both thrown by Behemoth and damaged by Carbide at various points during Series 8, while Scramble (Psycho Chicken) was so severely damaged by Propeller-Head in US Season 2 that it entered its next battle without any form of mobility.
  • Due to them comprising of two or more robots, clusterbots require significantly more time and effort to maintain in between battles than regular competitors, since the team has to repair all parts of the robot at once within the allotted timeframe. Additionally, they require at least two or more drivers, adding to the complexity of operating them in the arena.
"If both robots take a lot of damage, we don't have just one robot to repair, but two, which could potentially be twice the work."
— Alex Botwright

List of Clusterbots/MinibotsEdit

Black&Blue

Black and Blue

Crackers-and-smash 10

Crackers 'n' Smash in Series 10

Geminitogether

Gemini, the pioneer of clusterbots

Meggamouse

Meggamouse and Charles

Terror Turtle 2016

Terror Turtle and The Hatchling, the latter being an example of a minibot

The-swarm

Four parts of The Swarm

Typhoon Twins

Typhoon Twins, two Lightweight robots joined together

V3

√3, a Dutch three-part clusterbot

Robots are listed alphabetically. Clusterbots which are not heavyweight entries are listed with a green background. Minibots are listed with a blue background.

Robot Series Appearances Notes
Black and Blue Series 7 A clusterbot built by Team Mousetrap. Both halves were equipped with 20kg, 6,000rpm spinning drums.
Coyote Series 10 Features a weaponless minibot named Roadrunner in Series 10 only.
Crackers 'n' Smash Series 9-10 Two similarly-sized box-shaped robots with completely different weapons. Crackers weighs 50kg and is equipped with interchangeable lifters (originally a front-hinged lifting arm), while Smash weighs 60kg and features a drum-like vertical spinner.
Expulsion Series 10 Features a two-wheeled minibot, Detention, which competes alongside the Series 10 version of the main robot.
Gemini Series 4-5, Extreme 1 The first UK series clusterbot, and the most successful heavyweight clusterbot. Only clusterbot to throw an opponent out of the arena. Won Best Design and Most Original Entry awards in Series 4, as well as the Series 4 Pinball Warrior Tournament. Each half equipped with a pneumatic flipping arm.
Legion Extreme 1 Only Antweight clusterbot. Each half equipped with a flipping arm.
Meggamouse Series 9 Included the main Meggamouse robot with a minibot Charles, shaped like a wedge of cheese.
Nuts Series 8-10 First clusterbot in the UK series to be made up of more than two robots. Comprised of one heavyweight robot (Nuts) plus two small wedge-shaped minibots. Returned for Series 9 with three redesigned minibots. In Series 10, one of the three minibots featured a 6hp drive system; only two of the three minibots were able to be used in the latter series due to Team Nuts consisting of three members.
Psycho Chicken US Season 2 The first competitor in any series to use a minibot, competing alongside an egg-shaped robot called Scramble.
Terror Turtle Series 8 Comprised of a lighter version of Terror Turtle, plus a 21.5kg minibot called The Hatchling.
The Kegs Series 10 A pair of two similarly-designed middleweight robots made out of two halves of a beer keg. Each half is invertible and armed with a horizontal bar spinner.
The Swarm Series 10 Five parts, each with unique weapons - Rubber Duck (flipper), Blenda (invertible bar spinner), Pinza (horizontal pincers), Skye ('windmill' with tyre sections and Sit-and-spin capabilities) and an invertible fifth robot also named Skye with a ramming wedge and optional static scoop. Four of the five parts can be paired together at once, with the robots used depending on which opponents The Swarm faces.
Typhoon Twins Extreme 2 Comprising Lightweight champion Typhoon Thunder and identical robot Typhoon Lightning, both with full-body spinners.
√3 Dutch Series 2 First three-part clusterbot to appear in any series and first clusterbot to feature non-identical designs for each robot. The wedge-shaped S.O.Xbot and box-shaped Elevation both featured flipping arms, while ODT-0.33 featured a simple wedge.

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