Robots fight to be the world champ

Beware of robot fighting! Two-legged robots fight against each others at Tokyo's 12th Robo-One Grand Championship match. Twenty-five finalist robots put up their fists to knock one another out of a ring on Saturday. To be the winner, contestants need to be able to keep their balance while punching and dodging blows, and get up when pushed down.

Further reading at Japan's robots slug it out to be world champ

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