Tokyo, Japan - The International Robot Sumo Tournament 2013, in the Ryougoku Sumo Hall (Ryogoku Kokugikan) on December 15, 2013. Robot-sumo wrestlers from seven different countries (Japan, Brazil, Mexico, Turkey, Latvia, Mongolia and Estonia) compete this year. The international tournament is a part of the All Japan Robot-Sumo Tournament which has been held since 1989. According to the rules the robot wrestler loses when the body touches the outside area of the sumo ring. (Video by Rodrigo Reyes Marin/NipponNews)

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