While it's not an illegal move per se, it is rather frowned upon in professional sumo and seen as a cheap move that exploits the fighters' implicit agreement on the initial clash.
Right now a bit part of Robo Sumo is educational outreach for STEM programs. Think of it as FIRST, but with more violence. There are handy guides available for those looking to build their own sumo robot you can even purchase kits from sites like Digi-Key.
Meanwhile here's a full video of highlights to check out:
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Chris Wiltz is the Managing Editor of Design News.
[Images source: YouTube / Robert McGregor]