Via Robots.net:

At the recent RSSC Mini Sumo competition, spectators watched as robots pushed each other around until the three winners were determined. We all know the classic Mini-Sumo rules. Two robots go into a 30 inch ring and try to push each other out. The last robot in the ring wins. What we found more interesting was the video of what happened afterwards when they decided to toss eleven robots into the Sumo ring at once. After lots of chaotic pushing and shoving, a single NXT tracked robot is left standing in the ring.