# Tabletop battle simulation of two open-source Jumper robot crabs in MuJoCo

- Source: Reddit r/robotics
- Published: 2026-10-20T00:41:46.000Z
- RoboHot: https://robohot.news/en/items/vcqzzy8h433ijn9aci1cg7sli
- Original: https://www.reddit.com/r/robotics/comments/1xae40s/simulated_a_desk_fight_between_two_opensource/

## Summary

Zymbiotek created a tabletop battle simulation in MuJoCo of two open-source Jumper robot crabs for a KingKong Robotics competition. The motions are physics-simulated based on measured servo torque curves, and the dance is a reinforcement learning policy that can run on the real robot. The counter uppercut is a real simulated motion, with only the final flip being animation—testing showed one Jumper cannot flip another.