R106      ROBOTS can’t choke up on chain. ROBOTS may not have MECHANISMS (or a combination of MECHANSIMS) designed to reduce the working length of the STAGE chain.

G419      *Don’t tip or entangle. A ROBOT may not deliberately, as perceived by a REFEREE, attach to, tip, or entangle with an opponent ROBOT.

G415      Watch your ARENA interaction. With the exception of GAME PIECES, addressed by G410, a ROBOT may not damage an ARENA element. A ROBOT is prohibited from the following interactions with an ARENA element, except chain (see G416) and a GAME PIECE (see Section 7.4.2 GAME PIECES).

G413      Expansion limits. A ROBOT may not expand beyond either of the following limits: