Answered: <G11> It seems too overpowering.

This rule seems to make it impossible for a team to make any attempt at preventing another teams robot from going somewhere.

If any part of your robot extends horizontally out of it’s original sizing cube (18 X 18 X 18 HS. or 24X24X24 & 15X15X15 College) then your robot will and are at risk of breaking G11.
Even if the element that is expanding is an intake or an arm or a scoop. If this robot tries to prevent another robot from, say for example, getting back to it’s starting tile then it will no longer be protected by G11.
This robot will have filled the two criteria: horizontal expansion and an effort to obstruct the field.

Blocking has been something that has been a part of VEX competition for as long as I have been competing with VEX. It is the reason that teams choose to make their robots have extremely strong gear ratios or invent new ways of shifting from high torque to high speed (gearshifts).

With this ruling you are forced to yield to any robot that is trying to get anywhere on the field or risk loosing G11 protection. If you don’t you can be considered blocking.

I can see this turning into VEX battlebots. There has to be some sort of limit on how much dammage one robot can impart on another. If you don’t you shouldn’t be surprised if at Worlds 2013 you see robots with saws or large smashing implements on the front of their robots for getting though anything that stands in their way. I am not looking to be nit-picky but I am concerned about what could eventually result from allowing such interactions to take place.

What parts, if any, are in no way allowed to be damaged by another team?
Cortex? Batteries? Motors? Pistons? Power Expander? Wires?

Where is the line drawn?
(Assume all intentions are to get past the obstruction.)

Lets start off with the most important rule in the manual.

If anyone actually think it’s legal to use saws and large smashing devices in the VEX Robotics Competition, they need to sit down and reevaluate things. In addition, there’s an actual rule against this.

If a robot has expanded in an effort to obstruct the field, you are no longer protected by <G11> while teams try and get past your obstruction. What this means is that you should expect and be prepared for vigourous interaction from the team trying to get past you. If your robot gets damaged while they are trying to get past you, they are not responsible. However, if their sole purpose is just to damage your robot, they would obviously penalized. As quoted above, intentionally ripping out wires is an example of something that would always be penalized.