An interesting thread on the VEX forum, so I'll post it here: The scenario is ... if the red robot stacks cubes in the smaller/unprotected goal zone, backs away, then the blue robot pushes them back into the stack while playing defense either causing them to touch the bottom cube or knocking cubes off the stack. What is the ruling?
According to the rules, SG3B and SG3F may come into play, but also may not.
- SG3F states that "Robots may not intentionally or accidentally, directly or indirectly, cause Scored Cubes within the opponent's Protected Zone to no longer meet the definition of Scored". Since it is specific that this takes place in the opponent's Protected Zone, this would not apply since the Protected Zone is defined as "the area of the playing field made up of the Outer Protected Zone and the Inner Protected Zone, in which opponent Robot interaction is limited"
- SG3B states that "Robots may not intentionally or accidentally, directly or indirectly, contact any Scored Cubes in either of opposing Alliance's Goal Zones". It could certainly be argued that, although the blue robot is indirectly touching a cube by pushing the red robot into it, the cube is no longer a Scored Cube once the red robot touches it - so, technically, the blue robot never indirectly touches a Scored Cube.
There are no other rules that I can think would be at play, except maybe the common sense rule G3. I think (and hope) the intent would be that the blue robot couldn't push the red robot into the stack and descore those cubes. I think (and hope) the intent of SG3F should say "within the opponent's Goal Zone" and not "within the opponent's Protected Zone".
I have seen www.robotevents.com/VRC/2019-2020/QA/376. Although the question specified that it was in the unprotected zone, the answer did not and could certainly be taken as referring to the goal zone in the protected zone.