[GBIT]

Though I will not speak to the strict legality of it, as I haven't RTFM completely yet, I will say that both strategies, Pushing bots in to your defensive zone and capping them to render them useless, And not in the Spirit of FIRST and are most certainly not GP. I believe though on just my memory alone, which fails me from time to time, in Rack n' Roll any tube that was intentionally placed by an opposing team in order to prevent the robot to posses a tube was considered non-existant.