[Kyle Heaton]

Originally Posted by MasterEric

Is having a ball implied or explicit?

And given sufficient prediction of the opponent's actions (and given that most teams can't autonomously sweve) can I place my robot such that it is an opponent robot's autonomous path, halting their driving and preventing them from scoring? Can I place my robot somewhere else then program it to move into the opponent's robot's autonomous path?

From 3.2
"A. pre-load one (1) BOULDER in or on their ROBOT such that the BOULDER is fully supported by their ROBOT..."

A spy can start with a ball, because this rule doesn't state(nor does any other rule) that a spy can't have a ball. Only special thing about spies is where they start the match.

Also, you can't play a robot in your zone, so it is impossible to block an opponents path without breaking G13.