Official Q&A: VRC 2018-2019: Turning Point
51: Consequence for alliance on opposite alliance's platform
In the game manual definitions it states:
Alliance Platforms are denoted by their red or blue structural PVC pieces, and can only be used for Parking by Robots of the same color Alliance as the Platform.
So what is a referee to do if a robot from the opposing alliance gets on the parking platform, for example RED1 goes onto BLUE Alliance Platform with the intent of preventing either BLUE1 or BLUE2 from parking. Based on the definition this appears to be prohibited - so what would be the consequence?
There are no rules prohibiting a Robot from getting on to the opposing Alliance Platform. The usage of the word "Parking" in the Alliance Platform definition refers to the defined term "Alliance Parked"; that is, a Robot which sits on the opponent's Alliance Platform is not Parked, and no points are awarded to either Alliance.