Does Rule 1-2-2 help you: "If, on an unofficial court, there is less than 3 feet of unobstructed space outside any sideline or end line, a narrow broken line shall be marked on the court parallel with and 3 feet inside that boundary. This restraining line becomes the boundary line during a throw-in on that side or end, as in 7-6. It continues to be the boundary until the ball crosses the line."
Also 7-6-4: ART. 4
The opponent(s) of the thrower shall not have any part of his/her person through the inbounds side of the throw-in boundary plane until the ball has been released on a throw-in pass. See 9-2-10 Penalty.
NOTE: The thrower shall have a minimum of 3 feet horizontally as in 1-2-2. If the court is not marked accordingly, an imaginary restraining line shall be imposed by the *administering *official.
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