The "four points" idea that's been quote in this forum many times has helped me immensely:
Team A has control
Ball has front court status
Team A last to touch in frontcourt
Team A first to touch in backcourt
equals backcourt violation. Note that Team A does not have to have possession in the front court! For example, A1 in the backcourt passes towards A2, who is also in the backcourt. A3, who is in the frontcourt, reaches into the backcourt and grazes the ball as it goes by. As soon as A2 touches the ball, backcourt violation.
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