Basketball rule fundamental #19 -> the backboard [except thrower's backboard] is treated the same as the floor inbunds.
Case 9.5 situation [substituting word *floor* for *backboard* (per fundamental #19)] Player ends dribble. Throwing the ball against *floor* or an official constitutes another dribble, provided thrower is first to touch the ball after it strikes the official or the *floor*.
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