Move one piece per turn, by real chess rules. Your pieces block each other. There are no chess captures.
Then every ball takes one step. Balls bounce off walls and pass through everything else.
You catch a ball when it steps onto one of your pieces. So aim at the ringed square — where it is going, not where it is.
Landing on a ball does nothing. It dribbles out from under you.
Any piece is a basket, even one that didn't move. Park a piece and wait.
The Color Law: a bishop never leaves its color. A knight flips color every hop, and so does a rolling ball. Some chases are impossible — check the colors.