A1 holds the ball near the center of the court. A2 is on the right side of the basket and closely guarded by B1. A3 moves to a position behind B1, after which A2 circles B1 and receives a pass on the left side of the basket and scores.
Legal goal unless there was contact and responsibility for it is charged to A3. This will depend on whether A3 took a position at such distance as to permit B1 one step space for normal movement without making contact.