The lid lifts, the check fires
In a discovered check (抽将) the moving piece captures or attacks while the piece behind it uncovers a check. The victim must answer the check first — by which time the material is gone. Your battery is already set: the chariot waits behind the horse on the e-file. Find the jump that grabs material AND opens the chariot's line — check and capture in one move, the cleanest tempo there is.