A double by advancer, after overcall has bid, and after responder has raised opener's suit, is responsive, and shows the unbid suits. It is used ONLY after opponents have found a suit fit. Otherwise, the second double is for penalty.
S: KQJx H: AJTx D: x C: K9xx S: Axxx H: Qxxx D: xx C: JTx W N E S 1C X 2C X 3C 4H P/O