2NT Stopper-Ask

After a Weak 2-Bid, responder can query opener with 2NT for aces or kings in lower-ranking suits.

             S: AJ9xxx
             H: xx
             D: xxx
             C: Ax

             S: K
             H: AQx
             D: AKQxxx
             C: xxx

W        N       E        S

         2S      P        2N 
P        3C      P        3N
P/O

Notes: 3C = club ace or king