Gerber

Gerber asks for aces when the partnership has agreed on a notrump contract. Gerber is used when partner's preceding bid was some level of NT. Responses

 4D =0 or 4 aces
 4D = 1 ace
 4H = 2 aces
 4S = 3 aces.

The 4C bidder may then bid 5C goes on to ask for kings. Responses are
5D =0 or 4 kings
5D = 1 kings
5H = 2 kings
5S = 3 kings.

             S: AKQJx
             H: AKxx
             D: Qxx
             C: x

             S: xx
             H: QJ
             D: Kxxx
             C: AKQJx

W        N       E        S

                          1C
P        1S      P        1N
P        2D      P        2S
P        3H      P        3N
P        4C      P        4H
P        6N      P        P/O


source  bbuff@user.rose.com