BridgeHands

Choice of Game Cuebid - A cuebid by opener over opponent's intervening preemptive bid requests partner to choice game between either bid suit.  If responder chooses one suit and opener then bids the other suit, opener is showing interest in slam.  Example:

1H - (3D) - 3S - (P);
4D                                   4D requests partner to choose between the majors

(2D) - 3D                       3D requests partner to choose between the majors

1S - 2S; 3N                    3N offers partner to play in 3N or 4S (in some systems)

Also see Lebensohl