CAB: The Control Asking Bid
Both Precision players and other Forcing Club system players use a Control Asking Bid. In terms of controls, an ace is equal to two controls and a king is one. This bid is one of three asking bids that we use.
Below is a description of CAB... If responder shows 8+ points and a 5+card suit in response to our strong club, then a rebid of 1NT over partner major suit response is a Control Asking Bid. If responder has a positive response with a minor, and bids it at the 2-level, then the Control Asking Bid is 2NT.
Opener's rebid of 1NT asks, "How many controls do you have, partner?"
The 2 response is the third step, indicating three controls - either an ace and a king, or three kings. Often the partner who asked can figure out which holding it is. For example, if the opener is holding two kings, then responder cannot have three kings.
NOTE: There are only 12 controls total in the deck.