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CAB - Control Asking Bid (Epsilon), an acronym associated with "Big Club" (Precision) and similar systems.  The convention, typically used in a game forcing auction subsequent to a Trump Asking Bid (TAB) or Ace Asking Bid (AAB), queries partner for the primary honors in a given suit.   Example:

1C - 1S;
2S -  3C;
    2S is TAB, 3C is second step (Notrump is 1st), showing 1 top honor
3H -  ?       3H is CAB in Hearts, asking responder to identify Heart controls.

Control Asking Bid responses are (two methods are shown)
 

Step

Method 1
(fast shows)

Method 2
(slow shows)

1st

3+ low cards, no honors

First and second round of control, AK or AQ

2nd

Third round of control, Qxx or xx

First round of control, Axx or void

3rd

Second round of control, Kxx or x

Second round of control, Kxx or x

4th

First round of control, Axx or void

Third round of control, Qxx or xx

5th

First and second round of control, AK or AQ

3+ low cards, no honors

If asking partner rebids the suit as a further query, the responder makes a first or second step bid to shortage or honors values ("re-CAB), respectively.

"Compressed" Control Asking Bids occasionally are initiated at high levels, where using a 5 step response is inefficient.  When partner initiates a CAB at 5C or above, the following approach applies.

Compressed CABs:
 

Step

Method 1
(fast shows)

Method 2
(slow shows)

1st

No controls

First round of control, Axx or void

2nd

Second round of control, Kxx or x

Second round of control, Kxx or x

3rd

First round of control, Axx or void

No controls

Also see Precision systems, Alpha Cuebid , Beta Cuebid, Trump Asking Bid, Control Asking Bid, Suit Asking Bid, Delta Asking Bid and Precision/Big Club Books

Some Acol players play a CAB variation after opener's strong 2C bid.  Responses are:
 

2D

Less than 8 points and no Aces

2H

Holding the HA (possibly another Ace)

2S

Holding the SA, not the HA

2N

Holding 8+ points and no Aces

3C

Holding the CA, no major Aces (possibly the DA)

 

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