SPECIAL DOUBLES

Negative:

    If you use Negative Doubles, check the box and write in after thru the level up to 4 through which you use them - show highest overcall that a double of which would be negative, i.e., "thru 3" implies a double of a 4 overcall would be penalty
    (or "cards" if you make note
    of that somewhere in the Special Doubles section).
    If you use them over bids
    of 4 or higher, check the
    "4+" box and note any higher level through which negative doubles are used.
    (Remember that negative doubles over bids of 4 or higher require an Alert.)

Responsive:

    Check and write in after thru as for negative doubles, if applicable.

Maximal:

    Double used artificially to show game interest in a bid-and-raised suit. Applies when opponents bid the maximal suit (the one just under three of agreed suit), i.e.
    1 - Dbl - 2 - 3 - Dbl is an artificial game try in spades. Check the Maximal if applicable.

Support Dbl:

    Double by opener at 2nd turn shows 3-card support for responder's major, i.e.,
    1 - Pass - 1 - 1 - Dbl shows 3-card support. Indicate if you use support doubles and the level thru which you use them.

Redbl:

    If you also use the support redouble indicate this by checking this box.

Card-showing:

    Checking this box means that you frequently make doubles that show values at low levels in situations where the unAlerted meaning of the double is penalty.

Min. Offshape T/O:

    Check this box if, by agreement, you make takeout doubles with minimum hands which do not show support for the unbid suits. For example,
    if your T/O of an opening 1 bid with
    KJx, xx, AQxx, Kxxx would not be unexpected to partner.

Other:

    On the blank line at the bottom of the Special Doubles section, write anything else about special doubles that doesn't fit elsewhere.

The above is the official ACBL convention card guidelines as of Sep 2000.