Simplified and Expanded by Wayne Flournoy
and Anna Marsh (OKbridge user-name: "ana")
Originally developed as ACBL Standard Yellow Card

The source page is http:www.annam.co.uk/sayc.htm
(Rewritten)

Slam Bidding
 

Blackwood Convention
    Blackwood 4NT is used to ask for Aces. Responses to 4NT show the number of Aces by steps. A 5NT bid that follows Blackwood 4NT asks for Kings.
    Note: If the Blackwood bidder wishes to sign off in 5NT, he should bid an "unplayable" suit at the 5 level (ie. an unbid suit or opp's suit) and the responder is obliged to bid 5NT eg. [1H-2D] [3D -4NT][5C-5S(unbid suit)][5NT-p]. {See also Part 2 Roman Key Card Blackwood};
[...][4NT     Blackwood;
(-)/?           5C:0/4;
                 5D/M:1/2/3;
(-)]
[5NT-?]      similar steps as above;


Quantitative 4NT
    A direct raise after 1NT/2NT to 4NT is Quantitative and invites 6NT if opener is maximum or pass if minimum. Also applies over partner's direct overcall of 1NT if no interference from RHO. (Over an opener of 3NT, 4NT is Blackwood).
[1NT or 2NT strong;
(-)/4NT        Quantitive;
(-)]
[?       6NT:max;
          pass:min;

DOPI *
    "Double with 0 Aces, Pass with 1". Allows response to Blackwood over opponent's interference. Note: ROPI = Redouble with 0, pass with 1;
[...][4NT        Blackwood;
(X or 5Y)/?

          X or XX:0;
          pass:1;
          next 1step:2;
          next 2step:3;
          next 3step:4;



Control-Showing Cuebids
    A control-showing bid may be used to find 1st and 2nd round controls once the trump suit has been agreed. The control- showing bid is a non-jump bid at or above the 3-level (if agreed trump suit is a major) or the 4-level (if trump suit is a minor) in an unbid suit.
Rules for control-showing bids:
1. With two controls, it is usually better to first bid the one that keeps the bidding lower. In some cases it is better to reverse the order, i.e., [...][4C-4H][4S-?] rather than [...][3S-4H][5C-?].
2. Bid suits first that have not been bid by your partnership. Bid Aces 1st, Voids 2nd, Kings 3rd.
    An exception is to bid a 2nd round control in an unbid suit before-cueing 1st round control in a suit that has been shown or denied. Avoid bidding a singleton or void in a suit bid naturally by
your partner.
3. Return to the agreed trump suit below game to discourage a slam try. If partner bids above game you must return the bid if possible.
4. If a control-showing bid is doubled, redouble shows 2nd round control of that suit. A pass encourages partner (versus a return to agreed trump suit to discourage).
5. Control-showing bids above five of the trump suit are a try for seven.
6. If either partner is able to judge the correct final contract he should bid it as soon as possible.
7. The partnership is committed to playing in the agreed trump suit once a control-showing bid is made.

Gerber *
    Gerber is used to ask for Aces and Kings over an opening 1NT or 2NT bid by partner or a rebid of 1NT or 2NT by partner. 4C asks for Aces and 5C for Kings. (Over an opening bid of 3NT, 4C is Stayman).
    Note: If the Gerber initiator makes any call other than 5C, it is to play (including 4NT);
[1NT or 2NT-4C] Gerber;
[?       4D:0 or 4;
          4H:1;
          4S:2;
          4NT:3;
(-)/?    5C:Gerber further;The keys are similar number to above;
          pass:to play;
          other than 5C:to play;


Grand Slam Force (GSF) (also known as Josephine) *
    A bid of 5NT without the preceding 4NT Blackwood bid is a GSF and asks partner to bid 7 of the agreed trump suit if he has 2 of the 3 top trump honours (ie.A,K,Q):
*Bid 6 if you have less than 2;
*Bid 7 if you have 2;
{See also Part 2 Voluntary Bid of 5 of a Major}
from "http://cf71632485.spaces.live.com/blog/cns!332B9AE1E4050FC8!388.entry"