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Several versions of Blackwood are available: Standard Blackwood, Roman Blackwood and Roman Key Card Blackwood (RKC or RKCB). All versions are initiated by a bid of four notrump (), and the entire family of conventions may be called Blackwood 4NT in both versions, or Key Card 4NT in the key card variation.
So, according to partnership agreements, it is plain Blackwood showing two aces or RKCB showing two keycards without the queen of trumps. Byzantine Blackwood is not used in the first round of bidding, i.e., 1 ♥ - 4NT, as responder may only be interested in aces. Partnership agreement is required on whether the 4NT call is Blackwood or RKCB.
[2] [3] It is similar to Blackwood but uses 4 ♣ instead of 4NT as a relay (asking) bid to inquire about the number of aces held by partner. A further relay bid may follow to inquire about the number of kings held. Gerber is used primarily after notrump openings, responses, and rebids, making it a complement to Blackwood rather than a replacement.
An ace-asking or keycard-asking convention initiated by the first step above four of the apparent trump suit rather than uniformly by 4NT. Thus Kickback saves space when the trump suit is not spades. See Useful Space Principle and Blackwood: Asking bids other than 4NT. Kiss of death At pairs, plus or minus 200.
If responder has 11 or 12 HCP, then a small slam is a possibility but more information is needed about opener's hand before it should be bid. This is where a quantitative bid should be made. A bid of 4NT "invites" opener to: bid 6NT with a maximum holding of 22 HCP (11 + 22 = 33 which is sufficient) pass with a minimum 20 HCP (11+ 20 = only 31)
Under this convention, 4NT is still Blackwood or RKC when it is a jumping bid and not a natural raise. Also, if a player opens, raises, or jumps to 4H/4S without any preceding cuebids, 4NT by his partner is Blackwood or RKC. Likewise, in competitive situations where opponents have bid at the 3- or 4-level, 4NT is Blackwood or RKC.
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The Grand Slam Force is a bidding convention in contract bridge that was developed by Ely Culbertson in 1936. [1] It is intended to be used in cases where the combined hands of a partnership are so strong that a slam (winning at least 12 tricks) is a near-certainty and a grand slam (winning all 13 tricks) is a possibility.