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Roman Key Card Blackwood is predicated on existence of a trump suit, which determines which of the four kings and queens responder should show as key cards. Trump agreement is not necessary, however. One common rule is that the last suit bid before 4NT bid is the key suit, lacking trump agreement.
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.
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.
[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.
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This is similar to Blackwood but the ace-asking bid is 4 ♣ rather than 4NT. The responses are 4 ♦ for 0 or 4, 4 ♥ for 1, 4 ♠ for 2, and 4NT for 3. Similarly, a 5 ♣ bid following an ace-ask asks for kings. Gerber is a jump bid to 4 ♣ used after a notrump opening bid and on other occasions by partnership agreement.
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