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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.
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.
Norman four notrump is an alternative to the Blackwood convention family. Used when the contract level can be better determined by knowing the numbers of aces and kings that are "missing" in the partnership's two hands, the convention is initiated by a bid of 4NT to ask that partner provide information about his ace and king holdings.
This cheat sheet is the aftermath of hours upon hours of research on all of the teams in this year’s tournament field. I’ve listed each teams’ win and loss record, their against the spread totals, and
Playdom has created a second hidden object game called Blackwood & Bell Mysteries to follow the success of their hit Facebook game, Gardens of Time, which in turn, had inspired Zynga's Hidden ...
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.