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Exclusion Blackwood or Voidwood. [7] was devised by Bobby Goldman [8] as an attempt to resolve the situation when the Blackwood-asker has a void. In that case, he is not interested in the partner's ace in the void suit, as he already has the first-round control; partner's ace would present a duplicated value in that case.
In response: A bid of five notrump shows either: Any two aces, or; One ace, and the kings of all suits previously bid by either partner. A bid of a new suit shows first-round control (ace or void) there, but is not compulsory with such a holding. Six of a previously bid suit shows a desire to play there (holding one ace, or the kings of all bid ...
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.
A bid that shows insufficient values for a stronger response. For example, a 2 ♦ response to a forcing 2 ♣ opening bid is often negative, as is a 1 ♦ response to a Precision 1 ♣. Negative slam double In a competitive auction, the double of a voluntarily bid slam to show no defensive tricks, and therefore to suggest a sacrifice. Neuberg ...
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.
Response: Meaning: 1 ♥: 2NT: Dbl: looking to penalize, no primary major fit 3 ♣: good raise in hearts (8 losers or better) 3 ♦: sound values in spades at the three level or better 3 ♥: weak raise in hearts but stretched (8½ to 9 losers) 3 ♠: six spades, not forcing 3NT: to play 4 ♣: splinter (singleton or void in clubs) in support ...
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.