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5 ♣ to indicate 0 or 4 aces; 5 ♦ to indicate 1 ace; 5 ♥ to indicate 2 aces; 5 ♠ to indicate 3 aces; When responding, do not count a void as an ace. Generally, 4NT is ace-asking when your side has bid a suit. There are exceptions: when notrump has previously been bid by partner and he subsequently removes one's four-level suit bid to 4NT
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 mnemonic for a variant response structure to the Roman Key Card Blackwood convention. It represents "1 or 4" and "3 or 0", meaning that the lowest step response (5 ♣) to the 4NT key card asking bid shows responder has one or four keycards and the next step (5 ♦) shows three or zero. 1RF One round force. 2-under preempts
A king or doubleton king-queen not already shown in response to four notrump counts as one feature; a guarded king-queen combination not already shown count as two features. The responses are: 6 ♣ shows 0 or 3 features; 6 ♦ shows 1 or 4 features; 6 ♥ shows 2 features
0 to 5 HCP: a hand in this range normally should not be bid (i.e. should pass) unless partner opens with the strong 2 ♣ convention. 6 to 9 HCP: this is a minimum response hand. Responder can show support for partner's bid with a simple raise to the 2-level, bid a new suit but only at the one-level, or respond 1NT.
4 ♦ = 0 or 4 aces; 4 ♥ = 1 ace; 4 ♠ = 2 aces; 4NT = 3 aces; However, some experts [7] favour the following responses, analogous to Roman Blackwood: 4 ♦ = 0 or 3 aces; 4 ♥ = 1 or 4 aces; 4 ♠ = 2 aces; Other response structures have been devised along similar lines and partnership agreement is required to establish a preferred scheme.
six spades, not forcing 3NT: to play 4 ♣: splinter (singleton or void in clubs) in support of hearts 4 ♦: splinter (singleton or void in diamonds) in support of hearts 1 ♠: 2NT: Dbl: looking to penalize, no primary major fit 3 ♣: sound values in hearts at the three level or better 3 ♦: good raise in spades (8 losers or better) 3 ♥ ...