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The 2NT response is forcing to at least game in opener's major suit. If the partnership also plays splinter bids, the Jacoby 2NT response tends to deny the shape for a splinter (i.e., no singleton or void). However, it might be the best alternative as prelude to possible slam exploration with unbalanced support in a holding stronger than the ...
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 ♥: six hearts, not forcing 3 ♠
In some positions if a simple bid of the suit would be forcing then a single jump can be a splinter. For example, in a system where 1 ♥ –2 ♣; 2 ♦ is a forcing sequence, 1 ♥ –2 ♣; 3 ♦ may be used as a splinter. (However, this approach would require a specific agreement in advance—many players use this sequence to denote a ...
The right-hand opponent may ask the alerter about the meaning of the convention, or may proceed as usual. If the right-hand opponent does not ask about the convention, their partner may do so when it is their turn. Under ACBL and EBU rules, some conventions are also announced, for example Jacoby transfers. When a player makes a transfer bid ...
For example, on the sequence 1 ♣-1 ♠ (with or without opponent's interfering);1NT-2 ♣;2 ♦,2 ♥ will show an invitational hand with minimum five spades and four hearts, 2 ♠ an invitational hand with minimum five spades (in which case one does not have four hearts) or possibly six spades with or without four hearts. 2NT will show a balanced invitational hand, 3 ♣ typically an ...
2NT shows 3 controls (specifically 3 kings), and; 3 ♣ shows 4 controls, 3 ♦ or higher, etc. on up the line. With ace-showing responses, the responder bids the suit of the Ace, 2NT with two or more kings, and 2 ♦ with a king or less. With (unlikely) 2 aces, the responder bids 3 ♥.
The Jacoby 2NT is used to show a game-forcing raise of a major suit with four-card support. Negative doubles are used through the level of 2 ♠. Fourth suit forcing is used. Michaels cuebid and Unusual notrump are used. Conventions are specified as being "off" in response to a 1NT overcall, except that 2 ♣ is still Stayman.
Unusual vs. unusual [1] is a competitive bidding convention used in contract bridge by the opening side after an opponent has made an overcall showing two suits (e.g. a Michaels cuebid or an Unusual notrump overcall).