Jacoby 2NT: Difference between revisions
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The Jacoby 2NT bidder must assess how the hands fit, and may use [[cue bid]]s and/or [[slam conventions]] to find the best contract or bid four of the opening bidder's suit (or pass, if the opening bidder has already done so) if slam does not appear to be in the cards. |
The Jacoby 2NT bidder must assess how the hands fit, and may use [[cue bid]]s and/or [[slam conventions]] to find the best contract or bid four of the opening bidder's suit (or pass, if the opening bidder has already done so) if slam does not appear to be in the cards. |
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==References== |
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[[ACBL]] Article by Jim Jacoby: <ref> http://www.acbl.org/play/in-their-own-words.php?convention=jacoby&action=Go </ref> |
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[[ACBL]] Bidding Toolkit Article: <ref> http://web2.acbl.org/documentLibrary/play/Commonly_Used_Conventions/jacoby2NT.pdf </ref> |
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[[Category:Bridge conventions]] |
[[Category:Bridge conventions]] |
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{{bridge-game-stub}} |
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Revision as of 01:53, 20 February 2009
Jacoby 2NT is a bridge convention in which a bid of 2NT over partner's opening bid of 1♥ or 1♠ shows a hand with opening strength and at least four cards in the opening bidder's major suit. If the partnership also plays splinter bids, the Jacoby 2NT response also denies a singleton or void. The convention is named for its inventor, Oswald Jacoby. In any case, the Jacoby 2NT response is forcing to game in the opening bidder's major suit.
There are two common methods of continuing bidding over a Jacoby 2NT response, the choice of which is a matter of partnership agreement. These methods differ only in the definition of a bid of another suit. One method uses the following bids.
>> With a void in spades or a singleton in any suit, the opening bidder cue bids three of the short suit.
>> With a void in hearts, diamonds, or clubs, the opening bidder cue bids four of the void suit. (Note that the opening bidder must cue bid 3♠ rather than 4♠ with a void in that suit so a Jacoby 2NT responder who judges that slam is not in the cards can sign off at 4♥.)
The other method uses the following bids.
>> With another good five card suit, the opener bids four of the second suit.
>> With a singleton or void in the absence of another good five card suit, the opening bidder cue bids three of the short suit.
In either method, an opening bidder who cannot make the bids above must continue with one of the following bids.
>> With a forcing hand (usually 18-21 HCP since a hand with 22 HCP or more would have opened 2♣), the opening bidder rebids three of the opening suit. This bid strongly suggests that a slam is very probable.
>> With an invitational opening hand (usually 15-17 HCP), the opening bidder rebids 3NT. This bid suggests a possible slam if the Jacoby 2NT bidder has similar strength.
>> A bid of four of the opening suit shows a minimum opening hand (usually 14 HCP or fewer), and requires the Jacoby 2NT bidder to have a very strong hand (typically 18 HCP or more) to try for slam.
The Jacoby 2NT bidder must assess how the hands fit, and may use cue bids and/or slam conventions to find the best contract or bid four of the opening bidder's suit (or pass, if the opening bidder has already done so) if slam does not appear to be in the cards.
References
ACBL Article by Jim Jacoby: [1] ACBL Bidding Toolkit Article: [2]