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Jacoby 2 Notrump (Jacoby 2NT, Jacoby Two Notrump)

After a major suit one level opening bid by partner, the conventional response of 2 Notrump shows 4+ card trump support with an opening hand and interest in slam. After responder's 2 Notrump call, opener's rebids to Jacoby 2 Notrump are typically "slow-shows - fast denies" (strength)

Response

Meaning after Jacoby 2 Notrump (Jacoby Two Notrump)

4  of Same Major

Minimum hand

4 of New Suit

A good 5 card side suits. Note: some play this as a void

3 Notrump

14+ points and 5 in Major

3 of Same Major

14+ points and 6+ in Major

3 of New Suit

Splinter, indicating a singleton or void in the bid suit (most partners agree responder should have good trump honors or other extra values)

 Notes:

1.

Some partners play different ranges after Jacoby 2 Notrump, such as:
 

4 of Same Suit

Game signoff with 12-14 points and strength in bid suit

3 Notrump

14-16 points with a balanced hand

3 of Same Major

17+ points in bid suit

2.

Some partnerships consider 3 trump sufficient when holding 2 strong honors

3.

A minority play opener's 4 level new suit bid shows a void

 

When opponent (advancer) interferes after responder bids Jacoby 2 Notrump:

Method 1: Basic

Response

Meaning

4  of Same Major

1H - (P) - 2N - (3D);
4H


4H is signoff, no shortness

Pass

1H - (P) - 2N - (3D);
P

Pass shows shortness in opponent's bid suit

New Suit

1H - (P) - 2N - (3D);
3S

Shortness in bid suit

3 Notrump

1H - (P) - 2N - (3D);
3N

Medium or maximum hand, no shortness

Method 2: Advanced (Mike Lawrence treatment), advancer interferes after Jacoby 2 Notrump

Response

Meaning

4  of Same Major

1H - (P) - 2N - (3D);
4H


4H is signoff

Pass

1H - (P) - 2N - (3D);
P

Pass is "waiting", with no controls and a good hand, or control with a poor hand, or strength and length in opponent's bid suit (hoping for Double)

Double

1H - (P) - 2N - (3D);
X

Double shows control (Ace or King) in opponent bid suit

3 of Same Major

1H - (P) - 2N - (3D);
3H

6+ trump and a control in opponent's bid suit

3 Notrump

1H - (P) - 2N - (3D);
3N

Singleton in opponent's bid suit (or void if opponent bid 3S)

4 Minor

1H - (P) - 2N - (3D);
4C

Singleton in minor and a control in opponent's bid suit

Cuebid 4 in opponents' bid suit

1H - (P) - 2N - (3D);
4D

Void in opponent's bid suit (or 3 Notrump if opponent bid 3S)

When advancer interferes after responder bids Jacoby 2 Notrump and opener has passed the bidding, showing various hand shapes (see above):

Response

Meaning

Double

1H - (P) - 2N - (3D);
P   - (P) - X


Double for Penalty

3 in new Major

1H - (P) - 2N - (3D);
P   - (P) - 3S

Ace in suit and 0-1 loser in opponent's bid suit

3 Notrump

1H - (P) - 2N - (3D);
P   - (P) - 3N

King of opponent's bid suit

4 in Minor

1H - (P) - 2N - (3D);
P   - (P) - 4C

Ace in suit and 0-1 losers in opponent's bid suit

Also see books on Slam and other slam conventions: 1430, Baby Blackwood, Blackwood, Controls, Exclusion Blackwood/Voidwood, Gerber, Grand Slam Force, Jacoby 2 Notrump, Key Card Blackwood, Kickback, Last Train,  NAMYATS, Pick a Slam, Quantitative Notrump Bid, Rolling Blackwood, Serious 3 Notrump, Slam Try - Stayman, Splinters, Opener Jump Shift, Strong Jump Shift, and legacy treatments as Roman Asking Bids, Roman BlackwoodRoman Gerber.  Slam treatments also include interference of an overcall by opponents, as Negative Slam Double, DOPI, DEPO, ROPI.

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