Jacoby 2NT is a game-forcing raise of partner’s 1M opening bid. It is used as a slam-exploration tool, and has the advantage of keeping the auction at a low level on game-forcing hands. It is alertable.
Requirements for a Jacoby 2NT Bid
A Jacoby 2NT bid must be made by responder at her first call after her partner has opened 1M. It does not apply if there is a bid or a double by the opponents after opener’s 1M bid. (See In Competition below.) Responder will have 12+ HCP (enough to force to game) and at least 4‑card support of opener’s major. There is no upper strength limit. Usually responder will have a relatively balanced hand. With an opening hand and only 3‑card support, responder cannot raise immediately (because the forcing raise promises 4‑card support). With 3‑card support, responder must make a two-step raise: she starts by making a game-forcing 2/1 bid (step 1) and then shows her support by raising opener’s major at her next call (step 2).
Examples (partner opens 1♠):
♠ QJ85 ♥ A92 ♦ KQ7 ♣ J75
A minimum 2NT raise.
♠ A8653 ♥ K3 ♦ A6 ♣ 9432
This might be only 11 HCP, but such good controls and 5‑card support call for a GF.
♠ AQ62 ♥ A86 ♦ AQJ7 ♣ A7
No upper limit on strength for Jacoby 2NT!
♠ KQ93 ♥ 75 ♦ AJ62 ♣ J62
Not strong enough to force to game – this is an invitational hand. Make a Limit Raise of 3♠.
♠ KQ7 ♥ Q5 ♦ KJ86 ♣ AQ96
With only 3‑card support, you cannot use Jacoby 2NT. You need to make a two-step raise: start with 2♣ to set a GF, then support spades at your next call.
Opener’s Responses
Opener has a prescribed set of rebids in response to a Jacoby 2NT raise. They are designed to help you investigate slam effectively. After 1M-2NT:
- Bidding a new suit at the 3‑level shows shortness (singleton or void). This is alertable.
- Bidding a new suit at the 4‑level shows a second 5‑card suit (usually a decent suit).
- Rebidding your suit at the 3‑level (3M) shows a balanced/semibalanced hand (i.e., no singletons or voids) with extra values (16+ HCP).
- Rebidding your suit at the 4‑level (4M) shows a balanced/semibalanced hand (i.e., no singletons or voids) with a dead minimum and poor slam potential. I like to limit this to a maximum of 1 keycard.
- Rebidding 3NT shows a balanced/semibalanced hand (i.e. no singletons or voids) that falls somewhere between 3M and 4M. (i.e., a minimum [12‑15 HCP] but with at least some positive slam value, and usually 2+ keycards.) This is alertable.
When opener is 5‑5, he will have a choice of responses (since with 10 cards in two suits you must have shortness in one of the other suits). Generally, it is best to show the side suit rather than the shortness. This tells partner a lot more about your hand. Only show the shortness if the side suit is very bad – only one (or none) of the top four honors. I prefer to require opener to have a control (ace or king) in his doubleton. That way responder knows whether she can safely ask for keycards. So lacking this control, opener must show shortness.
For hands without a singleton or void, opener has three bids: 3M, 3NT, 4M. These are in order of strength – remember, the stronger your hand, the lower you like to keep the bidding, so you have more room to explore a slam. By far the most common of these bids is 3NT. The 4M bid should be quite rare. Jacoby 2NT is a slam exploration tool whose purpose is to keep the bidding low so that you can look for slam without getting past 4M. A 4M rebid by opener defeats this purpose, and so should only be made with a flat minimum hand with no slam potential. (A 1 on my 1-5 slam evaluation scale.) When considering slam potential we are mostly talking about controls (good) vs. quacks (bad). That’s why I like to limit the 4M bid to 1 keycard. There’s nothing worse as responder than having a great hand, starting with Jacoby 2NT, and hearing opener jump to 4M. How bad is her hand? Should you push on, or just give up? When the 4M bid is very rare and narrowly defined, responder has no problem – she only continues on with a moose.
Examples:
You open 1♥ and partner makes a Jacoby 2NT raise.
♠ 8 ♥ AQ973 ♦ QJ73 ♣ QJ6
Bid 3♠ to show your shortness. Your hand is a minimum, but you always show shortness when you have it.
♠ A74 ♥ KQ743 ♦ KJ8 ♣ 72
A balanced minimum, but with good controls this is a 3NT bid (not even close to a 4M bid).
♠ 7 ♥ AQT63 ♦ A6 ♣ KJ953
A textbook 4♣ bid, showing your 5‑5 shape.
♠ K4 ♥ AKJ52 ♦ AQ93 ♣ 65
3♥, showing a strong hand (16+) with no shortness.
♠ Q5 ♥ AJ863 ♦ Q72 ♣ QJ3
This is what a 4♥ bid looks like! Balanced, minimum, poor controls, only 1 keycard.
♠ AK ♥ KQ842 ♦ J7543 ♣ 3
With such a poor diamond suit, this is the time to show club shortness instead (by bidding 3♣).
♠ AQJ7 ♥ AK985 ♦ 4 ♣ KQ3
Bid 3♦ to show your shortness. There is no upper limit here. Surely you will drive to slam with such a strong hand, but you still start by showing your shortness. If partner shows interest (i.e., she doesn’t have too many wasted values in diamonds) you could have a grand.
♠ Q5 ♥ AK652 ♦ KQ873 ♣ 3
Without a control in your doubleton, bid 3♣ to show shortness rather than showing the 5-card ♦ suit.
The Rest of the Auction
Nothing fancy happens after opener’s rebid. This is a control-bidding situation (you have set a major suit as trumps and are in a game-force), so responder assesses her interest in slam and bids accordingly. 4NT by either partner is Roman Keycard Blackwood (with opener’s major agreed as trumps).
When opener shows shortness, responder should evaluate slam chances based largely on her holding in opener’s short suit. She should get excited about holdings like Axxx or xxx because they contain no wasted values. Only slightly more than minimum game values (about 28 HCP) are needed to look for slam when there are no wasted values opposite shortness, so even with a minimum responder should be aggressive looking for slam with these holdings.
Conversely, holdings with considerable wasted values opposite partner’s shortness – like KJx, KQxx, QJxx – significantly diminish slam prospects. Not only are these cards “wasted” opposite partner’s shortness, but they are honors that could have been somewhere else, where they would have been helpful, filling in partner’s other suits. So the ♣ K opposite partner’s singleton club is not just unhelpful because it’s opposite shortness, but also because it’s not the ♦ K, which would have been incredibly valuable opposite partner’s ♦ AQxx. Wasted values in partner’s short suit means the hands do not fit together very well, and when hands do not fit together extra values are required for a slam.
Responder conveys interest in slam by control-bidding. To show a lack of slam interest (generally based on wasted values opposite opener’s short suit), she jumps to 4M. Even with a minimum, if you have a good holding (i.e., minimal wasted cards) opposite opener’s shortness, you must communicate this by making at least one control-bid. Just knowing that your values aren’t in his short suit might be enough for opener to drive to slam (if he has some extra values). Remember, when the hands fit well together (minimal wasted values), slam can often be made on much less than the normal 33 HCP; when the hands fit poorly (wasted values), slam usually requires more strength than normal.
When opener shows a second 5‑card suit, responder needs to upgrade any honors she has in that suit. Queens and jacks nearly double in value when they are in partner’s suits. At the same time, responder knows that opener has only 3 cards in the other two suits, so she should treat them both like short suits and devalue slow (i.e., non-ace) values there. Quacks are especially poor cards in these suits. Kings are harder to evaluate, since they could be useful if opposite partner’s doubleton. Aces are always valuable. This concept is known as In and Out Valuation. Honors (particularly secondary honors like queens and jacks) are very valuable in partner’s suits, but of very little value outside of them. Aces (and to a lesser extent kings) retain their value outside of partner’s suits, though honors in partner’s suits are always more valuable than ones outside.
To show a good hand (i.e., one that fits well with partner’s) responder control-bids; with a poorly fitting hand she returns to 4M. There will be limited room (and sometimes no room) to explore slam below 4M when opener jumps to show a second suit. When the hands fit together well, responder needs to be willing to go past 4M, even with a minimum. Remember that opener promises controls in both of the other suits, so you can feel confident asking for keycards if the fit is good.
When opener shows a balanced hand, the partnership will likely need the full 33 HCP for a slam; light slams only occur when one or both partners have some shape. If opener shows a minimum (by bidding 3NT or 4M), responder should give up on slam unless she has significant extra values. When opener bids 3M she is unlimited, so responder should cooperate by control-bidding unless she has a dead minimum with poor controls. Signing off in 4M by either partner always shows a minimum with poor slam prospects.
Examples:
The auction begins 1♠-2NT; 3♦ (diamond shortness)
♠ KQ76 ♥ AJT4 ♦ 643 ♣ K2
You have a minimum, but with great controls and, most importantly, no wasted values in diamonds, you should be very optimistic about slam chances. (A minimum from partner like ♠ Axxxx ♥ KQx ♦ x ♣ Axxx makes 6♠ basically cold.) Communicate this via a 3♥ control-bid.
♠ AQ43 ♥ Q9 ♦ KQ54 ♣ 873
Your hand just got a lot worse! You had a minimum to begin with, and now big chunk of your values are wasted opposite partner’s singleton diamond. Jump to 4♠ to let partner know that you don’t have the hand she’s looking for.
♠ AJ83 ♥ AKT4 ♦ KQ2 ♣ K3
You have wasted values in diamonds. But your hand is so strong that you still have good slam prospects. Think about it this way: imagine your diamonds were xxx instead of KQx. Would you still have bid 2NT? Absolutely! You’d still have 15 HCP. And if you had that hand and heard partner show diamond shortness, you’d be pretty excited. So you should be at least as excited with this hand. Control-bid 3♥.
The auction begins 1♠-2NT; 4♣ (5 clubs)
♠ AJ54 ♥ KQ6 ♦ QJ7 ♣ 843
Your hand is awful considering the auction: a minimum, no fitting honors in clubs, and lots of quacks in partner’s short suits. Show your lack of enthusiasm by bidding 4♠.
♠ AJ93 ♥ A54 ♦ A83 ♣ Q5
Not much more than a minimum, but this hand is excellent: aces in the side suits and quacks in partner’s suits. A normal minimum from partner like ♠ KQxxx ♥ xx ♦ x ♣ AKxxx makes for a great slam. Control-bid 4♦, and plan to follow up with RKB if partner doesn’t.
♠ AQ64 ♥ KQ5 ♦ AKJ2 ♣ 87
Not a great fit, but with so many extra values slam still has to be in the picture. Control-bid 4♦.
The auction begins 1♥-2NT; 3NT (decent minimum)
♠ A5 ♥ KQ84 ♦ QJT5 ♣ KJ3
You have a pretty good hand, but partner’s hand is balanced and limited to 15 HCP. She’d need an awfully perfect hand for there to be a slam. You could make one move (with a 4♣ control-bid) and then sign off, but the practical bid is just 4♥.
♠ QJ6 ♥ AQ74 ♦ KQ98 ♣ 42
No chance of slam. Sign off in 4♥.
♠ AJ83 ♥ KQ75 ♦ Q5 ♣ AKJ
You still have good slam hopes. You can’t use RKB because you don’t have a control in diamonds. So make a control-bid of 4♣ and see what partner does.
Passed Hand Bidding
Jacoby 2NT does not apply by a passed hand (since a passed hand can’t have the values to force to game). You can use Drury to show a maximum hand with a fit by a passed hand.
In Competition
Jacoby 2NT is OFF in competition. This means that if partner opens 1M and RHO doubles or bids, 2NT is no longer Jacoby. If RHO bids a suit, 2NT is natural and invitational: i.e., 11‑12 HCP and a stopper. With a good hand and support, you would cuebid. If RHO doubles, 2NT becomes Jordan (a 4‑card raise with invitational or better values). While Jordan is similar to Jacoby 2NT – they both show 4‑card support for partner’s major – it is its own convention and needs to be thought of separately. Opener does not respond to it the same way she does to Jacoby 2NT. (A 3M bid, for example, needs to show a minimum, since Jordan is not GF.) Do not make the mistake of thinking you can add Jordan to your repertoire without any discussion just because you understand Jacoby 2NT.
If the opponents bid over 2NT, X is penalty and 3NT is shortness in their suit (you’re never playing 3NT when you have a 9‑card fit in a major). 4M is the weakest bid – a balanced minimum with poor defense. Pass is more forward going, suggesting more defense and/or playing strength. A new suit at the 3‑level is still shortness. New suits at the 4‑level are control-bids. These agreements are not standard, but I think they are best. The 3NT bid is alertable.
Examples:
The auction begins 1♠ (P) 2NT (3♦)
♠ KQT52 ♥ 6 ♦ A43 ♣ KJ64
Bid 3♥, showing shortness.
♠ AJ984 ♥ KJ2 ♦ 3 ♣ KQ87
Bid 3NT, showing shortness in their suit (diamonds). This is alertable.
♠ KJ965 ♥ KQ5 ♦ 87 ♣ K43
Bid 4♠. You have a minimum with no slam interest and no interest in defending 3♦ doubled.
♠ AJ652 ♥ AQ54 ♦ 84 ♣ K2
Pass. You have a decent minimum (you would have bid 3NT had RHO passed).
♠ KQJ65 ♥ A3 ♦ A2 ♣ QJ98
Bid 4♦, a control-bid. You have a good hand and have some slam interest. The 4♦ control-bid pinpoints your lack of a club control, so partner will know to sign off if she also lacks a control in clubs.
♠ AJ743 ♥ 2 ♦ AQ84 ♣ K65
RHO might have just stepped in it! Make a penalty double.