The Jacoby 2NT convention is an artificial, game-forcing response to a 1
opening bid. The 2NT response shows 4+ trump support with 13+ points. The bid asks partner to describe her hand further so that slam prospects can be judged accordingly.
In his 1970 book "Win at Bridge with Jacoby Modern", Oswald Jacoby listed a couple caveats for bidding 2NT:
- Responder's 13+ points should include at least 11 HCP.
- Strong 3-card support is acceptable, e.g. 2 of the top 3 trump honors
Jacoby 2NT is intended for 5-card major systems that employ limit raises
for game invitations. Thus, it fills the need for a game-forcing raise with unlimited strength. The convention doesn't come up often, but is precious in its role.
In ACBL games, Jacoby 2NT is alertable.
After the auction begins 1/
: 2NT, opener's rebids are as follows.
The Priority of Opener's Rebids
Many of the above bids overlap. For example, opener might have 5-5-2-1 shape with only 12 points. Should she bid the side suit, show the singleton, or jump to game?
The priority of responses are:
- Showing a 5-card side suit.
- Showing a singleton or void.
- Bidding 3NT with a balanced 14-15 points.
- Jumping to 4 of the agreed major with 12-14 points.
- Bidding 3 of the agreed major with 16+ points and no other suitable call.
- After any 3-level rebid by opener, responder can bid any suit (besides the agreed trump suit) to show a first-round control - i.e. an ace or void.
- After ANY rebid by opener, 4NT is Blackwood (or Roman Key Card Blackwood).
2NT by a passed hand
Jacoby 2NT is off when responder originally passed. In that situation, 2NT is natural and non-forcing, showing a balanced 11-12 HCP.
- 12+ points and 5+ spades
- Jacoby 2NT showing 13+ points and 4+ spades - game forcing!
- A diamond singleton or void
- First-round diamond control
- First-round heart control
- A willingness to stop in game, implying that the club suit as a concern. With a club ace or void, responder would have bid 4 instead of 4.
- Opener does not have anything extra to show, and is satisfied with game.
Jacoby 2NT is off when the opponents intervene over 1/.
In that situation, a 2NT bid by responder is commonly used as a limit raise (the Jordan 2NT convention
The Jacoby 2NT convention is named for its American inventor Oswald Jacoby
. See also Jacoby Transfers