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Detail specifications 12AP - Level 1 ★

The opener's rebid after a fitted 2NT response

The opener's rebid after a fitted 2NT response.
After an opening 1 of a major, the response 2NT is ultra precise :

4 cards in the major (and not 2, 4 or 5!)
12HCP
A balanced hand without a 5-card suit The 2NT response is a convention, and doesn't guarantee any stoppers. It's non-forcing and the opener can pass.

Problem E2232 The responder's 2NT bid indicates 11 HCP and 3 cards in hearts.

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Problem E2233
To show a 5-3 fit in hearts... and win the game.

The opener's rebid
The opener knows the exact strength of his partner.

With a minimum 12HCP opening, he passes if he's happy to play NT. With a minimum opening he can also conclude at 3 in the major, if he doesn't want to play NT. With a strong opening, he calls game without describing his hand to the opponents!

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Problème E5768
3 spades With this very ordinary hand, don't go to game. 3 spades is a conclusion.

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Problème E5770
4 spades. Try for game with this strong hand.

The opener's rebid

With game not sure, the opener can ask his partner if he has something good in his second suit (a sort of trial bid in a suit). He bids that suit. With a balanced hand and the honors sprinkled about, the opener can also propose game in NT. He bids 3NT. The partner either accepts the proposal or else bids 4 hearts or 4 spades. With a strong hand, the opener begins the controls or jumps to 4NT if he holds all the controls!

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Problème E5769
3 clubs A sort of trial bid showing he needs some backup in clubs.

The Opener's Rebid: Bidding the Other Major (an Infrequent Bid)
After a 2NT response, the opener's bid of the other major promises 4 cards in that second suit. This bid sometimes allows playing with 9 trumps in a 5-4 distribution!
Example: