Opener Shows Shape
After a 2/1 sequence such as 1♠- p - 2♣, the emphasis is on opener showing shape rather than strength; the bidding won’t stop below game, and strength can be shown later. Opener rebids are:
Rebidding own suit is usually (but not always) six +cards, any strength: eg.♠KJ10742 ♥AK3 ♦6 ♣Q53: (1♠- p - 2♣- p - 2♠)
Jump rebidding is a solid six+ card suit: e.g. ♠AKQJ74 ♥AK3 ♦6 ♣543: (1♠- p - 2♣- p - 3♠)
Raising responder’s suit is four cards (or three good ones): eg ♠KJ1074 ♥A6 ♦K3 ♣Q532 (1♠- p - 2♣- p -3♣)
Bidding a new suit at the two-level is four+ cards in the new suit, any strength: e.g.♠KJ1074 ♥7 ♦AK32 ♣Q65: (1♠- p - 2 ♣- p - 2♦)
Bidding no trumps is balanced, 12-14 or 18-19: e.g. ♠K87 ♥AJ942 ♦K97 ♣J4 (1♥- p - 2 ♣- p - 2NT - p - 3NT)
Points to consider
Although opener will rebid shape before strength, there are some exceptions:
1. Opener’s reverse, eg, 1♥- p - 2♣- p - 2♠. Although opener doesn’t need as much for this as the 17+ required in Standard, the reverse should be made on hands with around 14+, or very distributional hands. With absolute minimums it’s better to rebid the first suit, and show the four-card suit later, e.g., 1♥- p - 2♣- p - 2♥- p - 2NT- p - 3♠.
2. Opener rebids a new suit at the three level, e.g.,1♠- p - 2♦- p - 3♣. Like a reverse, this gets the auction to the three level and shows 14+. With only 11-13 it’s better to rebid the opened suit, and show the shape later, e.g., 1♠- p - 2♦- p - 2♠- p - 2NT- p - 3♣.
3. A 2♥ response to opener’s 1♠ bid promises a five+ card heart suit, but a 2♣ or 2♦ response promise only four+ cards.
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