Note: This page is incomplete - only the rebids after partner showed a major suit at the 1 level are displayed for now.
If you opened 1♦ and your partner made a first response, you should have a pretty good idea of where you are going. Your first responsibility is to show support for your partner's major, if you can, and to describe your hand otherwise.
Rebids by the 1♦ opener after the bidding sequence 1♦ - 1♥/1♠ by partner
|1♠/2♠ (after partner's 1♥)||12-16 DP / 17+ DP, 4 spades, probably 0-3 hearts.||With 4-4-3-2 distribution, prefer 1NT. On the other hand, you may prefer to show your spades even if you have 4 small hearts.|
|1NT||13-15 HCP, balanced or semi-balanced distribution, less than 4 cards in partner's major.||You almost certainly have 3 cards in your partner's major suit.|
|2♣||4+ clubs, probably with 5 diamonds and 4 clubs, although a 4-4-4-1 distribution is also possible if the singleton is a heart, and partner has bid 1♠. Up to 16 HCP.|
|2♦||At least 5, but more likely 6+ diamonds, 12-16 DP. Inability to support partner's major or to bid the other major.|
|2♥ (after partner's 1♠)||Strong 2-4 card heart suit, fewer than 4 spades, 17+ HCP.||Strong interest in 2/3NT but worries about one of the unbid suits.<7td>7td>|
|Raise to 2/3/4 of partner' major||12-16 SP/17-18 SP/19+ SP, 4-card support.||.|
|2NT||19-20 HCP, balanced or semi-balanced distribution, less than 4 cards in partner's major.||You almost certainly have 3 cards in your partner's major suit.|
|3♣||4+ clubs, probably with 5 diamonds and 4 clubs, although a 4-4-4-1 distribution is also possible if the singleton is a heart, and partner has bid 1♠. 17+ HCP.|
|3♦||17+ DP. 5+, preferably 6+ diamonds, no support for partner's major suit.||With 5-3-3-2 distribution, prefer 2NT.|
|3♥/3♠||20+ DP, 4-card suit (not the major bid by partner).||Easier way to show this kind of distribution than with opening with a forcing 2♣.|
|3NT||Solid 6+ card diamond suit, no 4-card major, and A or K in all side suits (singleton K not allowed)|
|4♦||Long solid or almost-solid diamond suit, no 4-card major, and 9 playing tricks.|
|4NT||Blackwood. Very strong try for 6♣ or 6NT.||All you care about is how many Aces opener has.|
If RHO makes a bid after partner's major-asking bid, your job is to describe your hand as well as you can. In many cases you can just bid as you would have bid otherwise, with maybe at one level up. In aiddtion, you have the paraphernalia of competitive bidding, such as passing, doubling, redoubling, making a cue-bid of opponent's suit, and using a NT bid to indicate some control of opponent's suit.
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