User:Brian/Bridge/Rebids after a 1NT opening

See Responding to a 1NT opening for an explanation of the Stayman convention and Jacoby transfers.

Without interference

Stayman sequences

If partner responded 2♣, it is Stayman, asking for a 4-card major.

I have 4+ hearts → Bid 2♥.

• If partner responds 2♠, it means they have 4 spades, 3- hearts, and invitational strength. Sign off in 2NT, 3♠, 3NT, or 4♠, depending on your strength and whether you have 4-card spade support.
• If partner responds 2NT, it means they have no 4-card major (the Stayman was "fake") but invitational strength. Pass or sign off in 3NT.
• If partner responds 3♥, it means they have 4+ hearts and invitational strength. Pass or sign off by raising to 4♥.
• If partner responds 3♠, it is a slam try showing agreement in hearts. Alert partner's bid. With a minimum, respond 4♥. If partner bids again, it is a control bid or Blackwood. With a better hand, initiate control bidding or bid 4NT, Blackwood.
• If partner responds 3NT, it means they have game-forcing strength, 4 spades, and 3- hearts. Pass or sign off in 4&spades.
• If partner responds 4♥, it is a sign-off.
• If partner responds 4NT, 5NT, 6NT, or 7NT, it is quantitative and shows 4 spades. Pass or make a sign-off either in notrump or spades.

I have 4+ spades → Bid 2♠.

• If partner responds 2NT, they show invitational strength without 4-card spade support. Pass or sign off in 3NT.
• If partner responds 3NT, they show game-forcing strength without 4-card spade support. Pass.
• In all other cases, the subsequent bidding is the same as in the previous paragraph, but exchange "spades" and "hearts".

I have no 4-card major → Bid 2♦.

• If partner responds 2M, they show invitational strength with 5 of the bid major and 4 of the unbid major. Sign off in 2NT, 3M, 3NT, or 4M, depending on your strength and whether you have 3-card support for partner's 5-card major.
• If partner responds 2NT, they have invitational strength. Pass or sign off in 3NT.
• If partner responds 3M, they show game-forcing strength with 5 of the other major (oM) and 4 of the bid major. With 3-card support for oM, raise to 4oM; if partner bids again, it is a control bid or Blackwood. Otherwise, rebid 3NT; if partner bids again, it is a quantitative raise.
• If partner responds 3NT, it is a sign-off. Pass.
• If partner responds 4NT, 5NT, 6NT, or 7NT, it is quantitative.

Jacoby transfer sequences

If partner responded 2♦, it shows 5+ hearts. If partner responded 2♥, it shows 5+ spades. In either case, announce "transfer" when partner makes their bid. We will denote partner's 5-card major by "M".

I have 17 HCP with 4+ of M → Superaccept by bidding 3M.

• If partner responds 4M, it is a sign-off.
• Any other response by partner is a slam try: either a control bid or Blackwood.

Otherwise, if M is ♥ (partner's bid was 2♦) → Accept by bidding 2♥.

• If partner responds 2♠, they have invitational strength with 5-5 in the majors. Pass with a minimum, sign off in 2NT or 3NT to deny 3-card support for both majors, or support either major if possible by signing off in 3 or 4 of the major you want to support.
• If partner responds 3♥, they have invitational strength with 6 hearts. Pass or sign off by raising to 4♥.
• If partner responds with notrump, it is quantitative and shows exactly 5 hearts. With 3-card support, sign off in hearts at the appropriate level. Without 3-card support, pass or sign off in notrump at the appropriate level.

• One common case is that the response is 2NT, showing invitational strength and exactly 5 hearts. Pass or sign off in 3♥, 3NT, or 4♥.
• Another common case is 3NT, showing game-forcing strength and exactly 5 hearts. Pass or sign off in 4♥.

Otherwise, if M is ♠ (partner's bid was 2♥) → Accept by bidding 2♠.

• If partner responds 3♥, they have game-forcing strength with 5-5 in the majors. With 3-card support for either major, raise to 4 of the major; any subsequent bid by partner is either a control bid or Blackwood. If you can't support either major, rebid 3NT; any subsequent bid by partner is quantitative.
• For all other responses, see the previous paragraph, but exchange "spades" and "hearts".

Other responses

My partner responded notrump → This is a quantitative raise. Most commonly, this will be 2NT or 3NT. 2NT is invitational to 3NT, while 3NT is to play.

My partner responded 4♣ → See Responding to Gerber.

My partner responded 4♦ or 4♥ → Announce "transfer" then accept the transfer by bidding 4 of the next suit. This is a Texas transfer showing 6 of the major transferred to.

• Most of the time, partner will pass.
• If partner bids again, it is a slam try: either a control bid or Blackwood.