User:Brian/Bridge/Opener's rebids following one-over-one

Partner's response shows 4+ of the bid suit and 6+ HCP. It is unlimited and one-round-forcing (that is, you are not allowed to pass).

If partner bid a major, the first priority should be supporting that major if possible.

Partner bid a major and I have 4+-card support with 15- total points → Bid 2M.

Partner bid a major and I have 4+-card support with 16–18 total points → Bid 3M.

Partner bid a major and I have 4+-card support with 19+ total points and a void or small singleton in a side suit → Jump shift into the side suit, showing a splinter.

Partner bid a major and I have 4+-card support with 19+ total points and no slam interest → Sign off in 4M. If partner bids again, it is a control bid or Blackwood.

Partner bid a major and I have 4+-card support with 19+ total points and slam interest → Make a control bid or bid 4NT.

I have a one-suited hand with 16- total points → Rebid your suit.

I have a one-suited hand with 17+ total points → Jump-rebid your suit.

I have a 4+-card suit higher than partner's suit with 16- HCP → Show the new suit.

I have a balanced hand with 12–14 HCP, or my only shortness is in partner's suit → Rebid 1NT.

I have a balanced hand with 18–19 HCP, or my only shortness is in partner's suit → Rebid 2NT.

I have a balanced hand with 20+ HCP, or my only shortness is in partner's suit → Rebid 3NT.

I have 4+-card support for partner's diamonds → (TODO: Analogous to raising partner's major? Except in this case we want to avoid bypassing 3NT. I don't think I ever learned the standard rebids for this case...)

I have 5+ of the suit I opened and 4+ of a lower suit with 19+ total points → Jump-shift into your other suit (i.e., bid it at the 3 level).

I have 5+ of the suit I opened and 4+ of a lower suit with 18- total points → Bid 2 of the new suit.

I have 5+ of the suit I opened and a 4-card suit higher than the one I opened, with 17+ total points → Bid your other suit. (This is called a reverse.)

Otherwise:

• Do you have a balanced hand with 15–17 HCP? Next time remember to open 1NT to avoid rebid problems. 1NT openings lend themselves to the most precise and well-understood bidding sequences.
• There are some weird distributions where you don't have a good rebid. For example, 4441 distributions often pose problems. If you have 1 spade, 4 hearts, 4 diamonds, and 4 clubs with 15 to 16 HCP, you open 1♦, and partner responds 1♠, none of the above options applies. You couldn't have opened 1NT with the singleton, a 1NT rebid at this point would be an underbid, 2♣ would mislead partner into thinking you have 5 diamonds, and 2♥ would show reverse-worthy strength. What do you do? Use your judgement and pick the least bad option, all things considered. Likewise, with 17+ HCP, 4 spades, 4 hearts, 1 diamond, and 4 clubs, if you open 1♣ and partner responds 1♦, a 1♥ or 1♠ rebid would be an underbid and a 2♥ or 2♠ response would misstate your distribution. This latter case is solved by the "Multi 2♦" convention, which is not discussed here.