User:Brian/Bridge/Rebids after opening one of a major

This page is incomplete.

If...	then...
Partner responded 2M, 3M, 2NT, or 3NT	These responses all show support for your major. See Subsequent bidding after major suit agreement
Partner responded 4M	Pass. The 4M response is preemptive and shows 5+ card support with very little strength. This is an instance of the "slow shows, fast denies" principle—if partner actually had a game-forcing hand, they would have made a different response in order to leave room for investigating the possibility of slam.
Partner made a double jump shift	This is a splinter. Alert the bid, then see Responding to a splinter.
Partner responded 1♠ to my 1♥	See Opener's rebids following 1/1.
Partner responded 2 of a lower suit and is an unpassed hand	See Opener's rebids following 2/1.
Partner responded 2 of a lower suit and is a passed hand	See Opener's rebids after non-game-forcing 2/1.
Partner bid 1NT	This shows 6 to 12 HCP. Announce "semi-forcing", then see the section below on how to show both strength and distribution with rebids.
Partner responded 4NT	This is Blackwood.

If...	then...
I have a one-suited hand with 16- total points	Rebid your major.
I have a one-suited hand with 17+ total points	Jump-rebid your major.
I have a lower 4-card suit with 18- total points	Bid your other suit.
I have a lower 4-card suit with 19+ total points	Jump-shift into your other suit (i.e., bid it at the 3 level).
I have a higher 4-card suit with 17+ total points	Bid your other suit. (This is called a reverse.)
I have a higher 4-card suit with 16- total points	Don't bid the other suit, i.e., spades; your partner's 1NT response has already denied 4 spades, and you are not strong enough for a reverse. Instead, keep reading...
I have a balanced hand with 17-18 HCP	Respond 2NT, which is an invitation to 3NT.
I have a balanced hand with 19+ HCP	Respond 3NT.
I have a balanced hand with minimum opening strength (12 to 14 HCP)	Pass. Your partner has 12- HCP, so you most likely don't have a game... so stopping in 1NT isn't the worst thing you can do.
Otherwise (intermediate strength with no lower 4-card suit)	Bid a lower 3-card suit. (Yes, bidding a 3-card suit sucks. Opening 1NT with 5332 and 5422 distributions is a great way to reduce the number of situations where you have to do this. 5431 distributions with 5 hearts and 4 spades remain problematic, but that's the price to pay for playing a 2/1 system.)