Jump 2NT rebid = 17-18, systemically denies 4cM that could have been shown at 1-level as above. Now,
eg. 1C : 1S 2NT : 3C 3D : 3NT = impossible to have 4cH thus shows concern about H's. Typically 4-1-4-4 or 4-2-3-4.
Non-jump 2NT rebid = 15-20, GF not willing to commit hand to 3NT.
Jump 3NT rebid from 2-level =15-16 and a doubleton in responder's suit.
Jump 3NT rebid from 1-level = 19-20 and NO interest in other likely games.
1M : 2M = 5-9, new suit now is long suit trial. Further raise to 3M is pre-emptive.
1any : 1M 2M : 2NT = game try or better (F). With maximum bid past 3M; with minimum, rebid "any" or 3M with 4 trumps.
If a simple bid in the JS is 100%F then type(1) is excluded, Note: Rebid at 1-level is not regarded as 100% F.
eg. AQJxx 1C : 1H Q 2S x AKJ9xx
eg. AKx 1C : 1H AQxx 2S x Corollory: 1C : 1H AJT9x 4H = balancedish 19-20 pts.
eg. (a) AKx 1C : 1H (b) x 1H : 1S KQx 2S AJT9x 3C Ax KQx ATxx AJx
eg. x 1C : 1H xx 2S AKx AKQJxxx
eg. 1C : 1H 2S : 2NT 3C = type(4). 3D = type(3). 3H = type(2). 3S = type(1).
eg. 1H : 1S 3C : 3D = D value, denies 3cH or 5cS. 3H = 3cH. 3S = 5cS, denies 3cH. 3NT = unable to make a cheaper bid.A rebid of 3NT by opener shows hand type(3). ie: GUARANTEES either a 5cH suit or 3cM support for responder's major.
eg. 1H : 1S 3D : 3H 3S = S set, hand type(2). 3NT = hand type(3) only 4cH thus 3cS. Over which 4C/D/H are cues for S. 4C/H = hand type(3) with 5cH. Hearts are set.To jumpshift to the 3-level when a simple bid is 100% F shows either hand type(2) or hand type(3).
eg. 1C : 1H 3D : 3H 3NT = 19-20 with 3cH. Further bidding assumes H set. Other = type(2), H's set.To jumpshift to 3-level with type(3) when could have JS to 2-level denies control of the 2-level JS suit.
eg. 1C : 1H 2S bid this on Kx but if swap SK and Cx then AQx bid 3D. KQx AJxxxResponder shouldn't raise JS suit above 3NT unless he has 5c support. eg. 1H : 1S with AJxx bit 3NT not 4D. If opener 3D xx has types (1) or (2) he'll QJxx bid again. xxx
1C : 1S 3H : 4H exception, only shows 4cH but guarantees 5+S. Opener with first example in (3) can convert to 4S.
eg. 1D : 2C with x 3H AJx AKxxx KJxx.
egs. 1D : 2C AJx 1C : 1H 4H - 3S/4D = void. AQxxxx KJxx
1C : 1D/H/S and 1D : 1H/2/2C also 1D : 1H 4C 4D 1NT : 4D = 6cH+4cD.These sequences agree responder's suit and usually initiate cue bidding.
eg. 1C : 1H 1S : 3D = fragment, 4cS support. 4D = void, 4cS support.
eg. 1C : 1S 2D = with eg. hand in (4). 3C = marginal JS hand. 3NT = Pray.