OPENER'S REBID AFTER A 1NT RESPONSE

BIDOPENER'S REBID AFTER 1C-1NT, SHOWING A CLUB FITOPENER'S REBID AFTER 1D-1NT1C OPENER'S REBID AFTER A 7.5-10 CONSTRUCTIVE 1NT RESPONSE OVER AN OPPOSITION OVERCALL1D OPENER'S REBID AFTER A 7.5-10 CONSTRUCTIVE 1NT RESPONSE OVER AN OPPOSITION OVERCALLOPENER'S REBID AFTER 1H-1NTOPENER'S REBID AFTER 1S-1NT
pass after doubleA balanced 12-14 point hand with poor trumps and a preference for playing in 1NT rather than the club contract.Natural, nothing to say.
redoubleShows game-forcing strength and an interest in possibly doubling the opponents for penalties.Strong and unbalanced, shows interest in doubling the opponents for penalties and likely to hold values in any suit that partner has denied with their 1NT response.Strong and unbalanced, shows interest in doubling the opponents for penaltiesStrong and unbalanced, shows interest in doubling the opponents for penalties and likely to hold values in any suit that partner has denied with their 1NT response.
2CTo play, not promising any additional length since the partnership has a known club fit.Club fit, naturalnaturalnatural, unbalanced
New suitNatural (even if the opposition have overcalled in the suit), shows five of first-bid major and four of second suit.
Rebid6-card suit, denies en route second suit unless at least 7-4 shape.6-card suit, denies en route second suit unless at least 7-4 shape.
2D, 2H, 2SNatural (even if the opposition have overcalled in the suit), unbalanced, reversing strength
2DNatural reverse, showing 5-4 in the minors.
2HNatural (even if the opposition have overcalled in the suit), unbalanced, reversing strengthNatural (even if the opposition have overcalled in the suit), unbalanced, reversing strength
2SNatural (even if the opposition have overcalled in the suit), unbalanced, reversing strengthNatural (even if the opposition have overcalled in the suit), unbalanced, reversing strengthnatural, unbalanced, reversing strength (normally 16+)
2 of a majorNatural reverse, showing a second suit and 5-4 shape. (Doesn't promise a five-card major, even though responder's denied a four-card major.)
2NTGame-forcing, unbalancedGame-forcing, unbalanced.Invitational to 3NT. Game-forcing would have been more consistent with the rest of the system, mind you.Game-forcing, unbalanced.
3CTo play.Club fit, reversing strengthClub fit, reversing strength
Jump rebidGood 6-card suit, at least reversing strength. Any continuation over this by responder in an uncontested auction is game-forcing.Good 6-card suit, at least reversing strength. Any continuation over this by responder in an uncontested auction is game-forcing.
3 of a minorgame-forcing, 5+ hearts and 4+ of second suit, or 5-5 if a game-forcing 2NT rebid was available
New suit at 3 levelGame-forcing splinter, agreeing clubs.Auto-splinter, showing a singleton/void and a self-supporting trump suit. Game-forcing.
Jump shiftnatural, game-forcing
Jump shift above reverseClub fit, game-forcing splinterAuto-splinter, showing a singleton/void and a self-supporting trump suit. Game-forcing.
3NTto playTo play, with either: (a) a long running diamond suit, or (b) an extremely strong 4441 with a singleton club and no other rebid.to playTo play, with either: (a) a long running diamond suit, or (b) an extremely strong 4441 with a singleton club and no other rebid.Based on a long, solid suit, i.e. akin to the equivalent bid had the opening bid instead been one of a minor. Shows a hand with lots of tricks off the top (seven or eight if partner is weak). Any continuation except four of opener's suit is investigating slam.
4 of a new suitAuto-splinter, showing a singleton/void and a self-supporting trump suit. Game-forcing.
4CMinorwoodMinorwood
4 of a minorMinorwoodMinorwood
New suit at 4 levelExclusion Blackwood
Game-level rebidGood 7-card suit (missing at most one of the top four honours) that would be (a) happy in game opposite a void and (b) good for grand slam opposite that missing singleton honour. However the hand's nothing special in terms of high cards, probably 12-14 points or so.Good 7-card suit (missing at most one of the top four honours) that would be (a) happy in game opposite a void and (b) good for grand slam opposite that missing singleton honour. However the hand's nothing special in terms of high cards, probably 12-14 points or so.
4NTquantitative invitation to 6NT
5Cto playGood 7-card suit (missing at most one of the top four honours) that would be (a) happy in game opposite a void and (b) good for grand slam opposite that missing singleton honour.to play
5-level rebidquantitative invitation to 6 of suit
New suit at 5 levelComplete two-suiter. If the partnership had previously bid more than one suit and so there's ambiguity about which suits are being promised, then the other one is the first-bid suit of the player who just jumped.
Jump shift to Blackwood LevelExclusion BlackwoodExclusion Blackwood
5NTquantitative invitation to 7NT
Jump shift to Grand-Hunting LevelComplete two-suiter. If the partnership had previously bid more than one suit and so there's ambiguity about which suits are being promised, then the other one is the first-bid suit of the player who just jumped.Complete two-suiter. If the partnership had previously bid more than one suit and so there's ambiguity about which suits are being promised, then the other one is the first-bid suit of the player who just jumped.
Any slamNo systemic agreement; the natural interpretation
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Copyright 2015 Finn Clark.