pass after doublePartial support for partner's suit, i.e. three cards.
redoubleSignificant extra strength and not even partial support for partner's suit, i.e. either a singleton or doubleton. However not a void, because partner might gamble to play in the redoubled contract. Shows interest in doubling the opponents for penalties.
1NT12-14 balanced, denies spades
2 of minorNatural (even if the opposition have overcalled in the suit), 5-4 shape
Rebid6 hearts, single-suited
Raise4 spades, limit raise
2NTGame-forcing, unbalanced
3 of minorNatural (even if the opposition have overcalled in the suit), game-forcing, 5-4 shape
Jump rebid, e.g. 1H 1S 3HStrong (normally 16+) and single-suited, 6 hearts. Any continuation over this by responder in an uncontested auction is game-forcing.
Jump shiftnatural, game-forcing
Jump raise, e.g. 1H 1S 3Sstrong (normally 16+), 5 hearts and 4 spades
Unnecessary jump shift up to Splinter LevelSplinter, agreeing partner's trump suit and showing a small singleton or void. Splinters are normally game-forcing, but if two of them were available then the lower is merely invitational, e.g. 1C 1S 3D/4D are both splinters, since 1C 1S 2D would have been a reverse.
3NTBased 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 minorsplinter
Jump raise to gameTo play, shape rather than strength
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.
4NTRKC Blackwood for spades
5 of majorinviting slam, asking about trump quality
Jump shift to Blackwood LevelExclusion Blackwood
5NTGrand Slam Force
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.
Any slamNo systemic agreement; the natural interpretation
Copyright 2015 Finn Clark.