OPENER'S REBID AFTER 1S-1NT

pass after doubleNatural, nothing to say.
redoubleStrong 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.
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.
2NTGame-forcing, unbalanced.
Jump rebidGood 6-card suit, at least reversing strength. Any continuation over this by responder in an uncontested auction is game-forcing.
Jump shiftnatural, game-forcing
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 a new suitAuto-splinter, showing a singleton/void and a self-supporting trump suit. Game-forcing.
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.
4NTquantitative invitation to 6NT
5-level rebidquantitative invitation to 6 of suit
Jump shift to Blackwood LevelExclusion 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.
Any slamNo systemic agreement; the natural interpretation
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Copyright 2015 Finn Clark.