OPENER'S REBID AFTER A PASSED-HAND 2D, SHOWING AN INTERMEDIATE HAND WITH THREE-CARD SUPPORT FOR A MAJOR

Pass after doubleShows a non-horrible four-card suit, willing to play in the doubled conventional bid if partner has trumps too.
RedoubleTo play, good five-card suit, but partner's allowed to take it out if unsuitable.
New suitnatural and forcing, to be assumed to be a trial bid
2NTGame-invitational, showing an upper-range weak no trump with only four of the bid suit.
Jump shiftnatural, game-forcing
Jump shift below 4 of agreed suitsplinter
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.
3NTto play
Agreed suit, any level except 5to play
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
5-level rebidquantitative invitation to 6 of suit
Jump shift to Blackwood LevelExclusion Blackwood
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.