1NT OPENER'S RESPONSES TO A THREE-LEVEL SPLINTER

simple suit responseBidding 4-card suits up the line, looking for a trump fit, except that if opener's immediate "simple suit response" is the highest of the three available suits then it's not a suggestion but an order (and if four of a minor, also Minorwood). The partnership can agree the last-suggested suit by rebidding the splinter suit.
Jump shiftfixes trumps, asks about responder's Key Cards
3NTto play
4NTRKC Blackwood for the highest of the three suits
Cue-bid splinter suitordinary Blackwood, i.e. not Key-Card
Pass after lead-directing doubleAsking partner to describe his hand further, i.e. either raise the splinter suit if holding a void, bid a five-card suit or else 3NT if 4441.
Redouble after lead-directing doubleTo play despite partner's known singleton, very strong suit.
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Copyright 2015 Finn Clark.