OVERCALLS WHEN THE OPPONENTS HAVE BID TWO DIFFERENT SUITS NATURALLY (ISH)

Any bid in the pass-out seatA king weaker than when bid directly.
DoubleOne of two hand types. DEFAULT ASSUMPTION: take-out, opening strength, support for unbid suits. This is a "say it once and shut up" bid that thereafter leaves all competitive decisions to partner and the doubler is not expected to bid again unless partner finds a bid that asks them to do so. To do so shows extreme strength (17+) and previous assumptions about shape no longer apply. NOTE: this bid promises proper opening values (i.e. you'd been going to open the bidding if the opponents had passed) AND support for the unbid suits. Opening a 4441 10-count "because the shape is perfect" is a violation of all that is good and will cause cancer in kittens.
Cue bidnatural overcall, to play
Suit overcall5-card suit, strength depends on vulnerability and level
Jump suit overcallWeak Two, 6-10 and a 6-card suit
Greater jump suit overcallPre-emptive
1NT from a passed hand (protective)Stretching with a good eleven-count and the usual transferred-king principle.
1NT from a passed hand (non-protective)5-5 shape and a distribution that can't be shown with either Unusual 2NT or Michaels, e.g. the black suits after a diamond opening. If there's no such unshowable distribution (i.e. after a major opening), it's the LOWER of the two Michaels options, i.e. (1S) passed-hand-1NT would show clubs+hearts.
1NT15-17, natural, with a useful holding in any opposition suits. Responses are the same as after a 1NT opening bid.
2NT5-5 in the two unbid suits
Jump to 3-level cue bidasking partner to bid 3NT if they have a stopper in this suit
Jump to 3NTTo play, long running minor.
4NTAcol 4NT, asking for specific aces
5NTasking for specific kings
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Copyright 2015 Finn Clark.