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North South played 2/1.
East dealt and passed, South opened 1D, West passed and North respond 2C, and East interfered with 2H:
1) Do you agree with North's 2♣?
Yes, I agree with 2
♣. North has a solid hand, and no reason to distort the bidding with anything else.
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South should show support with support and bid 3
♣. South has nothing to be embarrased about. EW have a likey minimum 9 card spade fit they have not mentioned (although partner could have 4
♠ but only with very good hand). JTx of clubs is great support and this hand is far from a minimum. For Zar fans it has 12 hcp but also 4 Control points and 14 distributional points for a solid 30 Zar points (a king more than mininium), then with the club fit, it gets two more points for JACK and Ten of clubs and a point for the singleton spade. coming to 33. Equavalent to an AQ or AJ more than minimum if you are a hcp counter.
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3) For the sake of convenience, assume South passed (West passed also) and North dbled (East also passed). What should South do? do you agree with south's pass?
South should not have passed for convenience or otherwise. But if he did and north doubled now 3
♣ is a huge underbid. This is nice hand in support of clubs. This is why pass was wrong. With AJx the hand looks suitable for a notrump bid, but this hand isn't so notrump orienentied. But 4
♣ may shoot you past 3NT. There is no good bid now (3C underbid, 3NT hand is wrong, 4C takes you past 3NT which might be where you belong, 3D you got to be kidding -- are EVER going to show your club support and extra values, 3H - what will partner take this as, 2NT -yuck but might be my choice and if not 2NT then 3NT - which given the first pass maybe the only reasonable choice left at this point.
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4) Again, assume South bid 3D (do you agree?) Which bid would you choose?
ABSOLUTELY NOT... Don't you see you have crappy diamonds and club support? If my partner bid 3
♦ I held north's hand I would give and pass if 2
♣ was not game forcing. If 2
♣ was quasi game forcing (to 3NT or 4 of a minor), I would cue-bid 3
♥.
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5) North passed South's 3D, do you agree?
I think pass of 3
♦ is acceptable given the misfit auction and suggestion of weakness that south choose to use instead of the honest support with support auction he had available. Look how much EASIER the auction is if south simply does the right thing and raises to 3
♣ directly over 2
♥'s.
So if I was to assign the blame, south would get most because he counted his hcp and assumed this hand was a minimum, in fact when it wasn't and because he hid his fit with his partner for no apparently good reason.