bravejason, on 2018-February-06, 11:44, said:
Off topic from the OP, but a pair of questions I'd like ask. First, Instead of 2NT should South have bid 5 clubs?
No. 5c is premature. There are a ton of hands where 3nt or 4s may be better contracts than 5c, where the opps have say 3 tricks off the top but you have the rest.
South should bid some cheap forcing bid to find out more about opener's hand. Typically this would be 2d, a new suit, forcing one round (new suit by unpassed hand is by default forcing 1rd after a non 1nt rebid, without specialized agreements). Some segment of players play this particular bid, 2d on this sequence, as GF (aka Bourke relay). 3c as a forcing bid could also work, but only a small minority of players play this as forcing (with prior agreement), most use it as invitational only so South would be way too strong for this.
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Second, doesn't 2NT by responder invite game in no trump and ask North to either bid 3NT or 5 clubs? Maybe I'm misunderstanding something but I thought responders 2NT in a sequence like this was a strong bid.
It's usually an *invitational* bid, forward going, but not FORCING. It asks North to bid game in NT if more than minimum. North is expected to bid 3nt, pass with a min, or retreat to 3c with a distributional min that thinks it's safer in 3c than 2nt. It would be extremely unusual for North to accept with 5c, because on this sequence both hands are limited, 11 tricks is a lot more than 9, and it's pretty hard to construct hands where there are 11 tricks in clubs but < 9 in NT. Those are typically very distributional hands with big fits, and 2nt isn't supposed to be that type of hand.
South on the posted hand is way too strong to bid 2nt with normal methods where 2nt is inv.