bid_em_up, on Mar 23 2009, 04:29 PM, said:
Well, as far as I knew, making a free bid such as 3D was encouraging (you do not have to bid in this position), and pass is the sign off (weak, your suit is known). And being systemically forced to make a call on a minimum hand in this auction is simply begging for a penalty double, imo.
2NT showed invitational values. If it had gone 2NT (pass), you wuld have been expected to bid more than 3♦ if you had a maximum. The 2NT bid announces that we don't have to worry about being doubled.
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The other auction you give is slightly different, I can agree with the meanings you give for pass, 2S, and 2 anything. But in this auction partner has already essentially committed your side to at least 2S. There is also something to be gained by bidding 2S with a weak hand immediately in this position, since if you pass, you give your LHO the opportunity to bid freely at the two level if they desired to do so. The same cannot be said of the problem auction.
Why not? In the problem auction:
- The 2NT bid has already committed our side to at least 3♦, given that we have diamonds.
- 3♦ is slightly more preemptive than pass, because it takes away a 3♦ cue bid.

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