billw55, on Feb 22 2010, 12:14 PM, said:
IMO, game tries don't exist in a vacuum; by this, I mean that a bid asking for help in diamonds doesn't JUST mean "Bid game if you have diamond help, and don't if you don't." The game try exists in the context of the general strength of hands in a particular range, whether it's 3-7, 6-10, or whatever. In practical terms, this means something like (make up your own numbers here):
15% of hands in the range are too bad to accept pretty much ANY game try, i.e. the question of help in a particular suit is irrelevant - if partner wants to be in game opposite a hand this bad, he has to suck it up and bid it himself;
10% of hands in the range are good enough to be in game opposite ANY game try - these are the hands that really only didn't make a limit raise on a mental coin flip, and if partner is interested in game, you want to be there - the question of help in a particular suit is irrelevant.
75% of hands are neither good enough nor bad enough for me to make the decision unilaterally. On these hands, and only these hands, do we address the question of help in a particular suit. The 3♦ bid essentially means something more cooperative, like, "If you think game might be reasonable, but you're not sure, evaluate based on your diamonds, and make a final decision." (or re-punt with 3♥.
The given hand is one of the first group of hands - it's so bad, even within the context of a 3-7 range, that I don't address the diamond question. I think given that the range is 3-7 and not 6-10, you might come to a different conclusion - it does have a 4th trump and a doubleton. But it's still pretty bad.
The specific answer, though, is less important than the process. It's not a 1-step process (bid game or don't). It's a 2-step process (evaluate whether game is potentially reasonable based on partner's failure to bid it himself and my advertised range; THEN evaluate my diamonds).

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