Posted 2013-March-19, 10:49
I can't imagine partner passing instead of 2♠; but he's almost certainly on the "non-constructive/constructive/limit" spectrum.
The problem is that although yes, partner could have been thinking of 1NT vs 2♠ (especially with, say, a 6-ish with 4), or that partner could have one of those "too good/flat for 4, but 5 trump and how do I get to game without being in 6?" hands, it's most likely that partner has one of those bad limit raises ("we play 2♠ 8-10, and I have an aceless crappy 11, or I have a decent 10 with 4-card support")
The British have case law, I believe, that suggests that hesitations in these cases are deemed to show extras. Without that, the issue is that it can't *demonstrably* suggest extra values, especially if someone would argue that if it turned out that opener passed with a Q more or so and partner did have the "good bad single raise" that the hesitation suggested that partner didn't have enough and would enforce a game try.
One of *my* rules, which seems to be obvious given the switch to "demonstrably" suggested, is that there has to be a safe call. If we'll enforce a game try opposite a borderline minimum, we can't deny a game try opposite a borderline maximum, or we're back to "if it hesitates, shoot it".
Without the UI, I'm aggressive, I make the 3♣ call. Yes, it has downsides, especially when I get to play 3♠ as opposed to 1♠-2♠-p balanced into 3♠ (am I really going to get to play 2-of-a-fit with this hand?) But when partner has nothing wasted in clubs, he'll have help for me in the reds (I hope; but I'm also derided as too pessimistic, so I'm going to hope this time).
However, IMPs or MPs? How good am I/the field? Almost certainly that would make a difference.
When I go to sea, don't fear for me, Fear For The Storm -- Birdie and the Swansong (tSCoSI)