(1) I'd overcall 2
♣ at any form of scoring and any vulnerability.
The worry about being raised to game puzzles me. When one of the opponents has an opening bid and a balanced hand, game for our side isn't very common. In my experience, when they open a 12-14 notrump, it'll be a partscore deal at least 10 times as often as we have a game. Your main objective when you come in should be to compete the partscore, and your style should be geared to that objective.
(2) For the same reason, if you pass over 1NT it's clear to bid 2H on the next round.
(3) Passing a third time times is madness. I have KJ109x in a major and have spurned two opportunities to show them. Now partner positively encourages me to to bid, and I decide I'd rather defend with A222 opposite a singleton?
Partner's typical minimum is a 1363 13-count. If he has that, the opponents bidding doesn't quite add up, so maybe he is 1264 with
♥Hx.
4
♥ might be awkward to play, so I think it's enough to bid 2NT (scrambling), then 3
♥ over 3
♣ to show a game try. If partner replies 3
♦ to my 2NT, I'll bid 4
♥, because now there's more reason to expect three hearts. But I wouldn't have started from here.
This post has been edited by gnasher: 2010-January-20, 05:24
(1N)# - [1] - (2♣) - 2♦;
(P) - [2] - (2♠) - Dbl;
(P) - [3]