Thanks for the replies and votes. Here are my thoughts.
On a bad day, when you bid 2
♥ you will be a 5-1 fit. [As partner has shown at least nine cards in the pointed suits and we have equal length in the other suits, partner's expected number of hearts is under 2.0, I claim.]
On a bad day, when you pass 2
♦you will be a 4-2 fit.
If you bid 2
♠ and partner passes you will probably be a 5-1 fit.
It's not a great problem to have, but how do the different potential six card fits compare?
4-2 fits do not normally play well. However, in this case at least we know that partner can win the presumed trump lead with the ace and perhaps score a quick spade ruff.
A 5-1 heart fit will not play too well as the trump suit is J98xx opposite a singleton. At least the quality of the trumps in the 5-1 fit will (usually) be better in spades.
JLOGIC, on 2012-May-11, 11:49, said:
Probably partner will pass with 5053 and I will regret this one
That's obviously the worst case scenario for 2
♥, but even when we strike lucky and partner likes hearts, 2
♥ will not necessarily lead to a good score, because partner will bid often bid on, expecting better hearts and/or more high cards.
When this came up, partner's hand was
♠A8653
♥A4
♦KQJ84
♣Q. Like
Phil352, my team-mate raised to 3
♥ and declarer could only manage 7 tricks even with trumps 3-3. At my table, a pair of Norwegian internationals bid uncontested 1
♠-1NT-2
♦-2
♥-4
♥.
When partner has a good hand, the very best way to stop partner bidding on is to not give him a chance to do so. So I suspect that passing 2
♦ is the best action here. With the same shape but a stronger hand (say an 8-count) now it makes a lot more sense to keep the bidding open.