OK, with some I have the agreement that 3♥ shows a spade fit and asks for a heart lead if we defend. But we are not playing that, so I can bid 3♥ to show hearts. Without the double I treat 3♥ as forcing, and I believe partner does. But with the double? I would think not. But we are vul and I have some tricks, so maybe I should just pass and trust partner's suit is good enough to bring in 8 tricks.
I couldn't help myself, I bid 3♥.
Here are the hands.
Result: +140, lose an imp.
The opening lead was the ♦ J after which there are five obvious tricks to lose but the defense slipped up. Sounds like a good result? Well, some are in 4♥ making. Gib says there are ten tricks in hearts and, given a bit of inspired play in the diamond suit, this seems right. If the defense leads a trump at trick 1, it appears that there are 11 tricks.
Upon reflection:
1. How do you play 3♥ in this auction, forcing or not, showing spade support or not?
2. Would you open the N hand 2♠, given we are vul, they are not. I wouldn't, but many do.
3. 4♥ making is obviously a bit lucky on these cards but given that, red against white, 2♠ presumably has some decent values, would it be crazy to bid 4♥ instead of 3♥?
4. Suppose 3♥ is available to you as a non-forcing bid at your first call. Pass it also available to you. Your call?
5. Suppose (change the hands if you need to) that you pass the double. Suppose the opponents are playing Leb over the X, W calls 2NT, partner passes, E bids 3♣. What would 3♥ by S now show? Edit: Obviously it would not show this hand since, as has been strongly mentioned, I would hit 3♣. But the question remains what passing and then coming in, not with spades, over a Leb 3♣, should show.
6. Any other thoughts?