[Trinidad]

jodepp, on 2015-July-13, 13:42, said:

This hand has lots of potential as constructed so I guess I would use Drury, but I also have sympathy for 1♠-then-later-raise hearts. I almost always like to describe where my side values lie when I have a fir, something Drury doesn't do.

So, if you would bid 1♠, how will you "raise hearts" later?

If you rebid 2♥ then that isn't a raise, it is merely showing preference (typically with two hearts only instead of four).
If you rebid 3♥ then that could be construed as a raise, but it will get you to the three level.

And finally, you may not get to raise hearts, because 1♠ is not forcing. You may play 1♠ in a 4-3 fit when you likely had a 5-4 heart fit.

So, a non forcing 1♠ response is not an option when you have four card heart support. If you want to show your spades (and that may not be a bad idea) you can only do that after you raised hearts and your partner gives you the opportunity. And if the hand were just a bit stronger, the forcing character of Drury achieves just that: You would bid 2♣ and if partner rebids 2♦, you will make a game try with 2♠. If the hand would be still stronger (say 5413) you could even do that when partner rebids 2♥.

Rik