Fluffy, on 2011-April-06, 04:00, said:
Why the queen?, what happens with the Jack? it will also sometimes be the key, even the 10 might one day be the entry. All can be codified, but the problem is, how much is codified with a partner whoom you never talked about it?
I think that an encouraging discard in the suit is more positive than a suit preference for that suit.
Give that, it would normally be as I suggested in my earlier post: with A or K, he knows it's safe to encourage, so he throws a low heart; with Q, where he's not sure, he gives suit preference in another suit. With the jack maybe he'd throw a middle club.
In this particular situation, declarer is known not to have A or K. Hence an encouraging heart should show the queen, and a suit preference for hearts should show the jack. However, partner obviously doesn't think that.
I don't think we should expect partner to throw a discouraging heart. In general it's unwise to allow declarer to isolate the heart guard in one hand. Even we can both work out that on this particular deal it's safe to do that, I don't think we should change the meanings of all our other signals because of that.