Posted 2019-March-11, 13:08
I agree with Tramticket and, hence, with Cherdano. I add, however, that it is common to play that a reopening 3D, jump overcall in passout seat, shows a solid opening hand with 6+ diamonds.
It is for this reason that the double and then 3D shows the hand values well: were South to merely have, say, a good 14 with those diamonds, his correct action would have been a balancing 3D.
All of this means that South, over 3H, can pass, knowing that he has shown his full offensive power (that spade AQ isn't worth much, assuming that declarer either buys a stiff in dummy, such that one of our cards is ruffed out, or gets an entry and uses it in spades, not trump.
Now, this does not give North a free pass, with Qxxx in a suit partner almost surely has at least 6 cards, and her spade holding is the worst imaginable.
Whether, absent a double of 3H, North should compete to 4D is less easy to say. Most solid opponents would already be in game if game was reasonable, but sometimes they will have taken the low road and then be pushed, if only because they think that 4H, if it fails, may be cheaper than defending 4D. Less solid opps are more prone to have missed the game and then be pushed there. If I trust my opps, I will bid 4d, but with a queasy feeling since I don't have much defence....although the heart queen is a likely trick.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari