GrahamJson, on 2016-June-13, 01:52, said:
I guess I am old fashioned, but I would have bid 4S first time around, particularly with an unfamiliar partner. It puts maximum pressure on oppo, and you will know what to do if they go to the five level. Partner should not bid on in front of you unless he has a very distributional hand.
As Terrence Reece said "A pre-empt that is known to be weak is a blunt sword." Playing 4S as a pre-empt in this position merely tells oppo that it is safe for them to go on.
I remember that phrase. If I recall correctly, he was speaking of agreements such as a player never having an outside Ace when pre-empting. I agree with reese on that. Not that TR cares one way or another whether I agree with him.
But here I think, after (1D)-1S-(3D) that I would like to indicate, if possible, that while 4S may be right it is also very possible that no one can make 4 of anything. Doubling and correcting 3H to 3S should do it. After this, partner can raise to 4S if his hand is suitable. He would be much more reluctant to do so if I just bid 3S.
So that's why I choose X over 3D instead of 3S over 3D, but of course you are speaking of 4S over 3D. As mentioned above, it does indeed depend on just what can be expected of partner for his 1S bid. Certainly others out there overcall 1S on hands where I would not, but I think there are hands where I would overcal 1S and still not have much of a play for ten tricks here. So that is my main reason for not bidding 4S right away. But I also think I would like a fourth spade to to bid 4S. I have often expressed skepticism about LOTT, and I make no claim that we know the total number of spades we have here or the total number of diamonds they have, but I still would like a fourth spade for my immediate jump to 4S.
So then why not pass or X the 4D? I like that fifth club on offense and I dislike it on defense.