Jinksy, on 2015-August-06, 13:29, said:
On the first, why are we bidding 3♦ when in a recent thread there was discussion about how neg Xes are more about the majors than minors, such that people thought (something like) 1♣ (2♠) X P / 3♦ showed extra values?
Ok here we've heard about both the majors, so P's X is obviously more minor-oriented than in the other thread, but I would still expect P to have 2Ss or a good hand with no better bid. Similarly(?) if my minors were reversed and it had just gone 1♠ P 2♦, I'd be rebidding spades to show a minimum (and, playing Acol, the unshown fifth spade). So what's so different here? And what would I do on a similar hand but with extras? Rebid 4♦? (and what if the extras still left it sub-GF - eg with the diamond King instead of the Jack - or whatever you think would constitute an intermediate hand.)
You are confusing some basic principles.
When one doubles a major suit overcall of partner's minor, it is normal to play that the double is all about the other major. We sacrifice the ability to show the other minor, because we have decided that showing the other major is so important that to require that we also hold the other minor when doing so is too constraining....we end up being unable to bid.
As opener, if we began with 1
♣, then anytime we bid diamonds naturally, with partner not having shown diamonds, we put responder in the position of having to raise the level if he doesn't like diamonds and needs to go back to clubs. This is the usual basis for requiring that we need extra values to show diamonds...we are making a reverse.
So your analogy to 1
♣ [2
♠] x [P] 3
♦ doesn't apply to the OP.
As for your second analogy, to 1
♠ [P] 2
♦ [P] 3
♣, again you miss a basic point. The 2
♦ call didn't promise any club or spade support at all. Therefore it makes sense to require extra strength for 3
♣, especially if 2
♦ was not, itself, a gf.
In the OP situation, partner has shown BOTH minors, or at least the ability to handle any call we make based on that assumption. Accordingly, it makes no sense at all to require extra strength to raise diamonds...a suit he has implicitly bid.
Take the auction 1
♠[P] 2
♦ [P]. Some play that raising to 3
♦ requires some extras, but everybody I have discussed this with would immediately say that holding 4 card support qualifies as extras in that context. Here, of course, partner didn't suggest a 5 card suit, as would many for a 2
♦ response but surely our holding a 5th diamond means something good?
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari
I rank
1. 3♦ = NAT. Descriptive for most players. Although, for some (including for some forum members, AFIR), rebidding a minor at the 3-level shows extra values.
2. 2♠ = NAT. Minimum with rebiddable suit. (playing 4-card majors)