32519, on 2014-February-19, 11:44, said:
Standard bidders will open the auction with 1♦ and jump to 3♣ second time round to show these sorts of hand patterns and HCP held. So you end up at the same level in the same bid second time round anyway.
However…
In the modern game, bidding is getting more and more aggressive. On iffish hands and favourable vulnerability, the opponent in the direct seat gets an opportunity to show a major suit on level-1. Every time he finds a fit with partner, pre-emptive jumps, cue-bid raises etc are all possible, jamming the auction before your side gets an opportunity to describe your hand pattern and HCP held effectively.
So…
If you still haven’t figured it out, by opening the bidding with (what is 25% of the time) an artificial 2♦ (the other 75% it is a natural 2♦), my side is gaining…
1. The whole of level-1 and 40% of level-2 has been taken away from the opponents. The player in the direct seat is less likely to enter the auction with an iffish hand. Often, that in itself gives an indication of the HCP spread.
2. In an uncontested auction, the bidding is forcing for one round. Depending on the actual hand pattern and HCP held by responder, he gets an uncontested first round bid to best describe his hand. These could be any of the following –
a. Pass with a hand completely useless outside of a ♦ contract. If he does pass, the player sitting in the fourth seat is under tremendous pressure to balance without any other natural or obvious bid available. Through passing the opening bid in third seat, the player sitting fourth can be pretty darn sure that he is running into one of the strong hand patterns SITTING BEHIND HIM!! Not nice!
b. Bid your longest major first
c. Bid 2NT with 10-13 HCP, suit length and HCP concentrated in the minors
d. Bid 3♣ with a single suited hand in clubs
e. Bid 3♦ with 10-13 HCP, guaranteed support for a 6-card major, as game invitational
f. Bid to the appropriate level with any single suited hand that is useless outside of the suit bid
g. Bid 3NT with 14-15 HCP, suit length and HCP concentrated in the minors
All these types of bids are saying something about your hand and govern how the auction will continue depending on the actual hand pattern opened.
3. 6-4 holdings in the majors, 10-15 HCP are rare. 4441 holdings with 16+ HCP are rare. 5-5 holdings in the minors, 14-21 HCP are rare. Natural weak-two’s in ♦ are more frequent. By lumping them all into one bid allows my side to reveal them all adequately in the continuation bidding, having taken away the whole of level-1 and 40% of level-2 from the opponents. I rate that as a big plus.
4. The defence to the bid will be heavily focused towards a natural weak-two ♦ suit having been opened. Never underestimate the annoying factor of a natural weak 2, annoying to the opponents, that is. These forums have plenty of actual hands where someone was faced with an awkward bid after a 2♦ opening.
5. After a takeout double in the direct seat, partner is no longer under any obligation to enter the auction. He may well be sitting with real values opposite a natural weak 2♦ waiting to see how the auction develops before extracting a juicy penalty double for our side?
6. The bid has ♦ as the anchor suit, and should therefore pass brown sticker regulations with flying colours. Even in the ACBL it should be declared legal. Compare that to all the ACBL fuss around the Multi!
The number of gains my side is going to achieve because of all the above, is going to outweigh your 1-in-6 ratio by a considerable margin.
First of all, in standard bidding, 1D-1M-3C is GF, so your weaker minor hands are a level higher with less information. As for your points:
1. About consuming space, you lose a lot of the effect by using a forcing opening. A NF opening does put a lot of pressure on the opposition, but a forcing opening relieves the pressure on the opponents by about a full level. So your 2D opening is really only about the same pressure as a standard 1D opener.
2a) 4th seat is really not under a lot of pressure at all, they will have seen partner pass, and will likely have an easy bid or pass. A simple takeout double will solve itself out, and the opponents are in familiar territory, and in fact, the pressure is reversed as now opener sitting with a 6-4 major hand has to decide whether to rescue partner or bid their 6 card major and risk playing in a 6-0 fit doubled.
b) At this point, the defense should be effectively defending as if against a good weak 2, this can be mildly annoying, but the opposition should be ok most of the time, especially knowing that opener will bid again without length in the major.
c) The defense can pretty much just always pass here, knowing that they will always get another chance to bid if opener has minors, and they are in a misfit with the majors and the majority of the points.
d) I suspect you won't be able to untangle where you belong well enough, this will turn very random, I do concede that defending this development will be difficult if 2nd seat has passed. If 2nd seat has acted though, it becomes about the same. Bear in mind, that it is very unlikely the opponents will play in openers 6 card suit.
e) Here, you are losing any time opener does not have both majors, since you have no way to bid constructively to decide whether or not 3NT is a good idea, something quite important when the alternative is the minors. However the simple defense of X being a takeout of diamonds just turns the auction into defending against 2D-3D, with a little less focus on game.
f) The problem here is you have no idea what the appropriate level is, not does it make it any harder for the defense.
g) So, does opener pull with the majors? How do you bid Jxxx AKJxxx Qx x opposite x Qxx AJTxx AKxx? 6H isn't a terrible contract (better than the slams you've posted in this thread), and 3NT could be down the first 5 spade tricks. If opener pulls, then partner could have the same hand with the minors reversed and 4H will need some luck to make, not to mention it could easily get doubled.
3. 6-4 in the majors isn't that rare when compared to a weak 2 in diamonds, yes it's more rare, but only by about 4x the amount. You are also losing against those who just play a weak 2 in diamonds since the opponents in the vast majority of cases will get 2 chances to act, which can lead to some pretty interesting sequences, some of which would never have been available if 2D is usually passed.
4. A
non-forcing weak 2 is annoying, a forcing one isn't. There is a reason playing transfer pre-empts is generally a bad idea. Like transfer pre-empts it will probably be a decent idea against muppets, but against good opposition you will just get taken to the cleaners. If you assume opener has a weak 2, and you have the nightmare 2425 hand with opening values, you are stuck against a normal weak 2 in diamonds, but against your opening, they can simply pass and the most likely continuation by far will be 2D-P-2S-P-3D, now it is a lot safer to come in knowing that the odds that partner has spades has decreased.
5. And this is different from any other opening bid because.....? In fact, you may even be worse off if it goes say 2D-X-P-3S, opener can't really double or bid 4H with 6H4S, and so you are at a completely blind guess.
6. It's not the diamonds option that makes it a BSC, or the majors option for that matter, but both together make it a BSC, since if having a weak hand of any nature is possible, then whatever non-weak options you have must promise a strong hand (13+ HCP by the WBF description). When it comes to the ACBL, you would have to ask them, since they have some pretty fickle regulations. I seem to remember reading on the forums once that 2H Ekrens (weak with both majors) was allowed (maybe it was only at midchart), but 2D showing the same thing wasn't, despite the almost universal opinion that the former is a lot harder to defend against. However, the ACBL's rule of thumb is a convention is barred unless it is specifically allowed, so at least until you ask for a formal ruling on this, you wouldn't be able to.