FrancesHinden, on 2010-December-21, 16:39, said:
The point is that, unless you play some sort of methods then in 2/1 opener has given responder no information about the strength of their hand in the auction 1S - 2H - 3H: opener can have anything from a subminimum to a huge hand, and responder can have anything from a game force to a slam force. This is an acknowledged problem with 2/1, that neither hand ever gets to limit itself.
By contrast, the Acol sequence starting 1S - 2H - 3H is actually better for this specific sequence, because while responder's hand is wide range, opener is now very limited: a minimum opening bid, usually with only 3-card heart support (most hands with 4 hearts will just bid game and get on with it unless really horrible). If responder does anything other than pass or bid 4H he's now shown a slam try opposite a minimum. This gives him the chance to use 3NT to distinguish e.g. between balanced slam tries and long suit trial bids, because he doesn't need a serious/frivolous 3NT bid: moving at all must be serious as opener is limited.
I don't get it: 1S - 2H - 3H appears, if I read you correctly, to be non-forcing. I can see that this narrowly defines opener's hand and this may be useful when responder has a hand that otherwise had mild slam interest.
But the corollary seems to be that opener is truly screwed (as is his partner) when he has substantial extras. Absent artificiality in response to 2
♥ (and all artificiality comes with a cost...you lose or at least complicate the natural meaning of the calls devoted to artificialty), how can opener distinguish between the 5=4=2=2 hands just a tad too strong for the nf 3
♥ and the 16-18 count 5=4=2=2 hands with strong slam interest?
So your style gains when responder has significant extras but not enough to look for slam opposite a horrible opener, while 2/1 gains whenever opener has any extras at all....by preserving an entire level of bidding space (not to mention keeping available a virtually cost-free call of 3N as artificial...this is an artificiality that carries with it almost no intrinsic downside...how often are we going to want to play 3N?).
My point is that those who knock 2/1 as a basic approach never seem to me to offer alternatives that lack similar and usually just as bad or worse difficulties. But that may be my chauvinism showing.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari