You make a good case for Landy. The multi version gets more complicated. Steve Robinson devotes 11 pages to Multi-Landy in
Washington Standard. I think the basic problem, in any intervention over 1NT, is that there might not be a fit anywhere so agreements have to be good enough to survive. You and your partner have 26 cards so there might be two 7 card fits and two 6 card fits, or even three 7 card fits and one 5 card fit. In such circumstances we want to land in a 7 card fit. And we want to do this while still looking for an 8 card fit if there is one.
It would be useful and interesting (to me) to have a thread where various hands from play involving intervention over 1NT are presented, both when the intervention worked and when it didn't.
An example (I think it's a fairly standard Landy agreement) from Robinson: (1NT) - 2
- (Pass) -? Suppose fourth hand has one
and three
. He bids 2
, pass or correct. Probably the 2
bidder has
, presumably 6+ for his one suited intervention over 1NT, and he happily passes 2
. Fine. If, instead, the 2
bidder has
, unlikely but possible, he corrects to 3
which should be a fine contract with three card
support and a stiff
. This makes sense, but I wouldn't try it without previous discussion.
Often I like to simply play natural overcalls of 1NT. It's not that I think it is great, I don't, but at least we are unlikely to get confused as to what means what. For example, playing DONT the auction (1NT) - 2
DONT - (Pass) - 2
asks for overcaller's second suit. However I think that (1NT) - 2
DONT - (X) - 2
shows
, while (1NT) - 2
- (X) - XX asks for overcaller's other suit. This is workable, but only if both partners are on the same page. Misunderstandings are a frequent problem in IAC and elsewhere. Donna was speaking about this in her session yesterday and I completely agree.
At any rate, I like the example that you present and I think a string of examples could be very useful.
Added: I was browsing and found
https://s3.amazonaws.com/cdn.baronbarclay.com/downloads/book_samples/5516.pdfThis shows the first 20+ pages of a 220+ page book on Multi-Landy.
A bit much!
But it should be possible to get the essence in not too many pages.