awm, on 2024-February-27, 01:51, said:
There are two main reasons why people put the 5M-332 hands into 1♦:
Even if you do put the 5M-332 hands into 1♦, I don't think it makes sense to respond to 1♦ with three-card majors. Yes, this helps you find the 5-3 fit when opener has 5M-332, but it's far more common that opener has some (4432) or (4333) hand where responding in this way makes it hard to locate your 4-4 major fits (or forces you to play a lot of 4-3 major fits).
You are probably right; (this was never an issue in MICS).....Just thinking, and not too deeply, and assuming Responder is weak , say 6 -9/10
Case I The weak 5M332 is thrown into the 1D bid ... I open 1D and you respond with 1M (showing 3+)....I raise to show you found my weak 5M332 hand else I bid 1NT showing weak 4432 or 4333 or 5332 but not 5 or your 3 card Major...(assuming I have a weak balanced hand and not a Diamond suit)....So, we may end up playing 1NT , having a 4-4 Major fit.
Case 2 The weak 5M332 is not thrown in the 1D bid. So then the bidding goes : 1D - 1M -( showing 4+) - and then I either bid 1NT or raise your Major if I too have 4 cards in your major
So it seems like some of the difference between Case I and Case II are :
1) at times in Case I, you may be playing 1NT with a 4-4 Major fit when in Case II you would be playing 2M , where in both cases the opponents probably have more HCP than your partnership does.
2) Case I can result in a different score than most of the other pairs playing in the room - might be a good board or a bad board. Need someone to run the simulation!
3) Case I seems to have the advantage of giving more clarity to what the opening of 1M means seeing as it must be 6+ in the suit or a 2 suited 5+/4+ hand.
4) In Case II, Opener may end up rebidding a short suit with a weak 5M332 hand, whilst Responder doesn't know if it is a 2 or 3 card suit or 4+
Not really seeing where you end up playing a 4-3 fit, though