I would bid 3NT without the BIT. And I would think that 3
♦ is an LA.
What partner's BIT suggests obviously depends on the system. But it will typically suggest one of these 3 types of hands:
- a penalty pass (not very likely given our heart holding, but certainly possible, depending on West's "overcall style")
- a hand that is not good enough to bid 2♣
- a hand that wants to bid 1NT, but lacks a heart stop
In all three cases, we will normally get to 3NT whether I will bid 3NT or 3
♦. If partner has a penalty pass, he will bid 3NT over my 3
♦. If partner has one of the other two hands, he will ask whether I have a heart stop and I will bid 3NT. So, the difference between bidding 3
♦ and 3NT is that after 3
♦ partner will be declarer if he has a penalty pass.
So, the question is reduced to:
If partner has a penalty pass, is it better to play 3NT from my hand (I bid 3NT) then from partner's hand (I bid 3
♦)?
Usually, it is better to put the overcaller on lead. That means that 3NT is demonstrably suggested over 3
♦.
So, without the BIT I will bid 3NT and with the BIT I will bid 3
♦.
Rik
I want my opponents to leave my table with a smile on their face and without matchpoints on their score card - in that order.
The most exciting phrase to hear in science, the one that heralds the new discoveries, is not “Eureka!” (I found it!), but “That’s funny…” – Isaac Asimov
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