LBengtsson, on 2023-March-22, 10:47, said:
If you decide not to open 2NT with the West cards, and many would go the route of opening at the one level with 1♦, then rebidding 2♦ is just a poor bid imo - you asked for advice, so I am going to say it as it is.
The reason why I say 2♦ is a poor rebid is:-
1. It is not a 6+ card suit
2. You are indicating (usually) a minimum hand - maybe in your 2/1 methods you want to save space, so you can bid 2♦ here.
3. You are not looking for a major suit fit: if partner had 5M he would have bid it at the one level instead of 2♣ surely?
4. You have no 4M to show, so no 4M/4M fit to find.
5. The hand is balanced, and to protect the ♥Kx you will need to be declarer.
So here you need 2NT to show the shape, but not necessarily the point range here. After this I think it is easy to get to 6NT played from your side, although 6♣ is a better and alternative contract, but you should still get there imo. Partner rebids 3♣ after 2NT to show a 6 card suit, and with 19 HCPs and good controls opposite minimum of 12, I really cannot see how the field played in 3NT.
I admit it is always easier to judge a possible contract seeing the two hands that are bidding, but there is a certain logic having a 2NT rebid as extras or minimum here on this sequence. I also admit am not a 2/1 expert, like Stephen Tu who writes on these forums, but I have seen this 2NT rebid made on both types of hand, 12-14 minimum and 18-19 balanced also.
I do agree that 2N would have been a better bid. After reading the Larry Cohen article on this issue, he says that 2N could either be a minimum hand or an 18-19 point hand, so it really does not give much info to partner on strength. Neither did my bid. I agree that it is better if I am the declarer because of the K doubleton of hearts. As it turned out, according to double dummy - 6NT does not make. So, we either have to play 3N or play 6clubs. And if we are in clubs, partner is always the declarer leaving me with the heart lead issue.
I rebid the diamonds to see if partner might have clubs and diamonds, and I am not worried about a pass since we are in a forcing auction.
If I were bidding it today, I would have bid 2N - then depending on what partner did - we might wind up at 3N or possibly 4N. Still having a problem getting to 6C.
I appreciate the analysis. I looked at the hand again this morning to see if I could determine from the bidding that partner had the Q of hearts based on points, and I still cannot get there. Any help is appreciated.