[thepossum]

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At this point I could choose (I thought) between 3H or 3D as continuation
3D being stronger than 3H obviously

After bidding 3D West starts to compete (via a double) and you end up in a more costly contract
After bidding 3H West passes and you are in the least costly contract

It seems back to front logic. Just unlucky perhaps

Was 3D wrong with that hand?

[helene_t]

I have seen similar things and I am afraid I can't explain it.

Maybe west has diamonds and doubles 3di for that reason?

A logical explanation would be that west can't compete over 3ha because bidding over a nonconstructive call is constructive? But I don't think gib thinks that way.

So I just write it off as random gibberish.

You have a nice hand but spade Qx should be devalued. Anyway, whether it is the right bid depends on whether you want north to accept with a max and/or a diamond fit or whether you just want to compete. If p has ♦Kx and four small trumps, 4♥ is good even if they have only those 3 HCPs, so probably 3♦ is good.

[gszes]

thepossum, on 2022-November-01, 21:12, said:

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At this point I could choose (I thought) between 3H or 3D as continuation
3D being stronger than 3H obviously

After bidding 3D West starts to compete (via a double) and you end up in a more costly contract
After bidding 3H West passes and you are in the least costly contract

It seems back to front logic. Just unlucky perhaps

Was 3D wrong with that hand?

if you are playing with a human 3d seems fine because it focuses their attention on the dia suit. GIB just blatantly ignores that and seems to raise almost any time they are not near dead minimum. opposite a robot, i would just bid 3h and make it tougher on the defense (no dia knowledge) and be willing to miss the occasional game.

[pescetom]

gszes, on 2022-November-02, 21:39, said:

if you are playing with a human 3d seems fine because it focuses their attention on the dia suit.

A slight overbid IMHO.
I would be happier bidding 4♥ given the hand and vulnerability.