[cencio]

bid this hand

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I
I tried some software to see how they declared it.
Strangely, one in the north passed,
And one in the south after 1c at the opening replied 1D
Is it a particular agreement?

[jillybean]

North has an opening hand but a difficult rebid after 1C 1H
South bidding 1D/1C is using a convention I have never heard of.

After partner opens 1C, South's hand is perfect use of inverted minor 1C:2C to show invitational or better hand with clubs.
If you only have SAYC, and no GF raise in a minor, you have to create/psyche a bid, perhaps this is what the 1D bidder was doing.

I'm happy playing 12-14NT with North's hand. Playing 15-17, how do others bid this?

[pescetom]

Playing 15-17 and 2/1 GF, North can either open 1C or Pass, according to style. She has an easy 1NT rebid after a 1H response, IMO.

If South has no GF clubs "raise", then he could do a lot worse than just responding 6NT with this hand. North's 12+ points certainly aren't in the black suits.

[jillybean]

 pescetom, on 2024-September-02, 06:41, said:

Playing 15-17 and 2/1 GF, North can either open 1C or Pass, according to style. She has an easy 1NT rebid after a 1H response, IMO.

If South has no GF clubs "raise", then he could do a lot worse than just responding 6NT with this hand. North's 12+ points certainly aren't in the black suits.

Having a 3334 hand with ♠xxx I really dislike bidding 1nt after 1C 1H.
I much happier opening 12-14 nt with these hands.

[blackshoe]

North was dealer? Precision:

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If South is dealer:

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Playing 2/1 GF, North dealer:

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South dealer:

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If North deals and does not pass:

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There are other possibilities.

[AL78]

In UK weak NT land, North opens 1NT, South bids 4NT quantitative, North passes.

[Zelandakh]

cencio, on 2024-September-01, 10:21, said:

I tried some software to see how they declared it.
Strangely, one in the north passed,

It is perfectly acceptable to downgrade this rather featureless 12 count to a Pass if that is your partnership style and some systems even demand it.

cencio, on 2024-September-01, 10:21, said:

And one in the south after 1c at the opening replied 1D
Is it a particular agreement?

I would assume for this that you had Inverted Minors and Criss-Cross switched off as bidding options. In this case, there is essentially no bid available to show a game-forcing club raise and bidding a major would promise at least 4. So bidding the other minor even when short is the emergency out. It is quite a well-known trick from yesteryear that you could call a particular agreement if you so choose.

cencio, on 2024-September-01, 10:21, said:

bid this hand

I suspect I would reach 6♣ here, which is down on best defence (and might be down off the top on the auction) but has its chances. Something like:

1NT = (11)12-14 balanced or 4=4=1=4
... - 2♣ = 4/5 card major ask
2♦ = no 5 card major
... - 2♥ = spade ask, denies interest in 4-4 heart fit
2NT = <4 spades, min
... - 3♣ = nat, SI
4♣ = nat
... - 6♣

I think the Strong NTers almost certainly get a better auction here and will be able to bid/avoid the slam with much greater precision.

[pescetom]

We too would risk a walk on the wild side of clubs:
1♣ (2+) - 2♣ (FG, maybe not clubs)
2N - 3♣
3N - 4♣
4♦ (CTL) - 4♥ (CTL)
5♣ (!CTL♠, odd keycards) - P (at least at MP)

It's arguable that 5NT after 5♣ should be a natural sign-off rather than a paradoxical concern about the Q for the grand, but this is not discussed.