[foobar]

Do folks have any recommendations for a response structure over an intermediate 2♦ opening (say 11-15ish) with no 4CM, but possibly 4+♣? In case it's relevant, 5♣-5♦ hands are opened with 2♣.

It's possible to play 2♥ as a symmetric relay with a +1 shape resolution, but it seems really cramped, and it's tough to try and fit in the invite hands over it.

[DavidKok]

A simple approach is as follows:

• 2♥: 8-11 5(+)♥ invitational nf.
  
• 2♠: 8-11 5(+)♠ invitational nf.
  
• 2NT: 10+ generic asking bid, range and feature/shortage responses (your choice).
  
• 3♣: 8-11 (5)6(+)♣ invitational nf.
  
• 3♦: 5-9 3(+)♦ competitive raise.
  
• 3♥: GF 6(+)♥.
  
• 3♠: GF 6(+)♠.
  
• 3NT: to play.

Alternatively you could play the jumps to 3M as splinter raises, but since 2♦ denies a 4cM this is likely rare and also places opener in an awkward position.
It would also make sense to give up on the 3♣ invite and just make it forcing to game or use it as a second artificial asking bid, but I'm keeping it simple for now.

[awm]

I've never found invitational NF bids that show 5+ in a suit to be particularly playable. The issue is that partner needs to bid with any maximum, or with shortness in the bid suit, or with length in the bid suit. So you only get to pass with exactly doubleton and minimum, which is quite a narrow target (especially when opener advertises an unbalanced hand). If you're almost never passing anyway, it seems better to play new suits forcing (or some kind of transfer or relay method). Here, I'd go with something like:

2♥ = spades (any strength, but 6+♠ if weak) or any exactly invitational without 5+♥ or a diamond fit
2♠ = 5+♥ and invitational or better
2NT = game forcing asking bid
3♣ = invitational or better diamond raise
3♦ = blocking
3M = natural and game forcing, setting the suit
3NT = to play

After 2♦-2♥:
... 2♠ = 0-2♠
... 2NT = 3♠ and minimum
... 3♣ = 3154 or similar, maximum
... 3♦ = 3622 maximum
... 3♥ = 3361 or similar, maximum
... 3♠ = 3163 or similar, maximum

After 2♦-2♥-2♠:
... Pass = 6+♠ not very strong
... 2NT/3♣ = natural invite, nothing about spades
... 3♦ = 5♠ and 3+♦, invite, NF
... 3♥ = 5+/5+ majors invitational
... 3♠ = long/good spades, invitational
... 3NT = to play (presumably 5♠)
... 4♣ = big two suiter (♠+♣), forcing
... 4♦ = spades and diamonds and GF
... 4♥ = 5+/5+ majors, GF
... 4♠ = to play

After 2♦-2♠:
... 2NT = minimum, at most two small hearts
... 3♣ = maximum, natural, not three hearts
... 3♦ = maximum, 6+♦, not three hearts
... 3♥ = minimum with Hx or better hearts
... 3♠ = maximum with Hx exactly in hearts (choice of game)
... 3NT = maximum, at most two small hearts
... 4m = cue for hearts with a maximum and 3♥

After 2♦-2NT:
... 3♣ = 4♣ (3♦ asks shortness)
... 3♦ = 6+♦ short clubs
... 3M = 6+♦ short in the bid suit
... 3NT = 6♦ semi-balanced

[foobar]

awm, on 2026-January-02, 04:26, said:

I've never found invitational NF bids that show 5+ in a suit to be particularly playable. The issue is that partner needs to bid with any maximum, or with shortness in the bid suit, or with length in the bid suit. So you only get to pass with exactly doubleton and minimum, which is quite a narrow target (especially when opener advertises an unbalanced hand). If you're almost never passing anyway, it seems better to play new suits forcing (or some kind of transfer or relay method). Here, I'd go with something like:

2♥ = spades (any strength, but 6+♠ if weak) or any exactly invitational without 5+♥ or a diamond fit
2♠ = 5+♥ and invitational or better
2NT = game forcing asking bid
3♣ = invitational or better diamond raise
3♦ = blocking
3M = natural and game forcing, setting the suit
3NT = to play

...

After 2♦-2NT:
... 3♣ = 4♣ (3♦ asks shortness)
... 3♦ = 6+♦ short clubs
... 3M = 6+♦ short in the bid suit
... 3NT = 6♦ semi-balanced

This seems reasonable, but does it make it difficult to know whether to explore slam with minor oriented hands over 2♦ - 2N? For example, the sequence 2♦ - 2N - 3N doesn't let leave any room to know whether it's OK to go on. Perhaps, it's best to just use 2♥
as any invite+ and 2N as 5+ ♠ invite (giving up on stopping in 2♠). Another option might be 2♥ as any GF OR invitational with 5+♠.

On an different note, what scheme would you suggest over a similar 2♣ opening? In that case, using 2♦ as invite+ relay seems obvious, and the situation is similar to IMPrecision, except that it needs to handle the LL shape in the minors.