[mike777]

In your style how do you force to game after:

1D=1H or 1S
2D=?
With your various gf responder hands?

[mikeh]

After 1D 1H 2D you do have an artificial 2S available, if you’ve discussed this with partner. This is fake because opener has denied 4 spades so you needn’t fear a raise.

After 1D 1S 2D, it’s up to partnership agreement. This is a very under-discussed area in standard bidding. I’m not suggesting this treatment but at one point I played, in my most detailed partnership,2H as an artificial one round force and 2N as showing 4+ hearts, forcing….3H would be 5=5 majors, invite.

Imo, it’s hugely beneficial to avoid having to bid an artificial 3C over 2D, if only because you won’t be able to show a diamond force below 3N.

Btw, this is a good scenario in which to respond 2C with 4=4 blacks and gf values. You shouldn’t ever miss a spade fit and you’ve created a fairly easy gf auction. You could extend that to 4=4 hearts and c,ubs, but I prefer to respond 1H to allow opener to bid 1S if he has shape and spades.

[jdiana]

I think people should just be forbidden from bidding the same suit twice in a row.

[DavidKok]

I play 1♦-1♠; 2♦-2♥ as an artificial game force, neither promising nor denying hearts. A jump to 3♥ instead would have been invitational 5-5. This means that, awkwardly, there is no invite with 5-4 majors (though you could well use 2NT for this as mikeh suggests).

In my most detailed set of agreements in a standard opening system I play Gazzilli after an unbalanced 1♦. As a result, the 1♦-1♠; 2♦ shows 10-15 points, 2(-)♠, 4♥ and 5(+)♦ or 1=4=4=4. Over this 2♥ is to play and 3♣ is 4SGF. This seems like it loses space, but the much more narrowly defined description of opener's hand puts us ahead.

If opener instead has 6(+)♦ without 4♥ the auction is 1♦-1♠; 1NT*-2♣*; 2♦ showing 10-15, 2(-)♠, 3(-)♥ and 6(+)♦. Over this I play 2♥ 3SGF - notice that opener has denied four hearts as well as three spades, so there is not that much of a need to untangle the major suit length. Instead this is often a prelude to a diamond slam try.

[nullve]

nullve-nullve play:

Spoiler

1♦(1)-1♥(2); 1N(3)-2♣(4); 2♦(5)-2♥ = 5+ H, NF
1♦(1)-1♥(2); 1N(3)-2♣(4); 2♦(5)-2N = GF relay
1♦(1)-1♥(2); 2♦(6)-2♥ = 5+ H, NF
1♦(1)-1♥(2); 2♦(6)-2N = GF relay
1♦(1)-1♠(2'); 1N(3')-2♣(4'); 2♦(5')-2♠ = GF relay
1♦(1)-1♠(2'); 2♦(6')-2♠ = GF relay

(1) "10+", NATish unBAL OR 20-22 BAL (this in a 2/1-like system with T-Walsh)
(2) "spades". Longer hearts possible unless GF values
(2') "hearts". Spade suit not possible unless GF values
(3) Gazzilli-like: a) 9-14, 5D5C2-S b) "10-12", 6+D2-S3-H c) "16-18", any without hearts d) 20-22 BAL
(3') Gazzilli-like: a') 9-14, 5D5C2-H b') "10-12", 6+D2-H c') "16-18", any d') 20-22 BAL
(4) relay, GF opposite c) and d)
(4') relay, GF opposite c') and d')
(5) b)
(5') b')
(6) "13-15", otherwise like b)
(6') "13-15", otherwise like b')

[jdiana]

Undiscussed, I would have thought that a new suit bid by responder after 1D - 1H/1S - 2D is exploring for notrump, showing a stopper in the suit bid and forcing for one round (at least). Responder could pass if opener bids diamonds again.

We don't have a GF bid in that situation, so we would bid a new suit (F1) in any event to keep the conversation going. TBH, I hadn't really thought about whether 1D - 1H - 2D - 2S is a responder reverse (i.e., GF, which I think we discussed recently in another thread). 3rd suit forcing may be better.

[mikeh]

DavidKok, on 2024-November-09, 02:44, said:

I play 1♦-1♠; 2♦-2♥ as an artificial game force, neither promising nor denying hearts. A jump to 3♥ instead would have been invitational 5-5. This means that, awkwardly, there is no invite with 5-4 majors (though you could well use 2NT for this as mikeh suggests).

In my most detailed set of agreements in a standard opening system I play Gazzilli after an unbalanced 1♦. As a result, the 1♦-1♠; 2♦ shows 10-15 points, 2(-)♠, 4♥ and 5(+)♦ or 1=4=4=4. Over this 2♥ is to play and 3♣ is 4SGF. This seems like it loses space, but the much more narrowly defined description of opener's hand puts us ahead.

If opener instead has 6(+)♦ without 4♥ the auction is 1♦-1♠; 1NT*-2♣*; 2♦ showing 10-15, 2(-)♠, 3(-)♥ and 6(+)♦. Over this I play 2♥ 3SGF - notice that opener has denied four hearts as well as three spades, so there is not that much of a need to untangle the major suit length. Instead this is often a prelude to a diamond slam try.

Our structure over 1D 1M, where 1D is unbalanced (may be 5422 or 6322 as the most balanced possibilities) is:

1D 1H 1S. 4 spades

1D 1H 1N. Clubs

1D 1H 2C. 6+ diamonds, at most 2H

1D 1H 2D. 5+ diamonds, 3 card heart support

1D 1H 2H. 4 card support

2N rebid is gf with ,one diamonds, usually denies 3 hearts

3D rebid is strong but nf.

We’ve only been playing this for a month…it came up a few times in BA but nothing really turned on it, other than that I got to jump to a game after 1D 1H 2D without giving away any information…a slower auction might have led to a more effective lead but only overtricks were at stake.

[DavidKok]

I know transfer rebids are popular on the unbalanced diamond start and 1M response. I prefer the Gazzilli option. On 1♦-1♥ it looks like:

• 1♠: 4(+) spades
  
• 1NT: 16(+) without 4 hearts and without 4 spades, or (10)11-15 6(+)♦ without 4 hearts and without 3 spades.
  
• 2♣: 11-15 5(+)♦4(+)♣.
  
• 2♦: 11-15 6(+)♦3♥ - optionally you can decide that 3-card support takes preference to showing a side 4-card suit, in which case this becomes 5(+)♦. Of course unbalanced hands with 5 diamonds and 3 hearts must be 5431 or 0=3=5=5. Personally I would bid spades and then pull to hearts with 4=3=5=1 but with 1=3=5=4 I prefer to raise.
  
• 2♥: 11-13, 4-card support.
  
• 2♠: Stronger than 1♠, optionally leave this idle or for something artificial.
  
• 2NT: 16(+) 4-card heart raise.
  
• 3♣: 13-15 5-5 minors.
  
• 3♦: 13-15, 6(+)♦, 3♥.
  
• 3♥: 14-15, 4-card heart raise.

There is room to add specific splinters and differentiate a slow strong raise (via 2NT) from a direct one (3♠+) and even 1NT-then-jump is available, but this set alone covered most of what I wanted. Notice that the BW Death Hand and its cousin without 3-card support go via 1NT, so we don't need to reserve immediate jump bids for those.

1♦-1♠; ? is similar except now 2♦ shows 2(-)♠4♥5(+)♦.

[nullve]

DavidKok, on 2024-November-09, 11:13, said:

I know transfer rebids are popular on the unbalanced diamond start and 1M response. I prefer the Gazzilli option. On 1♦-1♥ it looks like:

• 1♠: 4(+) spades
  
• 1NT: 16(+) without 4 hearts and without 4 spades, or (10)11-15 6(+)♦ without 4 hearts and without 3 spades.
  
• 2♣: 11-15 5(+)♦4(+)♣.
  
• 2♦: 11-15 6(+)♦3♥ - optionally you can decide that 3-card support takes preference to showing a side 4-card suit, in which case this becomes 5(+)♦. Of course unbalanced hands with 5 diamonds and 3 hearts must be 5431 or 0=3=5=5. Personally I would bid spades and then pull to hearts with 4=3=5=1 but with 1=3=5=4 I prefer to raise.
  
• 2♥: 11-13, 4-card support.
  
• 2♠: Stronger than 1♠, optionally leave this idle or for something artificial.
  
• 2NT: 16(+) 4-card heart raise.
  
• 3♣: 13-15 5-5 minors.
  
• 3♦: 13-15, 6(+)♦, 3♥.
  
• 3♥: 14-15, 4-card heart raise.

There is room to add specific splinters and differentiate a slow strong raise (via 2NT) from a direct one (3♠+) and even 1NT-then-jump is available, but this set alone covered most of what I wanted. Notice that the BW Death Hand and its cousin without 3-card support go via 1NT, so we don't need to reserve immediate jump bids for those.

1♦-1♠; ? is similar except now 2♦ shows 2(-)♠4♥5(+)♦.

Seems like 1♦-1♥; 3♦ is a subset of 1♦-1♥; 2♦.